<SEC-DOCUMENT>0001104659-24-035176.txt : 20240318
<SEC-HEADER>0001104659-24-035176.hdr.sgml : 20240318
<ACCEPTANCE-DATETIME>20240318060557
ACCESSION NUMBER:		0001104659-24-035176
CONFORMED SUBMISSION TYPE:	424B5
PUBLIC DOCUMENT COUNT:		4
FILED AS OF DATE:		20240318
DATE AS OF CHANGE:		20240318

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ClearSign Technologies Corp
		CENTRAL INDEX KEY:			0001434524
		STANDARD INDUSTRIAL CLASSIFICATION:	INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL [3823]
		ORGANIZATION NAME:           	08 Industrial Applications and Services
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		424B5
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-265967
		FILM NUMBER:		24756833

	BUSINESS ADDRESS:	
		STREET 1:		8023 E. 63RD PLACE, SUITE 101
		CITY:			TULSA
		STATE:			OK
		ZIP:			74133
		BUSINESS PHONE:		(918) 236-6461

	MAIL ADDRESS:	
		STREET 1:		8023 E. 63RD PLACE, SUITE 101
		CITY:			TULSA
		STATE:			OK
		ZIP:			74133

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CLEARSIGN COMBUSTION CORP
		DATE OF NAME CHANGE:	20080507
</SEC-HEADER>
<DOCUMENT>
<TYPE>424B5
<SEQUENCE>1
<FILENAME>tm249031d1_424b5.htm
<DESCRIPTION>424B5
<TEXT>
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<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><B>Filed Pursuant to Rule&nbsp;424(b)(5)</B></P>

<P STYLE="text-align: right; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Registration No.&nbsp;333-265967</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: left; color: red"><B>The information in this preliminary
prospectus supplement is not complete and may be changed. Neither this preliminary prospectus supplement nor the accompanying prospectus
is an offer to sell these securities, and we are not soliciting an offer to buy these securities, in any jurisdiction where the offer
or sale is not permitted.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; color: red"><B>SUBJECT TO COMPLETION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; color: red"><B>PRELIMINARY PROSPECTUS SUPPLEMENT,
DATED MARCH&nbsp;18, 2024</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>PROSPECTUS SUPPLEMENT</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(To Prospectus Dated August&nbsp;12, 2022)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><IMG SRC="tm249031d1_424b5img01.jpg" ALT="" STYLE="height: 56px; width: 242px"></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Shares of Common Stock
and</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Redeemable Warrants to Purchase up to&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Shares of Common Stock</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
are offering&nbsp;&nbsp;</FONT><B>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</B>shares of
our common stock and&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;redeemable warrants (the &ldquo;warrants&rdquo;) to
purchase up to&nbsp;&nbsp;<B>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</B>shares of our
common stock pursuant to this prospectus supplement and accompanying prospectus. The warrants are being offered and sold at the rate
of one warrant for every three shares of common stock purchased in this offering. The shares of common stock and warrants are being
offered separately and not as a unit, but we expect that the underwriter will allocate purchases by investors in lots comprised of
multiples of three shares of common stock and one warrant. The proposed public offering price per one share of common stock is $1.05
and the proposed public offering price per one accompanying warrant will be $0.01. The final public offering prices of the
securities will be determined through negotiation between us and the underwriters in the offering and may be at a different public
offering prices than the current proposed public offering prices. Each warrant will have an exercise price of
$&nbsp;&nbsp;<B>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</B>per share of common stock
and will be immediately exercisable on the date of issuance. The warrants will expire five years after the date of issuance and
are redeemable by us, subject to certain market based criteria. See
 &ldquo;Description of Securities We Are Offering&rdquo; in this prospectus supplement for additional information. We are also
registering the offer and sale of an aggregate of up
to&nbsp;&nbsp;<B>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </B>shares of our common stock
issuable from time to time upon the exercise of the warrants. The warrants will be issued in book-entry form pursuant to a warrant
agency agreement between us and VStock Transfer, LLC as warrant agent (the &ldquo;Warrant Agent&rdquo;).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
common stock is traded on the Nasdaq Capital Market under the symbol &ldquo;CLIR&rdquo;. The last reported sale price of our common stock
on March&nbsp;</FONT>15, 2024 was $0.98 per share. There is no established public trading market for the warrants, and we do not expect
a market to develop. We do not intend to apply for listing of the warrants on any securities exchange or other nationally recognized trading
system. Without an active trading market, the liquidity of the warrants will be limited.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">As
of March&nbsp;</FONT>18, 2024, the aggregate market value of our outstanding common stock held by non-affiliates, or the public float,
was $41,247,939, which was calculated based on 32,224,952 shares of our outstanding common stock held by non-affiliates at a price of $1.28
per share, the closing price of our common stock on February&nbsp;29, 2024. Pursuant to General Instruction I.B.6 of Form&nbsp;S-3, in
no event will we sell shares pursuant to this prospectus with a value of more than one-third of the aggregate market value of our common
stock held by non-affiliates in any 12-month period, so long as the aggregate market value of our common stock held by non-affiliates
is less than $75,000,000. During the 12-calendar month period that ends on, and includes, the date of this prospectus supplement, we have
not sold any securities pursuant to General Instruction I.B.6. of Form&nbsp;S-3.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Investing
in these securities involves a high degree of risk. Before buying shares of our common stock or warrants to purchase our common stock,
you should carefully consider the risk factors described in &ldquo;Risk Factors&rdquo; beginning on page&nbsp;</B></FONT><B>S-10</B>
<B>of this prospectus supplement and in the risks discussed under similar headings in the documents incorporated by reference into this
prospectus supplement and the accompanying prospectus, and any free writing prospectus that we have authorized for use in connection
with this offering.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B>Neither the Securities and Exchange Commission
nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement is accurate
or complete. Any representation to the contrary is a criminal offense.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt; text-align: center">&nbsp;</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font: bold 10pt Times New Roman, Times, Serif; text-align: center; border-bottom: Black 1pt solid">Per Share</TD><TD STYLE="padding-bottom: 1pt; font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font: bold 10pt Times New Roman, Times, Serif; text-align: center; border-bottom: Black 1pt solid">Per Warrant</TD><TD STYLE="padding-bottom: 1pt; font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font: bold 10pt Times New Roman, Times, Serif; text-align: center; border-bottom: Black 1pt solid">Total</TD><TD STYLE="padding-bottom: 1pt; font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 61%; font: 10pt Times New Roman, Times, Serif">Public offering price</TD><TD STYLE="width: 1%; font-size: 10pt">&nbsp;</TD>
    <TD STYLE="width: 1%; font-size: 10pt; text-align: left">$</TD><TD STYLE="width: 10%; font-size: 10pt; text-align: right">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD><TD STYLE="width: 1%; font-size: 10pt; text-align: left">&nbsp;</TD><TD STYLE="width: 1%; font-size: 10pt">&nbsp;</TD>
    <TD STYLE="width: 1%; font-size: 10pt; text-align: left">$</TD><TD STYLE="width: 10%; font-size: 10pt; text-align: right">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD><TD STYLE="width: 1%; font-size: 10pt; text-align: left">&nbsp;</TD><TD STYLE="width: 1%; font-size: 10pt">&nbsp;</TD>
    <TD STYLE="width: 1%; font-size: 10pt; text-align: left">$</TD><TD STYLE="width: 10%; font-size: 10pt; text-align: right">&nbsp;&nbsp;&nbsp;&nbsp;</TD><TD STYLE="width: 1%; font-size: 10pt; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Underwriting discounts and commissions<SUP>(1)</SUP></FONT></TD><TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; text-align: left">$</TD><TD STYLE="font-size: 10pt; text-align: right">&nbsp;</TD><TD STYLE="font-size: 10pt; text-align: left">&nbsp;</TD><TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; text-align: left">$</TD><TD STYLE="font-size: 10pt; text-align: right">&nbsp;</TD><TD STYLE="font-size: 10pt; text-align: left">&nbsp;</TD><TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; text-align: left">$</TD><TD STYLE="font-size: 10pt; text-align: right">&nbsp;</TD><TD STYLE="font-size: 10pt; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Proceeds, before expenses, to us<SUP>(2)</SUP></FONT></TD><TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; text-align: left">$</TD><TD STYLE="font-size: 10pt; text-align: right">&nbsp;</TD><TD STYLE="font-size: 10pt; text-align: left">&nbsp;</TD><TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; text-align: left">$</TD><TD STYLE="font-size: 10pt; text-align: right">&nbsp;</TD><TD STYLE="font-size: 10pt; text-align: left">&nbsp;</TD><TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; text-align: left">$</TD><TD STYLE="font-size: 10pt; text-align: right">&nbsp;</TD><TD STYLE="font-size: 10pt; text-align: left">&nbsp;</TD></TR>
  </TABLE>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in">(1)</TD><TD>Does not include the reimbursement of certain expenses of the underwriter we have agreed to pay. We have also granted warrants to
the underwriter in connection with this offering. See the section entitled &ldquo;Underwriting&rdquo; beginning on page&nbsp;S-16
for a description of the compensation payable to the underwriter.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in">(2)</TD><TD>The amount of the offering proceeds to us presented in this table does not give effect to any exercise of the warrants being issued
in this offering.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have granted the underwriter an option for a
period of 45 days to purchase up to an additional&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;of shares of our common stock
or up to an additional of shares of our common stock and accompanying warrants to purchase&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; shares of common stock from us, in
each case, at the price and ratio to the public set forth above, as applicable, and in footnote (1)&nbsp;less the underwriting discount.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The underwriter expects to deliver the shares of
common stock and accompanying warrants against payment on or about&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;,
2024.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><I>Sole Book-Running Manager</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>PUBLIC VENTURES, LLC</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>The date of this prospectus supplement is&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;,
2024.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>TABLE OF CONTENTS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 94%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Prospectus Supplement</B></FONT></TD>
    <TD STYLE="width: 6%; border-bottom: Black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Page</B></FONT></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#prossup_001"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">ABOUT THIS PROSPECTUS</FONT> SUPPLEMENT</A></TD>
    <TD STYLE="text-align: right"><A HREF="#prossup_001"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">S-1</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD><A HREF="#prossup_002"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">MARKET,&nbsp;INDUSTRY AND OTHER DATA</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#prossup_002">S-2</A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#prossup_003"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#prossup_003">S-2</A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD><A HREF="#prossup_004"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">PROSPECTUS</FONT> SUPPLEMENT SUMMARY</A></TD>
    <TD STYLE="text-align: right"><A HREF="#prossup_004">S-3</A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#prossup_005"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">THE OFFERING</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#prossup_005">S-7</A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD><A HREF="#prossup_006"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">RISK FACTORS</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#prossup_006">S-10</A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#a_001"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">USE OF PROCEEDS</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#a_001">S-13</A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD><A HREF="#a_002"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">DESCRIPTION OF SECURITIES WE</FONT> ARE OFFERING</A></TD>
    <TD STYLE="text-align: right"><A HREF="#a_002">S-14</A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#a_003"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">DILUTION</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#a_003">S-15</A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD><A HREF="#a_004"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">UNDERWRITING</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#a_004">S-16</A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#a_005"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">LEGAL MATTERS</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#a_005">S-20</A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD><A HREF="#a_006"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">EXPERTS</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#a_006">S-20</A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#a_007"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">WHERE YOU CAN FIND MORE INFORMATION</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#a_007">S-20</A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD><A HREF="#a_008"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">INFORMATION INCORPORATED BY REFERENCE</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#a_008">S-20</A></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 94%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Prospectus</B></FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; width: 6%; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Page</B></FONT></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#b_001"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">ABOUT THIS PROSPECTUS</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_001"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">1</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD><A HREF="#b_002"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">MARKET,&nbsp;INDUSTRY AND OTHER DATA</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_002"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">1</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#b_003"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_003"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">1</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD><A HREF="#b_004"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">OUR BUSINESS</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_004"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">3</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#b_005"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">RISK FACTORS</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_005"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD><A HREF="#b_006"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">USE OF PROCEEDS</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_006"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#b_007"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">DILUTION</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_007"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD><A HREF="#b_008"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">DESCRIPTION OF SECURITIES THAT MAY&nbsp;BE OFFERED</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_008"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">6</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 0.1in"><A HREF="#b_009"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Description of Debt Securities</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_009"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">6</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 0.1in"><A HREF="#b_010"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Description of Common Stock</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_010"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">13</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 0.1in"><A HREF="#b_011"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Description of Preferred Stock</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_011"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">16</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 0.1in"><A HREF="#b_012"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Description of Warrants</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_012"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">16</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 0.1in"><A HREF="#b_013"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Description of Units</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_013"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">17</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 0.1in"><A HREF="#b_014"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Description of Subscription Rights</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_014"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">18</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#b_015"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">PLAN OF DISTRIBUTION</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_015"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">19</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD><A HREF="#b_016"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">LEGAL MATTERS</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_016"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">21</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#b_017"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">EXPERTS</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_017"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">21</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD><A HREF="#b_018"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">WHERE YOU CAN FIND MORE INFORMATION</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_018"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">22</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#b_019"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">INFORMATION INCORPORATED BY REFERENCE</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_019"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">23</FONT></A></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="prossup_001"></A>ABOUT THIS PROSPECTUS SUPPLEMENT</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">This prospectus supplement
and the accompanying base prospectus form a part of a registration statement on <A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837022010504/tmb-20220701xs3.htm" STYLE="-sec-extract: exhibit">Form&nbsp;S-3 (File No.&nbsp;333-265967)</A>, which was declared
effective on August&nbsp;12, 2022, that we filed with the Securities Exchange Commission (&ldquo;SEC&rdquo;) utilizing a &ldquo;shelf&rdquo;
registration process.</P>

<P STYLE="text-align: left; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">This document is in two parts.
The first part is this prospectus supplement, which describes the specific terms of this offering and also adds to and updates information
contained in the accompanying prospectus and the documents incorporated by reference in this prospectus supplement and the accompanying
prospectus. The second part, the accompanying prospectus, provides more general information, some of which may not apply to this offering.
Generally, when we refer to this prospectus supplement, we are referring to both parts of this document combined. To the extent there
is a conflict between the information contained in this prospectus supplement and the information contained in the accompanying prospectus
or any document incorporated by reference that was filed with the SEC before the date of this prospectus supplement, you should rely on
the information in this prospectus supplement; provided that if any statement in one of these documents is inconsistent with a statement
in another document having a later date&thinsp;-&thinsp;for example, a document incorporated by reference in the accompanying prospectus&thinsp;-&thinsp;the
statement in the document having the later date modifies or supersedes the earlier statement.</P>

<P STYLE="text-align: left; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">We further note that the representations,
warranties and covenants made by us in any agreement that is filed as an exhibit to any document that is incorporated by reference herein
were made solely for the benefit of the parties to such agreement, including, in some cases, for the purpose of allocating risk among
the parties to such agreements, and should not be deemed to be a representation, warranty or covenant to you. Moreover, such representations,
warranties or covenants were accurate only as of the date when made. Accordingly, such representations, warranties and covenants should
not be relied on as accurately representing the current state of our affairs.</P>

<P STYLE="text-align: left; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">Neither we nor the underwriter
have authorized anyone to provide information different from that contained in this prospectus supplement and the accompanying prospectus,
including any free writing prospectus that we have authorized for use in connection with this offering. When you make a decision about
whether to invest in our securities, you should not rely upon any information other than the information in this prospectus supplement
or the accompanying prospectus, including any free writing prospectus that we have authorized for use in connection with this offering.
Neither the delivery of this prospectus supplement nor the accompanying prospectus, including any free writing prospectus that we have
authorized for use in connection with this offering, nor the sale of our common stock and warrants means that information contained in
this prospectus supplement and the accompanying prospectus, including any free writing prospectus that we have authorized for use in connection
with this offering, is correct after their respective dates. It is important for you to read and consider all information contained in
this prospectus supplement and the accompanying prospectus, including the information incorporated by reference into this prospectus supplement
and the accompanying prospectus, and any free writing prospectus that we have authorized for use in connection with this offering in making
your investment decision. You should also read and consider the information in the documents to which we have referred you in the sections
entitled &ldquo;Where You Can Find More Information&rdquo; and &ldquo;Information Incorporated by Reference&rdquo; in this prospectus
supplement.</P>

<P STYLE="text-align: left; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">We are offering to sell, and
seeking offers to buy, shares of our common stock and warrants only in jurisdictions where offers and sales are permitted. The distribution
of this prospectus supplement and the accompanying prospectus and the offering of the common stock and warrants in certain jurisdictions
may be restricted by law. Persons outside the United States who come into possession of this prospectus supplement and the accompanying
prospectus must inform themselves about, and observe any restrictions relating to, the offering of the common stock and warrants and the
distribution of this prospectus supplement and the accompanying prospectus outside the United States. This prospectus supplement and the
accompanying prospectus do not constitute, and may not be used in connection with, an offer to sell, or a solicitation of an offer to
buy, any securities offered by this prospectus supplement and the accompanying prospectus by any person in any jurisdiction in which it
is unlawful for such person to make such an offer or solicitation.</P>

<P STYLE="text-align: left; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">In this prospectus supplement,
unless the context otherwise requires, references to &ldquo;ClearSign,&rdquo; &ldquo;we,&rdquo; &ldquo;us,&rdquo; &ldquo;our&rdquo; or
the &ldquo;Company&rdquo; refer to ClearSign Technologies Corporation and its subsidiary, ClearSign Asia Limited.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="prossup_002"></A>MARKET,&nbsp;INDUSTRY AND OTHER DATA</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">This prospectus supplement and the accompanying
prospectus, including the information incorporated by reference, contains estimates, projections and other information concerning our
industry, our business, and the markets for certain products and services, including data regarding the estimated size of those markets
and their projected growth rates. Information that is based on estimates, forecasts, projections or similar methodologies is based on
a number of assumptions and is inherently subject to uncertainties, including those described in &ldquo;Risk Factors&rdquo; and elsewhere
in this prospectus supplement and the accompanying prospectus, and documents we incorporate by reference, and actual events or circumstances
may differ materially from events and circumstances reflected in this information. You are cautioned not to give undue weight to such
estimates, projections and other information.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="prossup_003"></A>DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">This prospectus supplement and the accompanying
prospectus, including the documents that we incorporate by reference, may contain forward-looking statements within the meaning of Section&nbsp;27A
of the Securities Act of 1933, as amended (the &ldquo;Securities Act&rdquo;), and Section&nbsp;21E of the Securities Exchange Act of 1934,
as amended (the &ldquo;Exchange Act&rdquo;).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Forward-looking statements in this prospectus and
any accompanying prospectus supplement include, without limitation, statements related to our plans, strategies, objectives, expectations,
intentions and adequacy of resources. Investors are cautioned that such forward-looking statements involve risks and uncertainties.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Factors that could cause actual results to differ
from those discussed in the forward-looking statements include, but are not limited to:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
limited cash, history of losses, and our expectation that we will continue to experience operating losses and negative cash flows in
the near future;</FONT></TD>
</TR></TABLE>

<P STYLE="margin: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
ability to successfully develop and implement our technologies and achieve profitability;</FONT></TD>
</TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
limited operating history;</FONT></TD>
</TR></TABLE>

<P STYLE="margin: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">changes
in government regulations that could substantially reduce, or even eliminate, the need for our technology;</FONT></TD>
</TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">emerging
competition and rapidly advancing technology in our industry that may outpace our technology;</FONT></TD>
</TR></TABLE>

<P STYLE="margin: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">customer
demand for the products and services we develop;</FONT></TD>
</TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">the
impact of competitive or alternative products, technologies and pricing;</FONT></TD>
</TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
ability to manufacture any products we design;</FONT></TD>
</TR></TABLE>

<P STYLE="margin: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">general
economic conditions and events and the impact they may have on us and our potential customers;</FONT></TD>
</TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
doing business in China and related risks with respect to intellectual property protection, currency exchange, contract enforcement,
rules&nbsp;on foreign investment;</FONT></TD>
</TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">the
impact of a cybersecurity incident or other technology disruption;</FONT></TD>
</TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
ability to protect our intellectual property;</FONT></TD>
</TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
ability to obtain adequate financing in the future;</FONT></TD>
</TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
ability to retain and hire personnel with the experience and talent to develop our products and business;</FONT></TD>
</TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">our
success at managing the risks involved in the foregoing items; and</FONT></TD>
</TR></TABLE>

<P STYLE="margin: 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">other
factors discussed in this prospectus supplement and the accompanying prospectus.</FONT></TD>
</TR></TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In some cases, you can identify forward-looking
statements by terminology such as &ldquo;may,&rdquo; &ldquo;will,&rdquo; &ldquo;should,&rdquo; &ldquo;could,&rdquo; &ldquo;expects,&rdquo;
 &ldquo;plans,&rdquo; &ldquo;intends,&rdquo; &ldquo;anticipates,&rdquo; &ldquo;believes,&rdquo; &ldquo;estimates,&rdquo; &ldquo;predicts,&rdquo;
 &ldquo;potential,&rdquo; or &ldquo;continue&rdquo; or the negative of such terms or other comparable terminology. Although we believe
that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee future results, levels of activity,
performance or achievements. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as
of the date hereof. We do not undertake any obligation to publicly update or review any forward-looking statement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="prossup_004"></A>PROSPECTUS SUPPLEMENT SUMMARY</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>This summary highlights information contained
elsewhere or incorporated by reference in this prospectus supplement, the accompanying prospectus and in the documents we incorporate
by reference. This summary does not contain all of the information that you should consider before deciding to invest in our common stock.
You should read this entire prospectus supplement carefully, including the &ldquo;Risk Factors&rdquo; section contained in this prospectus
supplement, the accompanying prospectus and in the documents we incorporate by reference.</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Our Business</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We design and develop technologies that have been
shown to significantly improve key performance characteristics of industrial combustion systems, including emission and operational performance,
energy efficiency and overall cost-effectiveness. We believe that our patented ClearSign Core&trade; technology can enhance the performance
of combustion systems in a broad range of markets, including the energy (upstream oil production and down-stream refining), institutional,
commercial and industrial boiler, chemical, and petrochemical industries. Our ClearSign Core technology, which is our primary technology,
uses either a porous ceramic structure or metal flame holder device held at a distance from the injection planes of a burner to significantly
reduce flame length and achieve low emissions without the need for external flue gas recirculation, selective catalytic reduction, or
high excess air systems. To date, our operations have been funded primarily through sales of our equity securities. We have earned nominal
revenue since inception in 2008.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our combustion technology has been successfully
deployed in commercial projects such as down-stream refining and upstream oil production. These applications include both our process
burner and boiler burner technologies. Our process burner technology is able to operate in high-intensity multiple burner industrial applications
at sites that are required to meet low air pollutant emissions. Our boiler burner technology, which has been proven to achieve ground-breaking
low air pollutant emissions, has been deployed in the US and is currently undergoing commercialization in China.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We believe that combustion equipment utilizing
ClearSign Core technology is more effective and cost-efficient than current industry-standard air pollution control technologies, and
can reduce nitrogen oxide (NOx) emissions down to the levels required by new stringent emission regulations. NOx is a regulated greenhouse
gas pollutant comprised of nitrogen oxide and nitrogen dioxide. These current technologies include selective catalytic reduction devices
(SCRs), low- and ultra-low NOx burners, external flue gas recirculation systems and other similar technologies. Such air pollution control
systems are widely used in places within our current target markets such as in petroleum refining and petrochemical process heaters, large-scale
once through steam generators (OTSGs), enclosed flares, institutional commercial and industrial boilers and other similar equipment. We
believe that our ClearSign Core technology can provide value to our customers not only by helping them meet current and possible future
legislative mandates to reduce pollutant emissions, but also by improving operating efficiency and increasing overall return on investment.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Based on the operating data we have obtained from
our installed products, burners utilizing ClearSign Core technology can provide increased heat transfer efficiency as compared to other
emission reducing technologies. This is consistent with the physics of heat transfer and the mechanisms by which the technology functions.
The reported increased heat transfer efficiency may potentially result in cost savings in the low to mid-single digit percentage range
for burners employing our technology. We believe that these potential costs savings could produce an extremely attractive pay-back period
for an investment in ClearSign Core technology-based burners. In addition, because the flame volumes in heaters utilizing ClearSign Core
technology are typically small, heaters using our technology are expected to operate at a lower cost, have increased productivity, and
require less maintenance and downtime compared to heaters that operate with enlarged flames produced by traditional low NOx burners. The
flames in a ClearSign Core system are established from a predominantly premixed stream of fuel, combustion air and flue gasses stabilized
on a downstream structure that promotes turbulence and ignition with minimal &ldquo;bulking up&rdquo;. In comparison, flames resulting
from the traditional legacy process of slow mixing of the fuel and air, and dilutive inert flue gasses have a much larger size. With a
lower volume flame in a ClearSign Core system, surfaces in the heater or boiler experience less touching by the flame and it is anticipated
that our systems can virtually eliminate flame impingement. Our technology also enables burners to function better in tightly spaced heaters
compared to the flames of traditional low NOx burners. Most importantly, using our technology has the potential to decrease process downtime
required during installation compared to retrofits utilizing the legacy technology of SCRs or flue gas recirculation systems.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

</DIV>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We are also designing and commercializing a range
of sensing products called the ClearSign EyeTM for two potential markets. The primary addressable market is similar to that of our ClearSign
Core technology, although not limited to regions requiring emissions reduction. The flame sensing products are applicable to all installed
burners that use a pilot for ignition, including in markets and regions beyond those where reducing emissions is a high priority. Like
our burner technology, our burner sensing technology is being developed to provide convenient replacement and retrofit solutions for existing
equipment as well as for inclusion in newly built equipment.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The secondary potential market for our sensing
technology is outside of the typical combustion industry and includes transportation industries. While use of this fundamental technology
in applications intended for transportation markets is proven, the development and refinement of specific products, obtaining the certifications
required for commercial deployment and establishing an efficient manufacturing source and channels to market will take some time, and
we cannot assure that these goals will be achieved. We believe that the opportunities for application of our sensing technology in the
transportation market are global and of great value, but it will also take longer to commercialize products targeted for this market for
the reasons stated above.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Overall, our sensing technologies could provide
future diversification as well as the opportunity for continued business expansion and growth beyond the maturation of our combustion-related
businesses.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Our Industry</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
combustion and emissions control systems markets are significant, both with respect to the wide array of industries in which the systems
are used and the amount of capital spent installing and upgrading the systems. Combustion systems are used to provide heat for many different
industrial and commercial processes, including boilers, petrochemical process heaters, and waste disposal systems. In order to maximize
energy efficiency while keeping pace with regulatory guidelines for air pollution emissions, operators of combustion systems are continually
installing, maintaining, and upgrading a variety of costly process control, air pollution control and monitoring systems. Although we
believe that there are many potential markets for our ClearSign Core technology, to date we have limited the introduction of this technology
to petroleum refining process heaters, energy infrastructure process heaters, boilers for steam and hot water generation, boilers for
building heating systems, and enclosed flares. </FONT>We have initially targeted these markets for various reasons, such as, but not limited
to: (i)&nbsp;environmental regulations imposed on these markets, (ii)&nbsp;total available market size, (iii)&nbsp;this technology being
the most readily adapted to the needs of these industries and (iv)&nbsp;management experience and expertise.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our initial target markets center on the energy
sector, including downstream oil refineries through the use of process heaters and boilers as well as upstream crude oil production through
the use of Once Through Steam Generator (OTSGs) and wellhead enclosed flares. We believe operators in our domestic target markets are
under pressure to meet current and proposed federal, state and local pollution emissions standards. The standards applicable to our target
markets have been developed over the past 50 years with broad political input. Due to the localized effects of poor air quality, we expect
these standards to continue to become more stringent regardless of political leadership. As an illustration, air pollution emission standards
are most stringent in the states of California and Texas, which historically have had leadership from different political parties. We
believe this to be the case in the U.S. and worldwide in most major developed and developing countries. As a result, these standards are
a significant driver for our development and sales efforts. We believe that our ClearSign Core technology can provide a unique, cost-effective
pollution control solution for operators in comparison to known competing products.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; color: #222222">In the U.S., emissions standards
largely emanate from the Clean Air Act, which is administered by the Environmental Protection Agency (EPA) and regulates six common criteria
air pollutants, including ground-level ozone. These regulations are enforced by state and local air quality districts as part of their
compliance plans. As a precursor to ground-level ozone, NOx is a pollutant that is regulated by local air quality districts in order to
achieve the EPA limits. The 8-hour ground-level ozone regulations have been reduced from 80 parts per billion (ppb) in 1997, to 75 ppb
in 2008, and 70 ppb in 2015, with the requirement of realizing these levels approximately 20 years following the year of legislation.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
</DIV>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; color: #222222">We have noted that local air quality
districts designated by the EPA as &ldquo;severe non-attainment zones&rdquo; in California and Texas have undertaken a review of their
air pollutant emissions regulations. These reviews are ongoing, in most regions, but two important regions have recently amended their
local regulations to improve air quality. In December&nbsp;of 2020, the San Joaquin Valley region of California revised its regulations
to require significant reductions in target NOx emissions from boilers, steam generators and process heaters. And, in November&nbsp;of
2021, the greater Los Angeles area also revised its regulations. These revised regulations, it substantially reduced target emissions
for process heaters, boilers and other similar equipment Pursuant to a new and comprehensive Best Available Retrofit Control Technology
(BARCT) analysis, which we believe will result in an increased demand for our services and products.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white; color: #222222">In addition,
new regulations are starting to be adopted with respect to the NOx emissions of enclosed ground flares, which historically have not been
viewed as a source of NOx emissions or subject to the same level of regulation. We believe that our ClearSign Core technology is well-suited
to address the challenges faced by oil producers and other industries in complying with current and predicted future local air emission
standards. There are multiple ClearSign Core flare applications now operational in California with NOx emissions below the levels required
by new regulations.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white; color: #222222">In addition,
we believe that current emissions standards in Europe, the Middle East, parts of Asia and Canada will continue to become stricter as these
jurisdictions seek to achieve cleaner air. Existing and new emissions standards in such jurisdictions may create additional market opportunities
for us. To date, we have one installation operating in the refinery of a major global oil refiner in Europe.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; color: #222222">The current environmental impetus
to reduce CO2 emissions has created an interest in burner technology that can use hydrogen as a fuel source. Because hydrogen burns at
a higher temperature than most other fuel gasses, it tends to create more NOx emissions. ClearSign Core burners have demonstrated the
ability to burn fuels with up to 80% hydrogen while still controlling NOx emissions to meet required regulatory levels.&nbsp;&nbsp;We
believe that we can extend the capability of our ClearSign Core technology to burn &ldquo;pure&rdquo; hydrogen fuel.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Recent Developments</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>South Coast Air Quality Management District of California BACT
Determination</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; color: #222222">On February&nbsp;2, 2024, the South
Coast Air Quality Management District of California (SCAQMD) as part of its periodic public participation process to enhance existing
Best Available Control Technologies (BACT) determinations, assessed the process burner performance of our ClearSign Core&trade; burner
technology in certain currently operating client installations. As a result of this assessment, SCAQMD approved new BACT performance guidelines
for both single and multi-burner configurations. BACT guidelines are periodically updated by SCAQMD to reflect advancements in technology
and to ensure affected equipment utilize the most efficient technologies. While the establishment of a new BACT benchmark does not specifically
endorse ClearSign or our products, it does establish a limit in the industry that favors our products. According to SCAQMD, BACT is the
most stringent emission limitation or control technique for a class and category of equipment that is &ldquo;Achieved in Practice,&rdquo;
or &ldquo;Contained in a State Implementation Plan (SIP)&rdquo;, or &ldquo;Technologically Feasible.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>Letter of Intent for Four ClearSign Core&trade; (Rogue) Boilers</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">On February&nbsp;21, 2024, we announced that our
collaborative partner California Boiler, received a letter of intent for four boilers to be fitted with the ClearSign Core&trade; (Rogue)
burners as well as the purchase order for the first boiler burner of the series, and has in turn placed their order with ClearSign for
the first burner. This purchase order relates to an end customer that is a fruit and vegetable multi-juice processing company located
in California&rsquo;s Central Valley. The additional burner orders will be issued concurrent with the construction of additional planned
fruit processing lines of the customer.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>ATM Suspension</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">On
March&nbsp;18, 2024, we filed a prospectus supplement suspending the sales of common stock under our At-the-Market (&ldquo;ATM&rdquo;)
program pursuant to that certain Sales Agreement between us and Virtu Americas, LLC, as sales agent, dated December&nbsp;23, 2020 (the
 &ldquo;Sales Agreement&rdquo;). </FONT>We will not make any sales of our shares of common stock pursuant to the Sales Agreement unless
and until a new prospectus supplement is filed with the SEC; however, the Sales Agreement remains in full force and effect.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
</DIV>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Nasdaq Compliance</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">On November&nbsp;24, 2023, we received a notice
(the &ldquo;Notice&rdquo;) from the Listing Qualifications Department of the Nasdaq Stock Market LLC (&ldquo;Nasdaq&rdquo;) stating that
the previously announced resignation of Gary DiElsi from the our board of directors resulted in noncompliance with the board of directors
independence requirements set forth in Nasdaq Listing Rule&nbsp;5605(b)(1)&nbsp;and the requirement in Nasdaq Listing Rule&nbsp;5605(c)(2)(A)&nbsp;to
have an audit committee of at least three independent directors. More specifically, when the Notice was issued, our board of directors
did not have a majority of directors who would be considered &ldquo;independent directors,&rdquo; as that term is defined in Nasdaq Listing
Rule&nbsp;5605(a)(2)&nbsp;and the audit committee of our board of directors consisted of only two independent directors. Consistent with
Nasdaq Listing Rules&nbsp;5605(b)(1)(A)&nbsp;and Rule&nbsp;5605(c)(4), Nasdaq has provided the Company a cure period in order to regain
compliance (i)&nbsp;until the earlier of the Company&rsquo;s next annual shareholders&rsquo; meeting or November&nbsp;11, 2024, or (ii)&nbsp;if
the next annual shareholders&rsquo; meeting is held before May&nbsp;7, 2024, then the Company must evidence compliance no later than May&nbsp;7,
2024. The Notice has no immediate effect on the listing of our common stock on the Nasdaq Capital Market.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Estimated Preliminary Operational Results for the Fourth Quarter
and Year Ended December&nbsp;31, 2023</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We are currently in the process of finalizing our
consolidated financial results for our fourth quarter and year ended December&nbsp;31, 2023 and, therefore, our actual results for these
periods are not yet available and have not been audited. Presented below are certain estimated preliminary operational results for the
fourth quarter and year ended December&nbsp;31, 2023 that are subject to change pending finalization. As such, our actual results may
differ materially from the estimated preliminary results presented in this prospectus supplement and will not be finalized until after
we complete our normal year-end accounting procedures, which will occur after the consummation of this offering. Our preliminary results
set forth below reflect management&rsquo;s best estimate of the impact of events during the year and are based on the information currently
available to us as of the date of this prospectus supplement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Accordingly, undue reliance should not be placed
on these preliminary estimates. These preliminary estimates should not be taken as indicative of any future period and should be read
together with &ldquo;Risk Factors,&rdquo; &ldquo;Disclosure Regarding Forward-Looking Statements&rdquo; and &ldquo;Management&rsquo;s
Discussion and Analysis of Financial Condition and Results of Operations,&rdquo; and our consolidated financial statements and related
notes, in each case included or incorporated by reference in this prospectus supplement and the accompanying prospectus.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Preliminary revenues for the three months ended
December&nbsp;31, 2023 was approximately $1.2 million, compared to $50 thousand for the comparable period in 2022. The Company&rsquo;s
estimated preliminary revenues for the year ended December&nbsp;31, 2023 was $2.3 million, compared to $374 thousand for the year ended
December&nbsp;31, 2022. The Company reported a net loss of approximately $5.8 million for the year ended 2022, and it estimates that the
preliminary net loss for the year ended December&nbsp;31, 2023 will range between $5.4 and $5.1 million.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
</DIV>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="prossup_005"></A>THE OFFERING</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 40%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Issuer</B></FONT></TD>
    <TD STYLE="width: 60%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">ClearSign Technologies Corporation</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-top: 12pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Common stock offered by us pursuant to this prospectus supplement</B></FONT></TD>
    <TD STYLE="padding-top: 12pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; shares of common stock.</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-top: 12pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Warrants offered by us pursuant to this prospectus supplement</B></FONT></TD>
    <TD STYLE="padding-top: 12pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Redeemable
    warrants to purchase&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; shares of our common
    stock (the &ldquo;warrants&rdquo;), at the rate of one warrant for every three shares of common stock purchased in this offering. The
    shares of common stock and warrants are being offered separately and not as a unit, but we expect that the underwriter will allocate purchases
    by investors in lots comprised of multiples of three shares of common stock and one warrant. No fractional shares of common stock
    will be issued in connection with the exercise of a warrant and no warrants exercisable for a fractional share will be issued in this
    offering. In lieu of fractional shares upon exercise of a warrant, we will, at our election, either pay a cash adjustment in an amount
    equal to the fraction multiplied by the exercise price or round up to the next whole share. Each warrant has an exercise price of $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;per
    share, subject to adjustment. The warrants will be exercisable beginning on the date of issuance and expire on the fifth anniversary of
    the date of issuance. </FONT>See &ldquo;Description of Securities We Are Offering &ndash; Description of Warrants&rdquo; on page S-14 of this prospectus
    supplement.</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">The warrants issued in this offering are not listed on any securities
    exchange, including Nasdaq, and we do not intend to list the warrants on any exchange or any other nationally recognized trading system.</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Holders of the warrants will not be able to exercise their warrants
    on a cashless basis. We may redeem the warrants for $0.01 per warrant upon 30 days&rsquo; advance notice if the closing price of our common
    stock equals to or exceeds $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; for any 20 business days within a
    30-business day period.</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-top: 12pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Common stock to be outstanding after this offering</B></FONT></TD>
    <TD STYLE="padding-top: 12pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;shares of our common stock (or&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; shares if the underwriter exercises its option to purchase additional shares in full), assuming none of the warrants issued in this offering are exercised.</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-top: 12pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Over-allotment option</B></FONT></TD>
    <TD STYLE="padding-top: 12pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">We have granted to the
    underwriter the option, exercisable for 45 days from the date of this prospectus, to purchase up
    to&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;additional shares of
    our common stock or up to&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; additional shares of
    our common stock and accompanying warrants to purchase up to
    an&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
    additional shares of common stock, in each case, at the public offering price and ratio to the public, as applicable, less underwriting discounts and commissions, to cover
    overallotments, if any. The underwriter may exercise the over-allotment option with respect to shares of our common stock only or shares of our common stock and
accompanying warrants.</FONT></TD></TR>
</TABLE>

<P STYLE="margin: 0">&nbsp;</P>
</DIV>
<P STYLE="margin: 0"></P>

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<P STYLE="margin: 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 40%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Use of proceeds</B></FONT></TD>
    <TD STYLE="width: 60%">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">We estimate that the net proceeds to us from this offering, after deducting
    estimated underwriting discounts and estimated offering expenses payable by us, will be approximately $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;million
    (or approximately $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; million if the underwriter exercises its option to purchase
    additional shares in full) and assuming no exercise of the warrants.</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
    intend to use the net proceeds of this offering working capital, research and development, marketing and sales, and general corporate
    purposes. See &ldquo;Use of Proceeds&rdquo; on page&nbsp;S-13 of this prospectus supplement.</FONT></P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-top: 12pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Risk factors</B></FONT></TD>
    <TD STYLE="padding-top: 12pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">See &ldquo;Risk Factors&rdquo; beginning on page&nbsp;</FONT>S-10 of this prospectus supplement, and in the documents included or incorporated into this prospectus supplement, for a discussion of certain factors you should carefully consider before deciding to invest in shares of our common stock or warrants to purchase our common stock.</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-top: 12pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Lock-ups</B></FONT></TD>
    <TD STYLE="padding-top: 12pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">We, our executive officers and directors and clirSPV, LLC, our largest stockholder (&ldquo;clirSPV&rdquo;), have entered into certain &ldquo;lock-up&rdquo; agreements with the underwriters, pursuant to which we and they have agreed, among other things, not to, or are subject to other restrictions so that we/they may not, without the prior written consent of the underwriter, directly or indirectly, dispose of our common stock or any securities convertible into or exercisable or exchangeable for our common stock. The officer and director lock up is for a </FONT>6-month period commencing the closing of the offering. The lock up for the Company and clirSPV is until December&nbsp;31, 2024; provided clirSPV may sell, into the public market only, shares of common stock at such times as the net per share price at which they are sold exceeds two times the per share price in this offering and the aggregate number of shares sold per day does not exceed 15% of the daily volume of the shares of common stock on that date. See &ldquo;Underwriting&rdquo; on page&nbsp;S-16 of this prospectus supplement.</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-top: 12pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Purchase Right</B></FONT></TD>
    <TD STYLE="padding-top: 12pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">clirSPV has the right to purchase common stock and warrants on the same terms being offered in this offering in a subsequent private placement. For further information relating to their purchase right, please see the section of this prospectus supplement titled &ldquo;Underwriting &ndash; Purchases by Affiliates&rdquo; at page&nbsp;S-18 of this prospectus supplement.</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-top: 12pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>The Nasdaq Capital Market symbol</B></FONT></TD>
    <TD STYLE="padding-top: 12pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&ldquo;CLIR&rdquo;</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
</DIV>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The number of shares of our common stock that
will be outstanding after this offering is based on 38,732,218 shares outstanding as of March&nbsp;18, 2024, and excludes the following,
in each case as of such date:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>751,000 shares of common stock issuable upon the vesting of outstanding restricted stock units;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>2,759,000 shares issuable upon the exercise of outstanding stock options with a weighted-average exercise price of $2.07 per share;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>491,000 shares issuable upon the exercise of outstanding stock options granted outside of our Equity Incentive Plans at a weighted
average exercise price of $1.53 per share</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>1,871,000 shares reserved for future issuances under the ClearSign Technologies Corporation 2021 Equity Incentive Plan (the &ldquo;2021
Equity Incentive Plan&rdquo;);</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>188,000 shares reserved for future issuances under the ClearSign Technologies Corporation 2013 Consultant Stock Plan (the &ldquo;2013
Consultant Stock Plan&rdquo;);</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;shares of our common stock issuable upon exercise of the warrants to be issued in this offering; and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&#9679;</TD><TD>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;shares of our common stock issuable upon exercise of the warrants to be issued to the underwriter in this offering.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Except as otherwise noted, all information in this
prospectus supplement assumes no exercise by the underwriter of its option to purchase additional shares of common stock and/or warrants
from us, no exercise of outstanding options or warrants to purchase common stock and no issuance of shares available for future issuance
under the 2021 Equity Inventive Plan and the 2013 Consultant Stock Plan; and reflects all currency in U.S. dollars.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
</DIV>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="prossup_006"></A>RISK FACTORS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Investing in our securities involves a high
degree of risk. Before deciding whether to invest in our securities, you should carefully consider the risk factors we describe in this
prospectus supplement and in any related free writing prospectus that we may authorize to be provided to you or in any report incorporated
by reference into this prospectus supplement, including <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000155837023005285/clir-20221231x10k.htm" STYLE="-sec-extract: exhibit">our Annual Report on Form&nbsp;10-K for the year ended December&nbsp;31, 2022</A>,
our Quarterly Reports on Form&nbsp;10-Q for the quarters ended <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000155837023009840/clir-20230331x10q.htm" STYLE="-sec-extract: exhibit">March&nbsp;31, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000155837023014714/clir-20230630x10q.htm" STYLE="-sec-extract: exhibit">June&nbsp;30, 2023</A> and <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000155837023019018/clir-20230930x10q.htm" STYLE="-sec-extract: exhibit">September&nbsp;30, 2023</A>, or
any other filing by us with the SEC that is incorporated by reference into this prospectus supplement. Although we discuss key risks in
those risk factor descriptions, additional risks not currently known to us or that we currently deem immaterial also may impair our business.
Our subsequent filings with the SEC may contain amended and updated discussions of significant risks. We cannot predict future risks or
estimate the extent to which they may affect our financial performance.</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Risks Associated with this Offering</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>In making your investment decision, you should rely only on statements
made in this prospectus supplement in determining whether to purchase our securities.</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">You should carefully evaluate all of the information
in this prospectus supplement. We have in the past received, and may continue in the future to receive, media coverage, including coverage
that is not directly attributable to statements made by our officers and employees, that incorrectly reports on statements made by our
officers or employees or that is misleading as a result of omitting to state information provided by us or our officers or employees.
You should rely only on the information contained in this prospectus supplement and the accompanying prospectus in determining whether
to purchase our securities.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>Management will have broad discretion as to the use of proceeds
from this offering and we may use the net proceeds in ways with which you may disagree.</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We currently intend to use the net proceeds of
this offering for working capital, research and development, marketing and sales, and general corporate purposes. We have not allocated
specific amounts of the net proceeds from this offering for any of the foregoing purposes. Our management will have broad discretion and
flexibility in the application of the net proceeds from this offering and could spend the proceeds in ways that do not improve our results
of operations or enhance the value of our common stock or other securities. Accordingly, you will be relying on the judgment of our management
on the use of the net proceeds, and you will not have the opportunity, as part of your investment decision, to assess whether the proceeds
are being used appropriately. Our failure to apply these funds effectively could have a material adverse effect on our business, delay
the development of our products and cause the price of our common stock or other securities to decline.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>Following this offering, we will require additional capital
to finance our operations and achieve our goals. If we are unable to raise capital when needed or on terms acceptable to us, we may be
forced to delay, reduce or eliminate our development and commercialization efforts and our business may fail.</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our business is capital-intensive and requires
capital investments in order for it to develop. Our cash on hand will likely not be sufficient to meet all of our future needs because
our target customers are, in general, slow to adopt new technologies, and we anticipate that we will require substantial additional funds
in excess of our current financial resources for research, development and commercialization of our technology, to obtain and maintain
patents and other intellectual property rights in our technology, and for working capital and other purposes, the timing and amount of
which are difficult to ascertain. Until our technology generates revenues sufficient to support our operations, we plan to obtain the
necessary working capital for operations through the sale of our securities, but we may not be able to obtain financing in amounts sufficient
to fund our business plans.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In addition, we may seek additional capital due
to favorable market conditions or strategic considerations even if we believe we have sufficient funds for our current or future operating
plans. If we are unable to raise capital when needed or on favorable terms, we could be forced to delay, reduce or eliminate our development
and commercialization efforts and our business may fail. Our ability to raise capital may be adversely impacted by potential worsening
global economic conditions and disruptions to and volatility in the credit and financial markets in the United States and worldwide resulting
from inflation, changes in interest rates, recent turmoil in the global banking system, geopolitical instability, including the war in
Ukraine, the Middle East and public health epidemics. .</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>If you purchase the securities sold in this offering, you will
experience immediate and substantial dilution.</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
price of our common stock to be sold in this offering or issuable upon exercise of the warrants being offered is substantially higher
than the net tangible book value per share of our common stock. If you purchase securities in this offering, you will experience immediate
dilution of $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;per offered share, representing the difference between as adjusted
net tangible book value per share after giving effect to the sale by us of shares of common stock in this offering at the public offering
price of $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; per share. See the section entitled &ldquo;Dilution&rdquo;
below for a more detailed discussion of the dilution you will incur if you purchase common stock in this offering. </FONT>Further, we
have a significant number of options and restricted stock outstanding, in addition to the warrants being issued in this offering. If the
holders of these securities exercise them or become vested in them, as applicable, you may incur further dilution.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>You may experience future dilution as a result of future equity
offerings.</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In order to raise additional capital, we may in
the future offer additional shares of our common stock or other securities convertible into or exchangeable for our common stock at prices
that may be the same or lower than the price per share in this offering. We may not be able to sell shares or other securities in any
other offering at a price per share that is equal to or greater than the price per share paid by investors in this offering, and investors
purchasing shares or other securities in the future could have rights superior to existing stockholders. The price per share at which
we sell additional shares of our common stock or securities convertible into common stock in future transactions may be higher or lower
than the price per share in this offering. You will incur dilution upon exercise of any outstanding stock options, warrants or upon the
issuance of shares of common stock under our stock incentive programs. In addition, the sale of shares in this offering and any future
sales of a substantial number of shares of our common stock in the public market, or the perception that such sales may occur, could adversely
affect the price of our common stock. We cannot predict the effect, if any, that market sales of those shares of common stock or the availability
of those shares of common stock for sale will have on the market price of our common stock.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>Sales of a significant number of shares of our common stock in
the public markets, or the perception that such sales could occur, could depress the market price of our common stock.</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Sales of a substantial number of shares of our
common stock in the public markets, or the perception that such sales could occur, could depress the market price of our common stock
and impair our ability to raise capital through the sale of additional equity securities. We may issue and sell additional shares of our
common stock in the public markets including, without limitation, through our &ldquo;at-the-market&rdquo; offering program, underwritten
public offerings, privately negotiated transactions, block trades, or any combination of the above. We cannot predict the effect that
future sales of our common stock would have on the market price of our common stock.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>Because we do not anticipate paying any cash dividends on our
capital stock in the foreseeable future, capital appreciation, if any, will be your sole source of gain.</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We plan to reinvest all of our earnings, to the
extent we have earnings, in order to continue to develop our products, to market our products, to cover operating costs and to otherwise
become and remain competitive. We do not plan to pay any cash dividends with respect to our securities in the foreseeable future. Any
future determination to pay cash dividends will be at the discretion of our board of directors and will depend on applicable law and then-existing
conditions, including our financial condition, operating results, contractual restrictions, capital requirements, business prospects and
other factors our board of directors may deem relevant. As a result, capital appreciation, if any, of our common stock will be your sole
source of gain for the foreseeable future.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>There is no public market for the warrants.</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">There is no established public trading market for
the warrants in this offering, and we do not expect a market to develop. In addition, the warrants are not listed, and we do not intend
to apply for listing of the warrants on any securities exchange or trading system. Without an active market, the liquidity of the warrants
is limited, and investors may be unable to liquidate their investments in the warrants.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>A warrant does not entitle the holder to any rights as common
stockholders until the holder exercises the warrant for shares of our common stock.</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Until you acquire shares of our common stock upon
exercise of your warrants, the warrants will not provide you any rights as a common stockholder. Upon exercise of your warrants, you will
be entitled to exercise the rights of a common stockholder only as to matters for which the record date occurs on or after the exercise
date.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>The warrants in this offering are speculative in nature.</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The warrants in this offering do not confer any
rights of common stock ownership on their holders, such as voting rights or the right to receive dividends, but rather merely represent
the right to acquire shares of common stock at a fixed price during a fixed period of time. Specifically, commencing on the date of issuance,
holders of the warrants may exercise their right to acquire common stock and pay an exercise price of $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;per
share of common stock. The warrants will be exercisable beginning on the date of issuance and expire on the fifth anniversary of the date
of issuance.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Moreover, following this offering, the market value
of the warrants, if any, is uncertain and there can be no assurance that the market value of the warrants will equal or exceed their imputed
offering price. There can also be no assurance that the market price of the common stock will ever equal or exceed the exercise price
of the warrants and, consequently, whether it will ever be profitable for holders of the warrants to exercise the warrants.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>The warrants being issued in this offering may be redeemed prior
to their exercise at a time that is disadvantageous to you, thereby significantly diminishing the value of your warrants.</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We will have the ability to redeem the warrants
included in this offering at any time once they become exercisable and prior to their expiration, at a price of $0.01 per warrant provided
that the last reported sales price of the underlying common stock equals or exceeds $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;per
share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations and the like) for any 20 business days within
a 30 business-day period ending on the business day prior to the date on which we send the notice of redemption to the warrant holders
and provided certain other conditions are met. If and when the warrants become redeemable by us, we may exercise our redemption right
even if we are unable to register or qualify the underlying securities for sale under all applicable state securities laws. As a result,
we may redeem the warrants as set forth above even if the holders are otherwise unable to exercise the warrants. Redemption of the outstanding
warrants could force you (i)&nbsp;to exercise your warrants and pay the exercise price therefor at a time when it may be disadvantageous
for you to do so, (ii)&nbsp;to sell your warrants at its then-current fair market value when you might otherwise wish to hold your warrants
or (iii)&nbsp;to accept the nominal redemption price which, at the time the outstanding warrants are called for redemption, we expect
would be less than the fair market value of your warrants. As a result, the value received upon exercise of the warrants may be less than
the value the holders would have received if they had exercised their warrants at a later time where the underlying common stock price
is higher and may not compensate the holders for the actual fair market value of the warrants.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="a_001"></A>USE OF PROCEEDS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We estimate that the net proceeds from this offering
will be approximately $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; million, after deducting the underwriting discount and commissions
and estimated offering expenses payable by us and excluding the proceeds, if any, from the exercise of the accompanying warrants.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">If all of the warrants sold in this offering were
to be exercised in cash at the exercise price of $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; per share, we would receive additional
proceeds of approximately $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; million. We cannot predict when or if these warrants will
be exercised. It is possible that these warrants may not be exercised at all.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We currently intend to use the net proceeds from
the sale of our common stock for working capital, research and development, marketing and sales, and general corporate purposes.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The amounts and timing of our actual expenditures
will depend on numerous factors, including the factors described under &ldquo;Risk Factors&rdquo; in this prospectus supplement, the accompanying
prospectus and in the documents incorporated by reference herein, as well as the amount of cash used in our operations. We may find it
necessary or advisable to use the net proceeds for other purposes, and our management will have significant flexibility in applying the
net proceeds of this offering.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Pending their use, we intend to invest the net
proceeds of this offering in direct and guaranteed obligations of the United States, interest-bearing, investment-grade instruments or
certificates of deposit.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="a_002"></A>DESCRIPTION OF SECURITIES WE ARE OFFERING</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Common Stock</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We are offering shares of our common stock in this
offering. See &ldquo;Description of Securities That May&nbsp;Be Offered &ndash; Description of Common Stock&rdquo; in the accompanying
prospectus for more information regarding our shares of common stock.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Description of Warrants</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The material terms and provisions of the warrants
being issued in this offering are summarized below. The following description is subject to, and qualified in its entirety by, the form
of warrant, which will be filed as an exhibit to a Current Report on Form&nbsp;8-K filed with the SEC. Prospective investors should carefully
review the terms and provisions set forth in the form of warrant.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Exercise
Price</I></FONT>. The initial exercise price is $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;per share of
common stock. The exercise price is subject to appropriate adjustment in the event of certain stock dividends and distributions, stock
splits, stock combinations, reclassifications or similar events affecting our common stock.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Exercisability</I></FONT>.
The warrants are exercisable at any time after the date of issuance, in whole or in part, and at any time up to the date that is five
years from the date of issuance, at which time any unexercised warrants will expire and cease to be exercisable. The warrants will be
exercisable, at the option of each holder, in whole or in part by delivering to us a duly executed exercise notice and by payment in full
in immediately available funds for the number of shares of common stock purchased upon such exercise. No fractional shares of common stock
will be issued in connection with the exercise of a warrant and no warrants exercisable for a fractional share will be issued in this
offering. Accordingly, unless you purchase at least three shares of common stock, you will not be able to receive a warrant. However,
we expect that the underwriter of this offering will allocate purchases by investors in lots comprised of multiples of three shares
of common stock and one warrant, and that, accordingly, there will be no warrants exercisable for fractional shares issued. In lieu of
fractional shares upon exercise of warrant, we will, at our election, either pay a cash adjustment in respect of such fraction in an amount
equal to such fraction multiplied by the exercise price or round up to the next whole share.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Transferability</I></FONT>.
A warrant in book entry form may be transferred at the option of the holder through the facilities of The Depository Trust Company (&ldquo;DTC&rdquo;)
and warrants in physical form may be transferred upon surrender of the warrant to the Warrant Agent together with the appropriate instruments
of transfer. Pursuant to a warrant agent agreement between us and the Warrant Agent, the warrants initially will be issued in book-entry
form and will be represented by one or more global certificates deposited with DTC and registered in the name of Cede&nbsp;&amp; Co.,
a nominee of DTC, or as otherwise directed by DTC.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Redemption</I></FONT>.
At any&nbsp;time prior to the full exercise or the termination date of the warrants, the Company has the right to call the warrants for
redemption upon 30 days&rsquo; prior written or published notice at a price of $0.01 per warrant, provided that the closing bid quotation
for our common stock, for at least 20 of the 30 consecutive business days ending on the business day prior to the Company&rsquo;s giving
notice of redemption, has been at least $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;per share,
subject to adjustment. Holders of the warrants have the right to exercise the warrants prior to the date set forth in the Company&rsquo;s
notice of redemption. After such date, all rights of the holders will terminate, other than the right to receive the redemption price
of $0.01 per warrant, without interest.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Fundamental
Transactions</I></FONT>. In the event of a fundamental transaction, as described in the warrants and generally including any reorganization,
recapitalization or reclassification of our common stock, the sale, transfer or other disposition of all or substantially all of our properties
or assets, or our consolidation or merger with or into another person, the holders of the warrants will be entitled to receive upon exercise
of the warrants the kind and amount of securities, cash or other property that the holders would have received had they exercised the
warrants immediately prior to such fundamental transaction.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Exchange
Listing</I></FONT>. We do not plan to apply to list the warrants on the Nasdaq Capital Market, any other national securities exchange
or any other nationally recognized trading system.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Rights
as a Stockholder</I></FONT>. Except as otherwise provided in the warrants or by virtue of such holder&rsquo;s ownership of shares of our
common stock, the holder of a warrant does not have the rights or privileges of a holder of our common stock, including any voting rights,
until the holder exercises the warrant.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="a_003"></A>DILUTION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">If
you invest in our securities, your interest will be diluted to the extent of the difference between the public offering price per share
of common stock offered in this offering, excluding shares of common stock issuable upon exercise of the warrants being offered in this
offering, and the net tangible book value per share of our common stock immediately after this offering. Our net tangible book value as
of September&nbsp;30, 2023 was $</FONT>5.2 million, or $0.13 per share. Net tangible book value per share is equal to our total tangible
assets, less our total liabilities, divided by the total number of shares of our common stock outstanding as of September&nbsp;30, 2023.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">After giving effect to the sale of the common stock
in this offering, excluding shares of common stock issuable upon exercise of the warrants being offered in this offering, at an offering
price of $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;per share, and after deducting estimated offering commissions our
net tangible book value as of September&nbsp;30, 2023 would have been $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;million,
or $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;per share of common stock. This represents an immediate increase in net
tangible book value of $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;per share and an immediate dilution in
net tangible book value of $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;per share to new investors in this
offering.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following table illustrates this calculation
on a per share basis:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="background-color: #CCEEFF">
    <TD STYLE="white-space: nowrap; vertical-align: bottom; width: 75%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Public offering price per share </FONT></TD>
    <TD STYLE="vertical-align: top; width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 10%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%">&nbsp;</TD>
    <TD STYLE="white-space: nowrap; vertical-align: bottom; width: 1%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="white-space: nowrap; vertical-align: bottom; width: 10%">&nbsp;</TD>
    <TD STYLE="white-space: nowrap; vertical-align: bottom; width: 1%">&nbsp;</TD></TR>
  <TR STYLE="background-color: white">
    <TD STYLE="white-space: nowrap; vertical-align: bottom"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Net tangible book value per share as of September&nbsp;30, 2023 </FONT></TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="text-align: right; vertical-align: top"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">0.13</FONT></TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="white-space: nowrap; vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="white-space: nowrap; vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="white-space: nowrap; vertical-align: bottom">&nbsp;</TD></TR>
  <TR STYLE="background-color: #CCEEFF">
    <TD STYLE="white-space: nowrap; vertical-align: bottom"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Increase in net tangible book value per share attributable to the offering </FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; vertical-align: top"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="white-space: nowrap; vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="white-space: nowrap; vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="white-space: nowrap; vertical-align: bottom">&nbsp;</TD></TR>
  <TR STYLE="background-color: white">
    <TD STYLE="padding-bottom: 1pt; vertical-align: bottom"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">As adjusted net tangible book value per share after giving effect to the offering</FONT></TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1pt; vertical-align: top">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; white-space: nowrap; vertical-align: bottom"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; padding-bottom: 1pt; white-space: nowrap; vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1pt; white-space: nowrap; vertical-align: bottom">&nbsp;</TD></TR>
  <TR STYLE="background-color: #CCEEFF">
    <TD STYLE="padding-bottom: 2.5pt; white-space: nowrap; vertical-align: bottom"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Dilution in net tangible book value per share to new investors </FONT></TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="padding-bottom: 2.5pt; vertical-align: top">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; white-space: nowrap; vertical-align: bottom"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="border-bottom: Black 2.5pt double; white-space: nowrap; vertical-align: bottom"></TD>
    <TD STYLE="padding-bottom: 2.5pt; white-space: nowrap; vertical-align: bottom">&nbsp;</TD></TR>
  </TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">If the underwriter exercises in full its option
to purchase additional shares of common stock and/or warrants in this offering, our net tangible book value as of September&nbsp;30, 2023,
calculated on the same basis as described above, would have been $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; million,
or $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; per share, representing an increase in the net tangible book value of $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;per
share, dilution to new investors purchasing securities in this offering of $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;per
share.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
number of shares of our common stock to be outstanding immediately after this offering is based on </FONT>38,565,836 shares of our common
stock outstanding as of September&nbsp;30, 2023, and excludes the following, in each case as of such date:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>708,000 shares of common stock issuable upon the vesting of outstanding restricted stock units;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>2,759,000 shares issuable upon the exercise of outstanding stock options with a weighted-average exercise price of $2.07 per share;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&bull;</TD><TD>491,000 shares of our common stock issuable upon exercise of outstanding stock options granted outside of our Equity Incentive Plans
at a weighted average exercise price of $1.65 per share;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>2,381,000 shares reserved for future issuances under the 2021 Equity Incentive Plan;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>189,000 shares reserved for future issuances under the 2021 Consultant Stock Plan;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&bull;</TD><TD>shares of our common stock issuable upon exercise of the warrants to be issued in this offering; and</TD></TR></TABLE>

<P STYLE="margin-top: 0; margin-bottom: 0">&nbsp;&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&bull;</TD><TD>shares of our common stock issuable upon exercise of the warrants to be issued to the underwriter in this offering.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">To the extent that any options are exercised, new
options are issued under our equity incentive plans, the warrants issued in this offering are exercised or we otherwise issue additional
shares of common stock in the future at a price less than the public offering price, there will be further dilution to new investors.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="a_004"></A>UNDERWRITING</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have entered into an underwriting agreement,
dated&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; , 2024, with Public Ventures, LLC, acting as
the sole book-running manager (sometimes referred to as the &ldquo;underwriter&rdquo;). Subject to the terms and conditions of the underwriting
agreement, the underwriter has agreed to purchase, and we have agreed to sell to it, the number of shares of common stock and warrants
listed next to its name at the public offering price, less the underwriting discounts and commissions, as set forth on the cover page&nbsp;of
this prospectus supplement and as indicated below:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="border-bottom: Black 1pt solid; width: 32%; font: bold 10pt Times New Roman, Times, Serif">Underwriter:</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif; width: 2%; padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; width: 32%; font: bold 10pt Times New Roman, Times, Serif; text-align: center">Number of Shares</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif; width: 2%; padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; width: 32%; font: bold 10pt Times New Roman, Times, Serif; text-align: center">Number of Warrants</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">Public Ventures, LLC</TD><TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD><TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD></TR>
  </TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The underwriting agreement provides that the obligations
of the underwriter to pay for and accept delivery of the shares of common stock and warrants offered by this prospectus supplement are
subject to various conditions and representations and warranties, including the approval of certain legal matters by its counsel and other
conditions specified in the underwriting agreement. The shares of common stock and warrants are offered by the underwriter, subject to
prior sale, when, as and if issued to and accepted by the underwriter. The underwriter reserves the right to withdraw, cancel or modify
the offer to the public and to reject orders in whole or in part. The underwriter is obligated to take and pay for all of the shares of
common stock and warrants offered by this prospectus supplement if any of the securities are taken.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have agreed to indemnify the underwriter and
certain of its affiliates and controlling persons (within the meaning of Section&nbsp;15 of the Securities Act or Section&nbsp;20 of the
Securities and Exchange Act of 1934, as amended), among others, against specified liabilities, including liabilities under the Securities
Act of 1933, as amended, and to contribute to payments the underwriter may be required to make in respect thereof.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Discounts and Commissions</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
underwriter proposes to sell the shares of common stock and warrants directly to the public at the public offering prices set forth on
the cover page&nbsp;of this prospectus supplement. The shares of common stock and warrants are being offered separately and not as a unit,
</FONT>but we expect that the underwriter will allocate purchases by investors in lots comprised of multiples of three shares of
common stock and one warrant.&nbsp;&nbsp;The public offering price per one share of common stock will be $[&#9679;] and one warrant will
be $[&#9679;]. After the offering to the public, the offering prices and other selling terms may be changed by the underwriter without
changing the proceeds we will receive from the underwriter. Any shares and warrants sold by the underwriter to securities dealers will
be sold at the public offering price less a selling concession not in excess of $[&#9679;] per share.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following table summarizes the public offering
price, underwriting commissions and proceeds before expenses to us. The underwriting discount is 8% of the gross proceeds received at
the closing of the offering from the sale of the securities in the offering. We have also agreed to pay an accountable expense allowance
to the underwriter not to exceed $125,000, including the fees and expenses of its U.S. legal counsel and for the underwriter&rsquo;s use
of Ipreo&rsquo;s book-building, prospectus tracking and compliance software for this offering.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Per Share</B></FONT></TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Per Warrant</B></FONT></TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Total Without <BR>
Over-Allotment <BR>
Option</B></FONT></TD>
    <TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Total With Full<BR>
Over-Allotment <BR>
Option</B></FONT></TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="background-color: #CCEEFF">
    <TD STYLE="vertical-align: bottom; width: 45%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Public offering price</FONT></TD>
    <TD STYLE="vertical-align: bottom; width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 1%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="vertical-align: bottom; width: 10%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 1%; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 1%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="vertical-align: top; width: 10%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 1%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="vertical-align: bottom; width: 13%; text-align: right">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 1%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="vertical-align: bottom; width: 13%; text-align: right">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 1%">&nbsp;</TD></TR>
  <TR STYLE="background-color: white">
    <TD STYLE="vertical-align: bottom"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Underwriting discounts and commissions (8%)</FONT></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD></TR>
  <TR STYLE="background-color: #CCEEFF">
    <TD STYLE="vertical-align: bottom"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Proceeds, before expenses, to us</FONT></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="vertical-align: bottom; text-align: right">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our
total estimated expenses of the offering, including registration, filing and listing fees, printing fees and legal and accounting expenses,
but excluding underwriting discounts and commissions, are approximately $</FONT>[&#9679;].</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Over-Allotment Option</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
have granted the underwriter an over-allotment option. This option, which is exercisable from time to time, for up to 45 days after
the date of this prospectus supplement, permits the underwriter to purchase up to an aggregate
of&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;additional shares of common stock, representing 15% of the shares of
common stock sold in the offering, or up to&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;additional shares of common
stock, representing 15% of the shares of common stock sold in the offering, and _____ warrants, representing 15% of the warrants
sold in the offering. The purchase price to be paid per additional share of common stock shall be equal to the public offering price
of one share of common stock equal to $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;, less the underwriting discount,
and the purchase price to be paid per additional warrant shall be
$</FONT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;, less the underwriting discount. The underwriter may exercise the over-allotment option with respect to shares of our common stock only or shares of our common stock and
accompanying warrants.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Underwriter&rsquo;s Warrants</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Upon
closing of this offering, we have agreed to issue to the underwriter, or its designees, as compensation warrants to purchase up to&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;shares
of common stock (or&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;shares of common stock assuming the underwriter&rsquo;s
over-allotment option is exercised in full), which is equal to </FONT>8% of the aggregate number of shares of common stock sold in this
offering (the &ldquo;Underwriter&rsquo;s Warrants&rdquo;). The Underwriter&rsquo;s Warrants will be exercisable at a per share exercise
price of $&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;, which is equal to 125% of the public offering price per one share
and one third of the public offering price of one warrant in this offering. The Underwriter&rsquo;s Warrants are exercisable at any time
and from time to time, in whole or in part, during the five year period after the date of the underwriting agreement, commencing 180 days
from the commencement of sales from this offering.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The Underwriter&rsquo;s Warrants have been deemed
compensation by FINRA and are therefore subject to a 180-day lock-up pursuant to FINRA Rule&nbsp;5110(e)(1). The underwriter (or permitted
assignees under Rule&nbsp;5110(e)(2)) will not sell, transfer, assign, pledge, or hypothecate these warrants or the securities underlying
these warrants, nor will they engage in any hedging, short sale, derivative, put, or call transaction that would result in the effective
economic disposition of the warrants or the underlying securities for a period of 180 days from the effective date of the registration
statement. In addition, the warrants provide for registration rights upon request, in certain cases. The one-time demand registration
right provided will not be greater than five years from the effective date of the registration statement in compliance with FINRA Rule&nbsp;5110(g)(8)(C).
The unlimited piggyback registration right provided will not be greater than seven years from the effective date of the registration statement
in compliance with FINRA Rule&nbsp;5110(g)(8)(D). We will bear all fees and expenses attendant to registering the securities issuable
on exercise of the warrants other than underwriting commissions incurred and payable by the holders. The exercise price and number of
shares issuable upon exercise of the warrants may be adjusted in certain circumstances including in the event of a stock dividend or our
recapitalization, reorganization, merger or consolidation. However, the warrant exercise price or underlying shares will not be adjusted
for issuances of shares of common stock at a price below the warrant exercise price.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Discretionary Accounts</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The underwriter does not intend to confirm sales
of the securities offered hereby to any accounts over which they have discretionary authority.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Lock-Up Agreements</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">We,
our executive officers and directors and clirSPV have agreed pursuant to &ldquo;lock-up&rdquo; agreements not to, or are subject to other
restrictions so that we/they may not, without the prior written consent of the underwriter, directly or indirectly, offer, sell, pledge
or otherwise transfer or dispose of any of shares of (or enter into any transaction or device that is designed to, or could be expected
to, result in the transfer or disposition by any person at any time in the future of) our common stock (or any securities convertible
into or exercisable or exchangeable for our common stock), enter into any swap or other derivatives transaction that transfers to another,
in whole or in part, any of the economic benefits or risks of ownership of shares of our common stock (or any securities convertible into
or exercisable or exchangeable for our common stock), make any demand for or exercise any right or cause to be filed a registration statement,
including any amendments thereto, with respect to the registration of any shares of common stock or securities convertible into or exercisable
or exchangeable for shares of our common stock or any other of our securities or publicly disclose the intention to do any of the foregoing,
subject to customary exceptions. The officer and director lock up is for a </FONT>6-month period commencing the closing of the offering.
The lock up for the Company and clirSPV is until December&nbsp;31, 2024; provided clirSPV may sell, into the public market only, shares
of common stock at such times as the net per share price at which they are sold exceeds two times the per share price in this offering
and the aggregate number of shares sold per day does not exceed 15% of the daily volume of the shares of common stock on that date.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Purchases by Affiliates</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><I>clirSPV Purchase Right</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In connection with a private placement of our common
stock, pursuant to a Stock Purchase Agreement dated July&nbsp;12, 2018, we granted to clirSPV a right to purchase certain new equity securities
that we sell for the purpose of raising capital on terms and conditions no different from those offered to other purchasers (the &ldquo;Purchase
Right&rdquo;). In no event, however, may this Purchase Right be exercised to the extent it would cause clirSPV to own 20% or more of the
Company&rsquo;s then outstanding shares of common stock or hold shares with 20% or more of the voting power of the Company.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Because certain elements of this Purchase Right,
such as the notice provisions and closing period, are not compatible with raising capital in a public offering, on May&nbsp;26, 2022,
clirSPC agreed to waive the notice requirements and other related closing mechanics for such Purchase Right (the &ldquo;Waiver&rdquo;).
In exchange for such Waiver, we and clirSPV LLC agreed that, following the closing of this offering, clirSPV LLC may purchase from us,
at the price sold to the investors in this offering, unregistered shares of our common stock and accompanying warrants in a number that
will allow it to maintain a 19.99% percentage ownership of our outstanding common stock, provided that clirSPV notifies us that it will
exercise such right within 30 days following the final closing of this offering and the completion of such purchase must occur within
six (6)&nbsp;business days of the final closing.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In addition, we and clirSPV agreed that effective
upon the Investor Holder Consent (as defined below), the Purchase Right, subject to the Waiver and modification contained therein, would
be extended from December&nbsp;31, 2023, to such date that the holders of two-thirds of the outstanding units of clirSPV agree (the &ldquo;Investor
Holder Consent&rdquo;) to extend such holder&rsquo;s existing agreement that he/she/it will have no right to force a redemption of his/her/its
interests in clirSPV; provided, however, that clirSPV provides written notice to us of the Investor Holder Consent prior to December&nbsp;31,
2023 and the Purchase Right would in no event extend beyond June&nbsp;30, 2027.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">On December&nbsp;30, 2023, we received notice from
clirSPV that the holders of at least two-thirds of the outstanding units of clirSPV agreed to extend the waiver of the Redemption Right
until December&nbsp;31, 2024. Accordingly, the Purchase Right will now expire on December&nbsp;31, 2024.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Robert T. Hoffman Sr., a member of our board of
directors, is the managing member of GPclirSPV LLC, which is the managing member of clirSPV.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Price Stabilization, Short Positions and Penalty Bids</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In order to facilitate the offering of our securities,
the underwriter may engage in transactions that stabilize, maintain or otherwise affect the price of our securities. In connection with
the offering, the underwriter may purchase and sell our securities in the open market. These transactions may include short sales, purchases
on the open market to cover positions created by short sales and stabilizing transactions. Short sales involve the sale by the underwriter
of a greater number of securities than they are required to purchase in the offering. &ldquo;Covered&rdquo; short sales are sales made
in an amount not greater than the underwriter&rsquo;s option to purchase additional securities in the offering. The underwriter may close
out any covered short position by either exercising the over-allotment option to purchase securities or purchasing securities in the open
market. In determining the source of securities to close out the covered short position, the underwriter will consider, among other things,
the price of securities available for purchase in the open market as compared to the price at which they may purchase securities through
the over-allotment option to purchase securities. &ldquo;Naked&rdquo; short sales are sales in excess of the over-allotment option to
purchase securities. The underwriter must close out any naked short position by purchasing securities in the open market. A naked short
position is more likely to be created if the underwriter is concerned that there may be downward pressure on the price of our securities
in the open market after pricing that could adversely affect investors who purchase in the offering. Stabilizing transactions consist
of various bids for or purchases of securities made by the underwriter in the open market before the completion of the offering.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Similar to other purchase transactions, the underwriter&rsquo;s
purchases to cover the syndicate short sales may have the effect of raising or maintaining the market price of our securities or preventing
or retarding a decline in the market price of our securities. As result, the price of our securities may be higher than the price that
might otherwise exist in the open market.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The underwriter makes no representation or prediction
as to the direction or magnitude of any effect that the transactions described above may have on the price of our securities. In addition,
neither we nor the underwriter make any representation that the underwriter will engage in these transactions or that these transactions,
once commenced, will not be discontinued without notice.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Electronic Offer, Sale and Distribution of Securities</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">This prospectus supplement and accompanying base
prospectus in electronic format may be made available on the websites maintained by the underwriter or selling group members, if any,
participating in the offering. The underwriter may agree to allocate a number of securities to selling group members for sale to their
online brokerage account holders. Internet distributions will be allocated by the selling group members that may make internet distributions
on the same basis as other allocations. Other than this prospectus supplement and accompanying base prospectus in electronic format, the
information on the underwriter&rsquo;s or selling group member&rsquo;s website and any information contained in any other website maintained
by the underwriter or selling group member is not part of this prospectus supplement, accompanying base prospectus or the registration
statement of which this prospectus forms a part.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Other Relationships</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">From time to time, the underwriter and/or its affiliates
may provide in the future, various advisory, investment and commercial banking and other services to us in the ordinary course of business,
for which they will receive customary fees and commissions. However, except as disclosed in this prospectus, we have no present arrangements
with the underwriter or any of its affiliates for any further services.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Pricing of the Offering</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The terms and the public offering prices of the
securities offered hereby were determined by negotiations between us and the underwriter. Among the factors considered in determining
the public offering price were our future prospects and those of our industry in general, our sales, earnings and certain other financial
and operating information in recent periods, and the price-earnings ratios, price-sales ratios, market prices of our securities and the
securities of other public companies, market conditions, and certain financial and operating information of companies engaged in activities
similar to ours. Neither we nor the underwriter can assure investors that an active trading market for the securities will develop or
that, after the offering, the securities will trade in the public market at or above the public offering price.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Offer Restrictions Outside the United States</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Other than in the United States, no action has
been taken by us or the underwriter that would permit a public offering of the securities offered by this prospectus supplement and accompanying
base prospectus in any jurisdiction where action for that purpose is required. The securities offered by this prospectus supplement and
accompanying base prospectus may not be offered or sold, directly or indirectly, nor may this prospectus supplement and accompanying base
prospectus or any other offering material or advertisements in connection with the offer and sale of any such securities be distributed
or published in any jurisdiction, except under circumstances that will result in compliance with the applicable rules&nbsp;and regulations
of that jurisdiction. Persons into whose possession this prospectus comes are advised to inform themselves about and to observe any restrictions
relating to the offering and the distribution of this prospectus supplement and accompanying base prospectus. This prospectus supplement
and accompanying base prospectus does not constitute an offer to sell or a solicitation of an offer to buy any securities offered by this
prospectus in any jurisdiction in which such an offer or a solicitation is unlawful.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>Canada</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The securities may be sold in Canada only to purchasers
purchasing, or deemed to be purchasing, as principal that are accredited investors, as defined in National Instrument 45-106 Prospectus
Exemptions or subsection 73.3(1)&nbsp;of the Securities Act (Ontario), and are permitted clients, as defined in National Instrument 31-103
Registration Requirements, Exemptions and Ongoing Registrant Obligations. Any resale of the securities must be made in accordance with
an exemption from, or in a transaction not subject to, the prospectus requirements of applicable securities laws. Securities legislation
in certain provinces or territories of Canada may provide a purchaser with remedies for rescission or damages if this prospectus supplement
(including any amendment thereto) contains a misrepresentation, provided that the remedies for rescission or damages are exercised by
the purchaser within the time limit prescribed by the securities legislation of the purchaser&rsquo;s province or territory. The purchaser
should refer to any applicable provisions of the securities legislation of the purchaser&rsquo;s province or territory for particulars
of these rights or consult with a legal advisor.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="a_005"></A>LEGAL MATTERS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The validity of the issuance of the securities
offered hereby will be passed upon for us by Mitchell Silberberg&nbsp;&amp; Knupp LLP, New York, New York. Public Ventures, LLC is being
represented in connection with this offering by Golenbock Eiseman Assor Bell&nbsp;&amp; Peskoe LLP, New York, New York.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="a_006"></A>EXPERTS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
consolidated financial statements for ClearSign Technologies Corporation incorporated in this prospectus supplement by reference to our
<A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000155837023005285/clir-20221231x10k.htm" STYLE="-sec-extract: exhibit">Annual Report on Form&nbsp;10-K for the year ended December&nbsp;31, 2022</A> have been so incorporated in reliance on the report of BPM LLP,
an independent registered public accounting firm, </FONT>as set forth in their report thereon, included therein, and incorporated herein
by reference. Such consolidated financial statements are incorporated herein by reference in reliance upon such report given on the authority
of such firm as experts in accounting and auditing.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="a_007"></A>WHERE YOU CAN FIND MORE INFORMATION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have filed with the SEC a registration statement
on Form&nbsp;S-3, including exhibits, under the Securities Act of which this prospectus supplement and the accompanying prospectus forms
a part. This prospectus supplement does not contain all of the information set forth in the registration statement. This prospectus supplement
and the accompanying prospectus are a part of the registration statement but do not contain descriptions of certain agreements or documents
that are exhibits to the registration statement. The statements as to the contents of such exhibits, however, are brief descriptions and
are not necessarily complete, and each statement is qualified in all respects by reference to such agreement or document. For further
information about us, please refer to the registration statement and the documents incorporated by reference in this prospectus supplement
and the accompanying prospectus.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We file annual, quarterly and current reports,
proxy statements and other information with the SEC. Our SEC filings are available to the public over the Internet at the SEC&rsquo;s
website at http://www.sec.gov. The SEC&rsquo;s website contains reports, proxy statements and other information regarding issuers, such
as ClearSign Technologies Corporation, that file electronically with the SEC. We make available free of charge through our website our
Annual Report on Form&nbsp;10-K, Quarterly Reports on Form&nbsp;10-Q, Current Reports on Form&nbsp;8-K, Proxy Statements on Schedule 14A
and all amendments to those reports as soon as reasonably practicable after such material is electronically filed with or furnished to
the SEC. Our website address is http://www.clearsign.com. Please note that our website address is provided as an inactive textual reference
only. Information contained on or accessible through our website is not part of this prospectus supplement or the accompanying prospectus
and is therefore not incorporated by reference unless such information is otherwise specifically referenced elsewhere in this prospectus
supplement or the accompanying prospectus.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="a_008"></A>INFORMATION INCORPORATED BY REFERENCE</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The SEC allows us to &ldquo;incorporate by reference&rdquo;
into this prospectus supplement, and the accompanying prospectus, the information we have filed with the SEC, which means that we can
disclose important information to you by referring you to those documents. Any information that we file subsequently with the SEC will
automatically update this prospectus supplement and the accompanying prospectus. We incorporate by reference into this prospectus supplement,
and the accompanying prospectus, the information contained in the documents listed below, which is considered to be a part of this prospectus:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&bull;</TD><TD><A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000155837023005285/clir-20221231x10k.htm" STYLE="-sec-extract: exhibit">our Annual Report on Form&nbsp;10-K for the year ended December&nbsp;31, 2022, filed with the SEC on March&nbsp;31, 2023;</A></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&bull;</TD><TD>all information in our <A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837023006668/clir-20230606xdef14a.htm" STYLE="-sec-extract: exhibit">Definitive Proxy Statement on Schedule 14A filed with the SEC on April&nbsp;25, 2023</A> to the extent incorporated
by reference in our <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000155837023005285/clir-20221231x10k.htm" STYLE="-sec-extract: exhibit">Annual Report on Form&nbsp;10-K for the year ended December&nbsp;31, 2022</A>;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&bull;</TD><TD>our Quarterly Reports on Form&nbsp;10-Q for the quarters ended March&nbsp;31, 2023, filed with the SEC on <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000155837023009840/clir-20230331x10q.htm" STYLE="-sec-extract: exhibit">May&nbsp;15, 2023</A>, June&nbsp;30,
2023, filed with the SEC on <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000155837023014714/clir-20230630x10q.htm" STYLE="-sec-extract: exhibit">August&nbsp;14, 2023</A>, and September&nbsp;30, 2023, filed with the SEC on <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000155837023019018/clir-20230930x10q.htm" STYLE="-sec-extract: exhibit">November&nbsp;14, 2023</A>;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&bull;</TD><TD>with the exception of the portions of the following filings that are furnished rather than filed, our Current Reports on Form&nbsp;8-K
filed with the SEC on <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465923043159/tm2312141d1_8k.htm" STYLE="-sec-extract: exhibit">April&nbsp;7, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465923055099/tm2314455d1_8k.htm" STYLE="-sec-extract: exhibit">May&nbsp;2, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465923063815/tm2316656d1_8k.htm" STYLE="-sec-extract: exhibit">May&nbsp;24, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465923065626/tm2317143d1_8k.htm" STYLE="-sec-extract: exhibit">May&nbsp;30, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465923069394/tm2318286-1_8k.htm" STYLE="-sec-extract: exhibit">June&nbsp;8, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465923071426/tm2318661d1_8k.htm" STYLE="-sec-extract: exhibit">June&nbsp;15, 2023</A>,
<A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465923096559/tm2325053d1_8k.htm" STYLE="-sec-extract: exhibit">August&nbsp;29, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465923097793/tm2325390d1_8k.htm" STYLE="-sec-extract: exhibit">September&nbsp;1, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465923103180/tm2326075d1_8k.htm" STYLE="-sec-extract: exhibit">September&nbsp;22, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465923118741/tm2330860d1_8k.htm" STYLE="-sec-extract: exhibit">November&nbsp;15, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465923121296/tm2331617d1_8k.htm" STYLE="-sec-extract: exhibit">November&nbsp;27, 2023</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465924001822/tm242146d1_8k.htm" STYLE="-sec-extract: exhibit">January&nbsp;5, 2024</A> and <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465924011404/tm245403d1_8k.htm" STYLE="-sec-extract: exhibit">February&nbsp;7, 2024</A>;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">&bull;</TD><TD>the description of our common stock contained in <A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465920039929/tm205247d1_ex4-2.htm" STYLE="-sec-extract: exhibit">Exhibit&nbsp;4.2</A> to our Annual Report on Form&nbsp;10-K for the fiscal year ended
December&nbsp;31, 2022, filed with the SEC on March&nbsp;31, 2023, and any amendment or report filed for the purpose of updating such
description.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We also incorporate by reference all documents
we file under Sections 13(a), 13(c), 14 or 15(d)&nbsp;of the Exchange Act filed after the date of this prospectus supplement. The most
recent information that we file with the SEC automatically updates and supersedes older information. The information contained in any
such filing will be deemed to be a part of this prospectus, commencing on the date on which the document is filed.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Notwithstanding the statements in the preceding
paragraphs, no document, report or exhibit (or portion of any of the foregoing) or any other information that we have &ldquo;furnished&rdquo;
to the SEC pursuant to the Securities Exchange Act of 1934, as amended shall be incorporated by reference into this prospectus.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Upon written or oral request, we will provide to
each person, including any beneficial owner, to whom a prospectus is delivered, without charge, a copy of any or all of the documents
incorporated by reference, other than exhibits to those documents unless the exhibits are specifically incorporated by reference in the
documents. Please send requests to ClearSign Technologies Corporation, 8023 E. 63<SUP>rd</SUP> Place, Suite&nbsp;101, Tulsa, Oklahoma
74133, Attn: Brent Hinds, Telephone: (206) 673-4848.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Any statement contained in this prospectus supplement
or in a document incorporated or deemed to be incorporated by reference into this prospectus supplement will be deemed to be modified
or superseded for purposes of this prospectus supplement to the extent that a statement contained in this prospectus supplement or any
other subsequently filed document that is deemed to be incorporated by reference into this prospectus supplement modifies or supersedes
the statement. Any statement so modified or superseded will not be deemed, except as so modified or superseded, to constitute a part of
this prospectus supplement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">You should rely only on information contained in,
or incorporated by reference into, this prospectus supplement and the accompanying prospectus. We have not authorized anyone to provide
you with information different from that contained in this prospectus supplement and the accompanying prospectus or incorporated by reference
in this prospectus supplement and the accompanying prospectus. We are not making offers to sell the securities in any jurisdiction in
which such an offer or solicitation is not authorized or in which the person making such offer or solicitation is not qualified to do
so or to anyone to whom it is unlawful to make such offer or solicitation.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>PROSPECTUS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><IMG SRC="tm249031d1_424b5img02.jpg" ALT="" STYLE="height: 56px; width: 242px"></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>$50,000,000</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Debt Securities</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Common Stock</B>&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Preferred Stock</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Warrants</B>&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Units</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Subscription Rights</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">By this prospectus and an accompanying prospectus
supplement, we may from time to time offer and sell, in one or more offerings, up to $50,000,000 in any combination of debt securities,
common stock, preferred stock, warrants, units, or subscription rights.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We will provide you with more specific terms of
the securities offered by us in one or more supplements to this prospectus. You should read this prospectus and the applicable prospectus
supplement carefully before you invest.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We may offer these securities from time to time
in amounts, at prices and on other terms to be determined at the time of offering. We may offer and sell these securities to or through
underwriters, dealers or agents, or directly to investors, on a continuous or delayed basis.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The supplements to this prospectus will provide
the specific terms of the plan of distribution. The price to the public of the securities we offer and the net proceeds we expect to receive
from such sale will also be set forth in a prospectus supplement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our common stock is listed on the Nasdaq Capital
Market under the symbol &ldquo;CLIR&rdquo;. On July&nbsp;22, 2022, the closing price of our common stock as reported by the Nasdaq Capital
Market was $1.11 per share.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The aggregate market value of shares of our common
stock held by non-affiliates, as of the date hereof pursuant to General Instruction of I.B.6 of Form&nbsp;S-3 is $40,549,684, which was
calculated based on 30,036,803 shares of our common stock outstanding held by non-affiliates and at a price of $1.35 per share, the closing
price of our common stock on June&nbsp;3, 2022. During the 12 calendar month period that ends on, and includes, the date of this prospectus,
we have offered or sold $4,646,460 of securities pursuant to General Instruction I.B.6. of Form&nbsp;S-3, which excludes $8.7 million
of our shares of common stock issuable pursuant to the At-the-Market Sales Agreement we previously entered into with Virtu Americas LLC.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B><I>An investment in our securities may be considered
speculative and involves a high degree of risk, including the risk of a substantial loss of your investment. See &ldquo;Risk Factors&rdquo;
on page&nbsp;7 for more information on the risks you should consider before buying our securities. An investment in our securities is
not suitable for all investors.</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B>Neither the Securities and Exchange Commission
nor any state securities commission has approved or disapproved of these securities, or passed upon the adequacy or accuracy of this prospectus.
Any representation to the contrary is a criminal offense.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>The date of this prospectus is August&nbsp;12,
2022</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>TABLE OF CONTENTS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 94%"></TD>
    <TD STYLE="border-bottom: Black 1pt solid; width: 6%; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Page</B></FONT></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#b_001"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">ABOUT THIS PROSPECTUS</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_001"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">1</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD><A HREF="#b_002"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">MARKET,&nbsp;INDUSTRY AND OTHER DATA</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_002"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">1</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#b_003"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_003"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">1</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD><A HREF="#b_004"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">OUR BUSINESS</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_004"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">3</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#b_005"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">RISK FACTORS</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_005"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD><A HREF="#b_006"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">USE OF PROCEEDS</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_006"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#b_007"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">DILUTION</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_007"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD><A HREF="#b_008"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">DESCRIPTION OF SECURITIES THAT MAY&nbsp;BE OFFERED</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_008"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">6</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 0.1in"><A HREF="#b_009"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Description of Debt Securities</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_009"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">6</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 0.1in"><A HREF="#b_010"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Description of Common Stock</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_010"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">13</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 0.1in"><A HREF="#b_011"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Description of Preferred Stock</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_011"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">16</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 0.1in"><A HREF="#b_012"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Description of Warrants</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_012"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">16</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-left: 0.1in"><A HREF="#b_013"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Description of Units</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_013"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">17</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="padding-left: 0.1in"><A HREF="#b_014"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Description of Subscription Rights</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_014"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">18</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#b_015"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">PLAN OF DISTRIBUTION</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_015"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">19</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD><A HREF="#b_016"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">LEGAL MATTERS</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_016"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">21</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#b_017"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">EXPERTS</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_017"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">21</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD><A HREF="#b_018"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">WHERE YOU CAN FIND MORE INFORMATION</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_018"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">22</FONT></A></TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD><A HREF="#b_019"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">INFORMATION INCORPORATED BY REFERENCE</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#b_019"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">23</FONT></A></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="b_001"></A>ABOUT THIS PROSPECTUS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">This prospectus is part of a registration statement
filed with the Securities and Exchange Commission (the &ldquo;SEC&rdquo;) using a &ldquo;shelf&rdquo; registration process. Under this
shelf process, we may sell the securities described in this prospectus in one or more offerings. This prospectus provides you with a general
description of the securities that may be offered. Each time we offer securities for sale, we will provide a prospectus supplement that
contains specific information about the terms of that offering. Any prospectus supplement may also add or update information contained
in this prospectus. You should read both this prospectus and any prospectus supplement together with additional information described
below under &ldquo;Where You Can Find More Information&rdquo; and &ldquo;Information Incorporated by Reference.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The registration statement that contains this prospectus
(including the exhibits thereto) contains additional important information about us and the securities we may offer under this prospectus.
Specifically, we have filed certain legal documents that establish the terms of the securities offered by this prospectus as exhibits
to the registration statement. We will file certain other legal documents that establish the terms of the securities offered by this prospectus
as exhibits to reports we file with the SEC. You may obtain copies of the registration statement and the other reports and documents referenced
herein as described below under the heading &ldquo;Where You Can Find More Information.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">You should rely only on the information contained
or incorporated by reference in this prospectus and in any prospectus supplement. We have not authorized any other person to provide you
with different information. If anyone provides you with different or inconsistent information, you should not rely on it. We are not making
offers to sell or solicitations to buy the securities in any jurisdiction in which an offer or solicitation is not authorized or in which
the person making that offer or solicitation is not qualified to do so or to anyone to whom it is unlawful to make an offer or solicitation.
You should not assume that the information in this prospectus or any prospectus supplement, as well as the information we file or previously
filed with the SEC that we incorporate by reference in this prospectus or any prospectus supplement, is accurate as of any date other
than the date of such document. Our business, financial condition, results of operations and prospects may have changed since those dates.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In this prospectus, unless the context otherwise
requires, references to &ldquo;ClearSign,&rdquo; &ldquo;we,&rdquo; &ldquo;us,&rdquo; &ldquo;our&rdquo; or the &ldquo;Company&rdquo; refer
to ClearSign Technologies Corporation and its subsidiary, ClearSign Asia Limited.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="b_002"></A>MARKET,&nbsp;INDUSTRY AND OTHER DATA</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">This prospectus, including the information incorporated
by reference, contains estimates, projections and other information concerning our industry, our business, and the markets for certain
products and services, including data regarding the estimated size of those markets and their projected growth rates. Information that
is based on estimates, forecasts, projections or similar methodologies is based on a number of assumptions and is inherently subject to
uncertainties, including those described in &ldquo;Risk Factors&rdquo; and elsewhere in this prospectus and documents incorporated by
reference in this prospectus, and actual events or circumstances may differ materially from events and circumstances reflected in this
information. You are cautioned not to give undue weight to such estimates, projections and other information.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="b_003"></A>DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">This prospectus and any accompanying
prospectus supplement, including the documents that we incorporate by reference, may contain forward-looking statements within the meaning
of Section&nbsp;27A of the Securities Act of 1933, as amended (the &ldquo;Securities Act&rdquo;), and Section&nbsp;21E of the Securities
Exchange Act of 1934, as amended (the &ldquo;Exchange Act&rdquo;).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">Forward-looking statements
in this prospectus and any accompanying prospectus supplement include, without limitation, statements related to our plans, strategies,
objectives, expectations, intentions and adequacy of resources. Investors are cautioned that such forward-looking statements involve risks
and uncertainties. Factors that could cause actual results to differ from those discussed in the forward-looking statements include, but
are not limited to:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">our limited cash, history of losses, and our expectation that we will continue to experience operating
losses and negative cash flows in the near future;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">our limited operating history;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">emerging competition and advancing technology in our industry that may outpace our technology;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">changes in government regulations that could substantially reduce, or even eliminate, the need for our
technology;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">customer demand for the products and services we develop;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">the impact of competitive or alternative products, technologies, and pricing;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">our ability to manufacture any products we design;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">our doing business in China and related risks with respect to intellectual property protection, currency
exchange, contract enforcement and rules&nbsp;on foreign investment;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">the impact of a cybersecurity incident or other technology disruption;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">our ability to protect our intellectual property;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">our ability to obtain adequate financing in the future;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">our ability to retain and hire personnel with the experience and talent to develop our products and business;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">general economic conditions and events and the impact they may have on us and our potential customers;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">lawsuits, investigations, and other claims by third parties or regulatory agencies, including but not
limited to, the Securities and Exchange Commission,&nbsp;Internal Revenue Service, Financial Industry Regulatory Authority;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">the financial and operational impacts of the corona virus pandemic on our business and results of operations,
including impacts on our day-to-day operations, collaborative arrangements, revenue and marketing efforts and suppliers; and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">our success at managing the risks involved in the foregoing items.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In some cases, you can identify forward-looking
statements by terminology such as &ldquo;may,&rdquo; &ldquo;will,&rdquo; &ldquo;should,&rdquo; &ldquo;could,&rdquo; &ldquo;expects,&rdquo;
 &ldquo;plans,&rdquo; &ldquo;intends,&rdquo; &ldquo;anticipates,&rdquo; &ldquo;believes,&rdquo; &ldquo;estimates,&rdquo; &ldquo;predicts,&rdquo;
 &ldquo;potential,&rdquo; or &ldquo;continue&rdquo; or the negative of such terms or other comparable terminology. Although we believe
that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee future results, levels of activity,
performance or achievements. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as
of the date hereof. We do not undertake any obligation to publicly update or review any forward-looking statement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="b_004"></A>OUR BUSINESS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>This is only a summary and may not contain all
the information that is important to you. You should carefully read both this prospectus and any accompanying prospectus supplement and
any other offering materials, together with the additional information described under the heading &ldquo;Where You Can Find More Information.&rdquo;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>About ClearSign Technologies Corporation</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">We design and develop
technologies to significantly improve key performance characteristics of industrial combustion systems, including emission and operational
performance, energy efficiency, safety and overall cost-effectiveness. We believe that our patented ClearSign Core&trade; technology can
enhance the performance of combustion systems in a broad range of markets, including the energy (upstream oil production and down-stream
refining), institutional, commercial and industrial boiler, chemical, and petrochemical industries. Our ClearSign Core technology, which
is our primary technology, uses either a porous ceramic structure or metal flame holder device held at a distance from the injection planes
of a burner to significantly reduce flame length and achieve low emissions without the need for external flue gas recirculation, selective
catalytic reduction, or high excess air systems. To date, our operations have been funded primarily through sales of our equity securities.
We have earned nominal revenue since inception in 2008.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Our combustion technology
has been successfully deployed in commercial projects such as down-stream refining, upstream oil production and industrial boiler installations.
These applications include both our process burner and boiler burner technologies. Our process burner technology is able to operate in
high-intensity multiple burner industrial applications at sites that are required to meet low air pollutant emissions. Our boiler burner
technology, which is designed to result in lower air pollutant emissions, has been deployed in the US and is currently undergoing commercialization
in China.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">With respect to our China
operations, we have a satellite office located in Beijing, China to support our commercialization efforts. At this time, these operations
in China are immaterial compared to total company operations. As of March&nbsp;31, 2022, our China asset balance totaled $227 thousand,
or approximately 2.6% compared to our total asset balance of $8,644 thousand.&nbsp;&nbsp;During the year ended December&nbsp;31, 2021,
revenues attributable to our China operations were $21 thousand, or approximately 3.4% compared to our total revenues of $607 thousand.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">We believe that combustion
equipment utilizing ClearSign Core technology is more effective and cost-efficient than current industry-standard air pollution control
technologies, which reduce NOx down to the levels required by new emission regulations. NOx is a regulated greenhouse gas pollutant comprised
of nitrogen oxide and nitrogen dioxide. These current technologies include selective catalytic reduction devices (SCRs), low- and ultra-low
NOx burners, external flue gas recirculation systems and other similar technologies. Such air pollution control systems are widely used
in places within our current target markets such as in petroleum refining and petrochemical process heaters, large-scale once through
steam generators (OTSGs), enclosed flares, institutional commercial and industrial boilers and other similar equipment. We believe that
our ClearSign Core technology can provide value to our customers not only by helping them meet current and possible future legislative
mandates to reduce pollutant emissions, but also by improving operating efficiency and increasing overall return on investment.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">We are also designing
and commercializing a range of sensing products called the ClearSign Eye<SUP>TM</SUP> for two potential markets. The primary addressable
market is similar to that of our ClearSign Core technology, although not limited to regions requiring emissions reduction. The flame sensing
products are applicable to all installed burners that use a pilot for ignition, including in markets and regions beyond those where reducing
emissions is a high priority. Like our burner technology, our burner sensing technology is being developed to provide convenient replacement
and retrofit solutions for existing equipment as well as for inclusion in newly built equipment. We expect our flame sensing technology
products to eventually replace existing flame sensing technology over time.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">The secondary potential
market for our sensing technology is outside of the typical combustion industry and includes transportation industries. While we believe
the use of this technology in applications intended for transportation markets is proven, the development and refinement of specific products,
obtaining the certifications required for commercial deployment and establishing an efficient manufacturing source and channels to market
will take some time, and we cannot assure that these goals will be achieved. We believe that the opportunities for application of our
sensing technology in the transportation market are global and of great value, but it will also take longer to commercialize products
targeted for this market for the reasons stated above.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
</div>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Overall, our sensing technologies
could provide future diversification as well as the opportunity for continued business expansion and growth beyond the maturation of our
combustion-related businesses.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Our Industry</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The combustion and emissions control systems markets
are significant, both with respect to the wide array of industries in which the systems are used and the amount of capital spent installing
and upgrading the systems. Combustion systems are used to provide heat for many different industrial and commercial processes, including
boilers, petrochemical process heaters, and waste disposal systems. In order to maximize energy efficiency while keeping pace with regulatory
guidelines for air pollution emissions, operators of combustion systems are continually installing, maintaining, and upgrading a variety
of costly process control, air pollution control and monitoring systems. Although we believe that there are many potential markets for
our ClearSign Core technology, to date we have limited the introduction of this technology to petroleum refining process heaters, energy
infrastructure process heaters, boilers for steam and hot water generation, boilers for building heating systems, and enclosed flares.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Recent Developments</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">On May&nbsp;24, 2022, the Company announced that
it was awarded a government grant through the Small Business Innovative Research (SBIR) program with the Department of Energy.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The project and funding occur in phases, with an
initial funding amount of approximately $250,000. The project will last six months and started in July&nbsp;2022. If needed, and upon
completion of Phase 1 of the project, the Company will be able to submit a follow-up proposal to continue the development work with a
Phase 2 grant. The Phase 2 grant funding can be up to $1.6 million for a two-year duration.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Additional Information</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">For a description of our business, financial condition,
results of operations and other important information regarding us, we refer you to our filings with the SEC incorporated by reference
in this prospectus supplement. For instructions on how to find copies of these documents, see &ldquo;Where You Can Find More Information.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Corporate Information</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our facilities and executive offices are located
at 8023 E. 63<SUP>rd</SUP> Pl, Suite&nbsp;101, Tulsa, Oklahoma 74133, and our telephone number is (206) 673-4848. We were incorporated
in Washington on January&nbsp;23, 2008. Additional information about us is available on our website at www.clearsign.com. The information
contained on or that may be obtained from our website is not, and shall not be deemed to be, a part of this prospectus. Our common stock,
par value $0.0001 per share, is currently traded on the Nasdaq Capital Market under the ticker symbol &ldquo;CLIR.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
</div>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="b_005"></A>RISK FACTORS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Investing in our common stock involves a high
degree of risk. Please see the risk factors set forth below and in Part&nbsp;I,&nbsp;Item 1A of our most recent Annual Report on Form&nbsp;10-K
and Part&nbsp;II, and other filings we make with the SEC, including our most recent Quarterly Report on Form&nbsp;10-Q, which are incorporated
by reference in this prospectus. Additional risk factors may be included in a prospectus supplement relating to a particular offering
of securities. Before making an investment decision, you should carefully consider these risks as well as other information we include
or incorporate by reference in this prospectus. These risks could materially affect our business, results of operations or financial condition
and cause the value of our securities to decline.</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="b_006"></A>USE OF PROCEEDS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Unless we state otherwise in an accompanying prospectus
supplement, we intend to use the net proceeds from the sale of the securities offered by us under this prospectus and any related prospectus
supplement for general corporate purposes. These purposes may include capital expenditures, acquisitions and additions to working capital.
When a particular offering of securities is made, the prospectus supplement relating to that offering will set forth our intended use
of the net proceeds we receive from the sale of the securities. Pending the application of the net proceeds, we may invest the proceeds
in short-term, interest-bearing instruments or other investment-grade securities.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="b_007"></A>DILUTION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">With the exception of debt securities we may sell
with no equity conversion feature and, therefore, no effect on dilution, we will set forth in a prospectus supplement the following information
regarding any material dilution of the equity interests of investors purchasing securities sold by ClearSign in an offering under this
prospectus:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the net tangible book value per share of our equity securities before and after the offering;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the amount of the increase in such net tangible book value per share attributable to the cash payments made by purchases in the offering;
and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the amount of the immediate dilution from the public offering price which will be absorbed by such purchasers.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="b_008"></A>DESCRIPTION OF THE SECURITIES THAT MAY&nbsp;BE
OFFERED</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="b_009"></A>Description of Debt Securities</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following description, together with the additional
information we include in any applicable prospectus supplement, summarizes certain general terms and provisions of the debt securities
that we may offer under this prospectus. When we offer to sell a particular series of debt securities, we will describe the specific terms
of the series in a supplement to this prospectus. The supplement will also indicate to what extent the general terms and provisions described
in this prospectus apply to a particular series of debt securities.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We may issue debt securities, either separately,
or together with, or upon the conversion or exercise of or in exchange for, other securities described in this prospectus. Debt securities
may be our senior, senior subordinated or subordinated obligations, issued in one or more series, and, unless otherwise specified in a
supplement to this prospectus, the debt securities will be our direct, unsecured obligations.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The debt securities will be issued under an indenture
between us and a trustee to be identified in the applicable prospectus supplement. We have summarized select portions of the indenture
below. Please note, however, that the summary below is not complete. The form of the indenture has been filed as an exhibit to the registration
statement of which this prospectus forms a part and you should read the indenture for provisions that may be important to you. Capitalized
terms used in the summary below and not defined herein have the meanings specified in the form of the indenture.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>General</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The terms of each series of debt securities will
be established by or pursuant to a resolution of our board of directors and set forth or determined in the manner provided in a resolution
of our board of directors, in an officer&rsquo;s certificate, or by a supplemental indenture. The particular terms of each series of debt
securities will be described in a prospectus supplement relating to such series (including any pricing supplement or term sheet).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We can issue an unlimited amount of debt securities
under the indenture that may be in one or more series with the same or various maturities, at par, at a premium, or at a discount. The
prospectus supplement (including any pricing supplement or term sheet) relating to any series of debt securities being offered will set
forth the aggregate principal amount and the other terms of the debt securities, including, if applicable:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the title and ranking of the debt securities (including the terms of any subordination provisions);</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the price or prices at which the debt securities will be sold;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any limit on the aggregate principal amount of the debt securities;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the date or dates on which the principal of and premium, if any, on the debt securities is payable and/or the method of determination
thereof;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the rate or rates (which may be fixed or variable) per annum or the method used to determine the rate or rates (including any commodity,
commodity index, stock exchange index or financial index) at which the debt securities will bear interest, the date or dates from which
interest will accrue, the date or dates on which interest will commence and be payable and any regular record date for the interest payable
on any interest payment date;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the place or places where principal of, and interest, if any, on the debt securities will be payable (and the method of such payment),
where the securities of such series may be surrendered for registration of transfer or exchange, and where notices and demands to us in
respect of the debt securities may be delivered;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the right, if any, to extend the interest payment periods and the duration of such extension;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the period or periods within which, the price or prices at which, and the terms and conditions upon which, we may redeem the debt
securities;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any obligation we will have to redeem or purchase the debt securities pursuant to any sinking fund or analogous provisions (including
payments made in cash in participation of future sinking fund obligations) or at the option of a holder of debt securities, and the period
or periods within which (or manner of determining the same), the price or prices at which (or manner of determining the same), and the
terms and conditions upon which, debt securities of the series shall be redeemed or purchased, in whole or in part, pursuant to such obligation;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the dates on which, and the price or prices at which, we will repurchase debt securities at the option of the holders of debt securities
and other detailed terms and provisions of these repurchase obligations;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the form of the debt securities of the series, including the form of the trustee&rsquo;s certificate of authentication for such series
and any legends or endorsements to be placed thereon;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the denominations in which the debt securities will be issued, if other than denominations of $1,000 and any integral multiple thereof;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>whether the debt securities will be issued in the form of certificated debt securities or global debt securities;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the portion of principal amount of the debt securities payable upon declaration of acceleration of the maturity date, if other than
the principal amount;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the currency of denomination of the debt securities, which may be United States dollars or any foreign currency, and if such currency
of denomination is a composite currency, the agency or organization, if any, responsible for overseeing such composite currency;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the designation of the currency, currencies or currency units in which payment of principal of, premium, if any, and interest on the
debt securities will be made;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>if payments of principal of, or premium, if any, or interest on the debt securities will be made in one or more currencies or currency
units other than that or those in which the debt securities are denominated, the manner in which the exchange rate with respect to these
payments will be determined;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the manner in which the amounts of payment of principal of, premium, if any, or interest on the debt securities will be determined,
if these amounts may be determined by reference to an index based on a currency or currencies other than that in which the debt securities
are denominated or designated to be payable or by reference to a commodity, commodity index, stock exchange index or financial index;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any provisions relating to any security provided for the debt securities;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any addition to, deletion of or change in the Events of Default described in this prospectus or in the indenture with respect to the
debt securities and any change in the acceleration provisions described in this prospectus or in the indenture with respect to the debt
securities;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any addition to, deletion of or change in the covenants described in this prospectus or set forth in the indenture with respect to
the debt securities;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the provisions, if any, relating to conversion or exchange of any debt securities of such series, including if applicable, the conversion
or exchange price and period, provisions as to whether conversion or exchange will be mandatory, the events requiring an adjustment of
the conversion or exchange price and provisions affecting conversion or exchange;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>if other than the trustee, the identity of the trustee, the registrar, paying agent and custodian for the depositary;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>if other than The Depository Trust Company, the identity of the depositary; and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any other terms of the debt securities, which may supplement, modify or delete any provision of the indenture as it applies to that
series, including any terms that may be required under applicable law or regulations or advisable in connection with the marketing of
the securities.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We may issue debt securities that provide for an
amount less than their stated principal amount to be due and payable upon declaration of acceleration of their maturity pursuant to the
terms of the indenture. Information on the federal income tax considerations and other special considerations applicable to any of these
debt securities will be provided in the applicable prospectus supplement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">If the purchase price of any of the debt securities
is denominated in a foreign currency or currencies or a foreign currency unit or units, or if the principal of and any premium and interest
on any series of debt securities is payable in a foreign currency or currencies or a foreign currency unit or units, then information
on the restrictions, elections, general tax considerations, specific terms and other information with respect to that issue of debt securities
and such foreign currency or currencies or foreign currency unit or units will be provided in the applicable prospectus supplement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>Transfer and Exchange</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Each debt security will be represented by either
one or more global securities registered in the name of The Depository Trust Company (which we refer to as &ldquo;DTC&rdquo;) or a nominee
of DTC (which we refer to as a &ldquo;book-entry debt security&rdquo;), or a certificate issued in definitive registered form (which is
referred to as a &ldquo;certificated debt security&rdquo;), as set forth in the applicable prospectus supplement. Except as set forth
under the heading &ldquo;Global Debt Securities and Book-Entry System&rdquo; below, book-entry debt securities will not be issuable in
certificated form.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><I>Certificated
Debt Securities</I></B></FONT>. Holders may transfer or exchange certificated debt securities at any office we maintain for this purpose
in accordance with the terms of the indenture. No service charge will be made for any transfer or exchange of certificated debt securities,
but payment of a sum sufficient to cover any tax or other governmental charge payable in connection with a transfer or exchange may be
required.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Holders may effect the transfer of certificated
debt securities and the right to receive the principal of, or any premium or interest on, certificated debt securities only by surrendering
the certificate representing those certificated debt securities and either reissuance by us or the trustee of the certificate to the new
holder or the issuance by us or the trustee of a new certificate to the new holder.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><I>Global
Debt Securities and Book-Entry System</I></B></FONT>. Each global debt security representing book-entry debt securities will be deposited
with, or on behalf of, DTC, and registered in the name of DTC or a nominee of DTC.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>Covenants</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Any restrictive covenants applicable to any issue
of debt securities will be set forth in the applicable prospectus supplement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>No Protection in the Event of a Change of Control</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Unless stated otherwise in the applicable prospectus
supplement, the debt securities will not contain any provisions that may afford holders of the debt securities protection in the event
we have a change in control or in the event of a highly leveraged transaction (whether or not such transaction results in a change in
control) that could adversely affect holders of debt securities.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>Consolidation, Merger and Sale of Assets</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We may not consolidate with or merge with or into,
or convey, transfer or lease all or substantially all of our properties and assets to any person (a &ldquo;successor person&rdquo;) unless:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>we are the surviving corporation or the successor person (if other than us) is a corporation that is organized and validly existing
under the laws of any U.S. domestic jurisdiction and expressly assumes our obligations on the debt securities and under the indenture;
and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>immediately after giving effect to the transaction, no Default or Event of Default shall have occurred and be continuing. Notwithstanding
the above, our subsidiaries may consolidate with, merge into, or transfer all or part of its properties to us.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>Events of Default</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&ldquo;Event of Default&rdquo; means with respect
to any series of debt securities, any of the following:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>default in the payment of any interest upon any debt security of that series when it becomes due and payable, and continuance of such
default for a period of 30 days (unless the entire amount of the payment is deposited by us with the trustee or with a paying agent prior
to the expiration of the 30-day period;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>default in the payment of principal of any security of that series when it becomes due and payable, whether at stated maturity, upon
redemption, upon purchase, upon acceleration or otherwise;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>default in the performance or breach of any other covenant or warranty by us in the indenture (other than a covenant or warranty that
has been included in the indenture solely for the benefit of a series of debt securities other than that series), which default continues
uncured for a period of 60 days after we receive written notice from the trustee, or we and the trustee receive written notice from the
holders of not less than a majority in principal amount of the outstanding debt securities of that series as provided in the indenture;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>certain voluntary or involuntary events of bankruptcy, insolvency or reorganization of the Company; and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any other Event of Default provided with respect to debt securities of that series that is described in the applicable prospectus
supplement.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">No Event of Default with respect to a particular
series of debt securities (except as to certain events of bankruptcy, insolvency or reorganization) necessarily constitutes an Event of
Default with respect to any other series of debt securities. The occurrence of certain Events of Default or an acceleration under the
indenture may constitute an event of default under certain other of our indebtedness or indebtedness of our subsidiaries outstanding from
time to time.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">So long as any of the securities are outstanding,
we will provide the trustee written notice of any Default or Event of Default within 30 days of becoming aware of the occurrence of such
Default or Event of Default.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">If an Event of Default with respect to debt securities
of any series at the time outstanding occurs and is continuing, then the trustee or the holders of not less than a majority in principal
amount of the outstanding debt securities of that series may, by a notice in writing to us (and to the trustee if given by the holders),
declare to be due and payable immediately the principal of (or, if the debt securities of that series are discount securities, that portion
of the principal amount as may be specified in the terms of that series) and accrued and unpaid interest, if any, on all debt securities
of that series. Such acceleration will not be effective until the earlier of (1)&nbsp;the acceleration of indebtedness under our senior
secured credit facilities or (2)&nbsp;five business days after receipt by us of written notice of such acceleration, at which time the
principal, premium, if any, interest and any other monetary obligations on all the then outstanding series of debt securities will become
due and payable immediately. In the case of an Event of Default resulting from certain events of bankruptcy, insolvency or reorganization,
the principal (or such specified amount) and accrued and unpaid interest, if any, on all outstanding debt securities or the applicable
series will become and be immediately due and payable without any declaration or other act on the part of the trustee or any holder of
outstanding debt securities. At any time after a declaration of acceleration with respect to debt securities of any series has been made,
but before a judgment or decree for payment of the money due has been obtained by the trustee, the holders of a majority in principal
amount of the outstanding debt securities of that series may rescind and annul the acceleration if all Events of Default, other than the
non-payment of accelerated principal and interest, if any, with respect to debt securities of that series, have been cured or waived as
provided in the indenture. Please refer to the prospectus supplement relating to any series of debt securities that are discount securities
for the particular provisions relating to acceleration of a portion of the principal amount of such discount securities upon the occurrence
of an Event of Default.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The indenture will provide that the trustee will
be under no obligation to exercise any of its rights or powers under the indenture unless the trustee receives indemnity satisfactory
to it against any cost, liability or expense which might be incurred by it in exercising such right of power. Subject to certain rights
of the trustee, the holders of a majority in principal amount of the outstanding debt securities of any series will have the right to
direct the time, method and place of conducting any proceeding for any remedy available to the trustee or exercising any trust or power
conferred on the trustee with respect to the debt securities of that series.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">No holder of any debt security of any series will have any right to
institute any proceeding, judicial or otherwise, with respect to the indenture or for the appointment of a receiver or trustee, or for
any remedy under the indenture, unless:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>that holder has previously given to the trustee written notice of a continuing Event of Default with respect to debt securities of
that series; and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the holders of not less than a majority in principal amount of the outstanding debt securities of that series have made written request,
and offered indemnity or security satisfactory to the trustee, to the trustee to institute the proceeding as trustee, and the trustee
has not received from the holders of not less than a majority in principal amount of the outstanding debt securities of that series a
direction inconsistent with that request and has failed to institute the proceeding within 60 days.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Notwithstanding any other provision in the indenture,
the holder of any debt security will have an absolute and unconditional right to receive payment of the principal of, premium and any
interest on that debt security on or after the due dates expressed in that debt security and to institute suit for the enforcement of
payment.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The indenture requires us, within 120 days after
the end of our fiscal year, to furnish to the trustee a statement as to compliance with the indenture. If a Default or Event of Default
occurs and is continuing with respect to the debt securities of any series and if it is known to a responsible officer of the trustee,
the trustee shall mail to each holder of the debt securities of that series notice of a Default or Event of Default within 90 days after
it occurs. The indenture provides that the trustee may withhold notice to the holders of debt securities of any series of any Default
or Event of Default (except in payment on any debt securities of that series) with respect to debt securities of that series if the trustee
determines in good faith that withholding notice is in the interest of the holders of those debt securities.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>Modification and Waiver</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We and the trustee may modify, amend or supplement
the indenture or the debt securities of any series without the consent of any holder of any debt security:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>to cure any ambiguity, defect or inconsistency;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>to comply with covenants in the indenture described above under the heading &ldquo;Consolidation, Merger and Sale of Assets&rdquo;;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>to provide for uncertificated securities in addition to or in place of certificated securities;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>to make any change that does not adversely affect the rights of any holder of debt securities;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>to provide for the issuance of and establish the form and terms and conditions of debt securities of any series as permitted by the
indenture;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>to add covenants for the benefit of the holders of debt securities of any series or to surrender any right or power conferred upon
the Company;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>to effect the appointment of a successor trustee with respect to the debt securities of any series and to add to or change any of
the provisions of the indenture to provide for or facilitate administration by more than one trustee; or</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>to comply with requirements of the SEC in order to effect or maintain the qualification of the indenture under the Trust Indenture
Act of 1939, as amended.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We may also modify and amend the indenture with
the consent of the holders of at least a majority in principal amount of the outstanding debt securities of each series affected by the
modifications or amendments. We may not make any modification or amendment without the consent of the holders of each affected debt security
then outstanding if that amendment will:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>reduce the amount of debt securities whose holders must consent to an amendment, supplement or waiver;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>reduce the rate of or extend the time for payment of interest (including default interest) on any debt security;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>reduce the principal of or premium on or change the fixed maturity of any debt security or reduce the amount of, or postpone the date
fixed for, the payment of any sinking fund or analogous obligation with respect to any series of debt securities;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>reduce the principal amount of discount securities payable upon acceleration of maturity;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">waive a default in the payment of the principal, premium or interest on any debt security (except a rescission
of acceleration of the debt securities of any series by the holders of at least a majority in aggregate principal amount of the then outstanding
debt securities of that series and a waiver of the payment default that resulted from such acceleration);</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>make the principal of or premium or interest on any debt security payable in currency other than that stated in the debt security;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">make any change to certain provisions of the indenture relating to, among other things, the right of holders
of debt securities (i)&nbsp;to receive payment of the principal, premium and interest on those debt securities, (ii)&nbsp;to institute
suit for the enforcement of any such payment, or (iii)&nbsp;to consent to an amendment or waiver in accordance with the requirements of
the debenture; or</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>waive a redemption payment with respect to any debt security.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Except for certain specified provisions, the holders
of at least a majority in principal amount of the outstanding debt securities of any series may, on behalf of the holders of all debt
securities of that series, waive compliance by us with provisions of the indenture. The holders of a majority in principal amount of the
outstanding debt securities of any series may, on behalf of the holders of all the debt securities of such series, waive any past default
under the indenture with respect to that series and its consequences, except a default in the payment of the principal of or any interest
on any debt security of that series; provided, however, that the holders of a majority in principal amount of the outstanding debt securities
of any series may rescind an acceleration and its consequences, including any related payment default that resulted from the acceleration.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>Defeasance of Debt Securities and Certain Covenants in Certain
Circumstances</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><I>Legal
Defeasance</I></B></FONT>. The indenture provides that, unless otherwise provided by the terms of the applicable series of debt securities,
we may be discharged from any and all obligations in respect of the debt securities of any series (subject to certain exceptions). We
will be so discharged upon the deposit with the trustee, in trust, of money and/or U.S. government obligations or, in the case of debt
securities denominated in a single currency other than U.S. dollars, government obligations of the government that issued or caused to
be issued such currency, that, through the payment of interest and principal in accordance with their terms, will provide money in an
amount sufficient in the opinion of a nationally recognized firm of independent public accountants or investment bank to pay and discharge
each installment of principal, premium and interest on and any mandatory sinking fund payments in respect of the debt securities of that
series on the stated maturity of those payments in accordance with the terms of the indenture and those debt securities.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">This discharge may occur only if, among other things,
we have delivered to the trustee an opinion of counsel stating that we have received from, or there has been published by, the United
States Internal Revenue Service a ruling or, since the date of execution of the indenture, there has been a change in the applicable United
States federal income tax law, in either case to the effect that, and based thereon such opinion shall confirm that, the holders of the
debt securities of that series will not recognize income, gain or loss for United States federal income tax purposes as a result of the
deposit, defeasance and discharge and will be subject to United States federal income tax on the same amounts and in the same manner and
at the same times as would have been the case if the deposit, defeasance and discharge had not occurred.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><I>Defeasance
of Certain Covenants</I></B></FONT>. The indenture provides that, unless otherwise provided by the terms of the applicable series of debt
securities, upon compliance with certain conditions:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>we may omit to comply with the covenant described under the heading &ldquo;Consolidation, Merger and Sale of Assets&rdquo; and certain
other covenants set forth in the indenture, as well as any additional covenants that may be set forth in the applicable prospectus supplement;
and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any omission to comply with those covenants will not constitute a Default or an Event of Default with respect to the debt securities
of that series (&ldquo;covenant defeasance&rdquo;).</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The conditions include:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>depositing with the trustee money and/or U.S. government obligations or, in the case of debt securities denominated in a single currency
other than U.S. Dollars, government obligations of the government that issued or caused to be issued such currency, that, through the
payment of interest and principal in accordance with their terms, will provide money in an amount sufficient in the opinion of a nationally
recognized firm of independent public accountants or investment bank to pay and discharge each installment of principal of, premium and
interest on and any mandatory sinking fund payments in respect of the debt securities of that series on the stated maturity of those payments
in accordance with the terms of the indenture and those debt securities; and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>delivering to the trustee an opinion of counsel to the effect that the holders of the debt securities of that series will not recognize
income, gain or loss for United States federal income tax purposes as a result of the deposit and related covenant defeasance and will
be subject to United States federal income tax on the same amounts and in the same manner and at the same times as would have been the
case if the deposit and related covenant defeasance had not occurred.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><I>Covenant
Defeasance and Events of Default. </I></B></FONT>In the event we exercise our option to effect covenant defeasance with respect to any
series of debt securities and the debt securities of that series are declared due and payable because of the occurrence of any Event of
Default, the amount of money and/or U.S. government obligations or foreign government obligations on deposit with the trustee will be
sufficient to pay amounts due on the debt securities of that series at the time of their stated maturity but may not be sufficient to
pay amounts due on the debt securities of that series at the time of the acceleration resulting from the Event of Default. However, we
shall remain liable for those payments.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>No Personal Liability of Directors, Officers, Employees or Stockholders</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">None of our past, present or future directors,
officers, employees or stockholders, as such, will have any liability for any of our obligations under the debt securities or the indenture
or for any claim based on, or in respect or by reason of, such obligations or their creation. By accepting a debt security, each holder
waives and releases all such liability. This waiver and release is part of the consideration for the issue of the debt securities. However,
this waiver and release may not be effective to waive liabilities under U.S. federal securities laws, and it is the view of the SEC that
such a waiver is against public policy.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>Governing Law</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The indenture and the debt securities will be governed
by, and construed in accordance with, the laws of the State of New York without regard to conflict of law principles that would result
in the application of any law other than the law of the State of New York.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="b_010"></A>Description of Common Stock</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following summary of the rights of our common
stock is not complete and is subject to and qualified in its entirety by reference to our articles of incorporation and bylaws, copies
of which are included as exhibits to our registration statement on Form&nbsp;S-3, of which this prospectus forms a part. See &ldquo;Where
You Can Find More Information.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have 64,500,000 shares of capital stock authorized
under our articles of incorporation, consisting of 62,500,000 shares of common stock and 2,000,000 shares of preferred stock.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">As of July&nbsp;22, 2022, we had 37,951,559 shares
of common stock issued and outstanding. Our authorized but unissued shares of common stock are available for issuance without further
action by our shareholders, unless such action is required by applicable law or the rules&nbsp;of The Nasdaq Stock Market or any other
stock exchange or automated quotation system on which our securities may become listed or traded. If the approval of our shareholders
is not so required, our board of directors may determine not to seek shareholder approval.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Holders of our common stock are entitled to such
dividends as may be declared by our board of directors out of funds legally available for such purpose, subject to any preferential dividend
rights of any then outstanding preferred stock. The shares of common stock are neither redeemable nor convertible. With the exception
of one shareholder who, until June&nbsp;30, 2027, at the latest, and subject to certain conditions, may have the right to participate
in future offerings of our common stock, holders of common stock have no preemptive or subscription rights to purchase any of our securities.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Each holder of our common stock is entitled to
one vote for each such share outstanding in the holder&rsquo;s name. No holder of common stock is entitled to cumulate votes in voting
for directors.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In the event of our liquidation, dissolution or
winding up, the holders of our common stock are entitled to receive pro rata our assets which are legally available for distribution,
after payments of all debts and other liabilities and subject to the prior rights of any holders of preferred stock then outstanding.
All of the outstanding shares of our common stock are fully paid and non-assessable. The shares of common stock offered by this prospectus
will also be fully paid and non-assessable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our common stock is listed on the Nasdaq Capital
Market under the symbol &ldquo;CLIR&rdquo;. On July&nbsp;22, 2022, the last sale price of our common stock was $1.11 per share. The transfer
agent and registrar for our common stock is VStock Transfer, LLC. Its address is 18 Lafayette Place, Woodmere, New York 11598, and its
telephone number is (212) 828-8436.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Anti-Takeover Effects of Certain Provisions of Washington Law and
Our Charter Documents</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following is a summary of certain provisions
of Washington law, our articles of incorporation and our bylaws. This summary does not purport to be complete and is qualified in its
entirety by reference to the corporate law of Washington and our articles of incorporation and bylaws.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Effect
of Washington Anti-Takeover Statute. </I></FONT>We are subject to Chapter 23B.19 of the Revised Code of Washington, an anti-takeover law
(the &ldquo;Anti-Takeover Statute&rdquo;). In general, the Anti-Takeover Statute prohibits a target corporation from entering into a significant
business transaction with an acquiring person for a period of five years following the acquiring person&rsquo;s share acquisition unless</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">the share acquisition is exempt because it was inadvertently made and the acquiring person, as soon as
practicable, divests himself of a sufficient amount of the voting shares of the target corporation so that he is no longer the beneficial
owner, directly or indirectly, of voting shares entitled to cast votes comprising 10% or more of the voting power of the target corporation
and would not have, at any time during the five year period preceding the announcement date of the significant business transaction have
been an acquiring person but for the inadvertent acquisition,</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></FONT></TD><TD>the significant business transaction or the purchase of shares made by the acquiring person is approved prior to the acquiring person&rsquo;s
share acquisition time by a majority of the members of the board of directors of the target corporation; or</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></FONT></TD><TD>at or subsequent to the acquiring person&rsquo;s share acquisition time, the significant business transaction is approved by a majority
of the members of the board of directors of the target corporation and approved at an annual or special meeting of shareholders, and not
by written consent, by the affirmative vote of at least two-thirds of the votes entitled to be cast by the outstanding voting shares of
the target corporation, except shares beneficially owned by or under the voting control of the acquiring person.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The Anti-Takeover Statute generally defines an
 &ldquo;acquiring person&rdquo; as a person or group of persons, other than the target corporation or a subsidiary of the target corporation,
who is the beneficial owner of voting shares entitled to cast votes comprising 10% or more of the voting power of the target corporation;
provided, however, that the term &ldquo;acquiring person&rdquo; does not include a person who (a)&nbsp;beneficially owned voting shares
entitled to cast votes comprising 10% or more of the voting power of the target corporation on March&nbsp;23, 1988; (b)&nbsp;acquired
its voting shares of the target corporation solely by gift, inheritance, or in a transaction in which no consideration is exchanged; (c)&nbsp;equals
or exceeds the 10% threshold as a result of action taken solely by the target corporation, such as redemption of shares, unless that person,
by his own action, acquires additional shares of the target corporation; (d)&nbsp;beneficially owned voting shares entitled to cast votes
comprising 10% or more of the voting power of the target corporation prior to the time the target corporation had a class of voting shares
registered with the SEC pursuant to section 12 or 15 of the Securities Exchange Act; or (e)&nbsp;beneficially owned voting shares entitled
to cast votes comprising 10% or more of the voting power of the target corporation prior to the time the target corporation amended its
articles of incorporation to provide that the corporation shall be subject to the provisions of this chapter.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The Anti-Takeover Statute defines a &ldquo;significant
business transaction&rdquo; as:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 36pt"></TD><TD STYLE="width: 29pt">(a)</TD><TD>A merger, share exchange, or consolidation of a target corporation or a subsidiary of a target corporation with (i)&nbsp;an acquiring
person, or (ii)&nbsp;any other domestic or foreign corporation which is, or after the merger, share exchange, or consolidation would be,
an affiliate or associate of the acquiring person;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 36pt"></TD><TD STYLE="width: 29pt">(b)</TD><TD>A sale, lease, exchange, mortgage, pledge, transfer, or other disposition or encumbrance, whether in one transaction or a series of
transactions, to or with an acquiring person or an affiliate or associate of an acquiring person of assets of a target corporation or
a subsidiary of a target corporation (i)&nbsp;having an aggregate market value equal to 5% or more of the aggregate market value of all
the assets, determined on a consolidated basis, of the target corporation, (ii)&nbsp;having an aggregate market value equal to 5% or more
of the aggregate market value of all the outstanding shares of the target corporation, or (iii)&nbsp;representing 5% or more of the earning
power or net income, determined on a consolidated basis, of the target corporation;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 36pt"></TD><TD STYLE="width: 29pt">(c)</TD><TD>The termination, while the corporation has an acquiring person and as a result of the acquiring person&rsquo;s acquisition of 10%
or more of the shares of the corporation, of 5% or more of the employees of the target corporation or its subsidiaries employed in this
state, whether at one time or over the five-year period following the share acquisition time;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 36pt"></TD><TD STYLE="width: 29pt">(d)</TD><TD>The issuance, transfer, or redemption by a target corporation or a subsidiary of a target corporation, whether in one transaction
or a series of transactions, of shares or of options, warrants, or rights to acquire shares of a target corporation or a subsidiary of
a target corporation to or beneficially owned by an acquiring person or an affiliate or associate of an acquiring person except pursuant
to the exercise of warrants or rights to purchase shares offered, or a dividend, distribution, or redemption paid or made pro rata to,
all shareholders or holders of options, warrants, or rights to acquire shares of the target corporation, and except for involuntary redemptions
permitted by the target corporation&rsquo;s charter or by the law of this state or the state of incorporation;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 36pt"></TD><TD STYLE="width: 29pt">(e)</TD><TD>The liquidation or dissolution of a target corporation proposed by, or pursuant to an agreement, arrangement, or understanding, whether
or not in writing, with an acquiring person or an affiliate or associate of an acquiring person;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 36pt"></TD><TD STYLE="width: 29pt">(f)</TD><TD>A reclassification of securities, including, without limitation, any shares split, shares dividend, or other distribution of shares
in respect of stock, or any reverse shares split, or recapitalization of a target corporation, or a merger or consolidation of a target
corporation with a subsidiary of the target corporation, or any other transaction, whether or not with or into or otherwise involving
an acquiring person, proposed by, or pursuant to an agreement, arrangement, or understanding, whether or not in writing, with an acquiring
person or an affiliate or associate of an acquiring person, that has the effect, directly or indirectly, of increasing the proportionate
share of the outstanding shares of a class or series of voting shares or securities convertible into voting shares of a target corporation
or a subsidiary of the target corporation that is directly or indirectly owned by an acquiring person or an affiliate or associate of
an acquiring person, except as a result of immaterial changes due to fractional share adjustments; or</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 36pt"></TD><TD STYLE="width: 29pt">(g)</TD><TD>A receipt by an acquiring person or an affiliate or associate of an acquiring person of the benefit, directly or indirectly, except
proportionately as a shareholder of a target corporation, of loans, advances, guarantees, pledges, or other financial assistance or tax
credits or other tax advantages provided by or through a target corporation.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Finally, the Anti-Takeover Statute defines a &ldquo;target
corporation&rdquo; as:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 36pt"></TD><TD STYLE="width: 29pt">(a)</TD><TD>Every domestic corporation, if:</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 72pt"></TD><TD STYLE="width: 4pt">(i)</TD><TD>&nbsp;The corporation has a class of voting shares registered with the SEC pursuant to Section&nbsp;12 or 15 of the Securities Exchange
Act; or</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(ii)&nbsp;</FONT><FONT STYLE="font-size: 10pt">The
corporation&rsquo;s articles of incorporation have been amended to provide that such a corporation shall be subject to the provisions
of this chapter, if the corporation did not have a class of voting shares registered with the SEC pursuant to section 12 or 15 of the
Securities Exchange Act on the effective date of that amendment; and</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 36pt"></TD><TD STYLE="width: 29pt">(b)</TD><TD>Every foreign corporation required to register to transact business in the State of Washington pursuant to Chapter 23B.15 and Article&nbsp;5
of Chapter 23.95 of the Revised Code of Washington, if:</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 72pt"></TD><TD STYLE="width: 4pt">(i)</TD><TD>&nbsp;The corporation has a class of voting shares registered with the SEC pursuant to section 12 or 15 of the Securities Exchange Act;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 72pt"></TD><TD STYLE="width: 6pt">(ii)</TD><TD>&nbsp;The corporation&rsquo;s principal executive office is located in the state;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(iii)&nbsp;</FONT><FONT STYLE="font-size: 10pt">The
corporation has: (A)&nbsp;more than 10% of its shareholders of record resident in the state; or (B)&nbsp;more than 10% of its shares
owned of record by state residents; or (C)&nbsp;1,000 or more shareholders of record resident in the state;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(iv)&nbsp;</FONT><FONT STYLE="font-size: 10pt">A
majority of the corporation&rsquo;s employees, together with those of its subsidiaries, are residents of the state or the corporation,
together with its subsidiaries, employs more than one thousand residents of the state; and</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(v)</FONT><FONT STYLE="font-size: 10pt">&nbsp;</FONT>A
majority of the corporation&rsquo;s tangible assets, together with those of its subsidiaries, measured by market value, are located in
the state or the corporation, together with its subsidiaries, has more than fifty million dollars&rsquo; worth of tangible assets located
in the state.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Our
Charter Documents. </I></FONT>Our charter documents include provisions that may have the effect of discouraging, delaying or preventing
a change in control or an unsolicited acquisition proposal that a shareholder might consider favorable, including a proposal that might
result in the payment of a premium over the market price for the shares held by our shareholders. Certain of these provisions are summarized
in the following paragraphs.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Effects
of authorized but unissued common stock and blank check preferred stock. </I></FONT>One of the effects of the existence of authorized
but unissued common stock and undesignated preferred stock may be to enable our board of directors to make more difficult or to discourage
an attempt to obtain control of our Company by means of a merger, tender offer, proxy contest or otherwise, and thereby to protect the
continuity of management. If, in the due exercise of its fiduciary obligations, the board of directors were to determine that a takeover
proposal was not in our best interest, such shares could be issued by the board of directors without shareholder approval in one or more
transactions that might prevent or render more difficult or costly the completion of the takeover transaction by diluting the voting or
other rights of the proposed acquirer or insurgent shareholder group, by putting a substantial voting block in institutional or other
hands that might undertake to support the position of the incumbent board of directors, by effecting an acquisition that might complicate
or preclude the takeover, or otherwise.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In addition, our articles of incorporation grant
our board of directors broad power to establish the rights and preferences of authorized and unissued shares of preferred stock. The issuance
of shares of preferred stock could decrease the amount of earnings and assets available for distribution to holders of shares of common
stock. The issuance also may adversely affect the rights and powers, including voting rights, of those holders and may have the effect
of delaying, deterring or preventing a change in control of our Company.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Cumulative
Voting. </I></FONT>Our articles of incorporation do not provide for cumulative voting in the election of directors and accordingly do
not allow holders of less than a majority of the stock to elect some directors.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Vacancies.
</I></FONT>Our bylaws provide that any vacancy occurring on our board of directors may be filled by the shareholders, by the board of
directors or, if the directors in office constitute less than a quorum, by the affirmative vote of a majority of the remaining directors.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><I>Special
Meeting of Shareholders. </I></FONT>A special meeting of shareholders may only be called by the chairperson of the board of directors,
the president or the board of directors or by holders of at least 20% of all the votes entitled to be cast on any issue proposed to be
considered at the special meeting.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="b_011"></A>Description of Preferred Stock</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our articles of incorporation permit us to issue
up to 2,000,000 shares of preferred stock in one or more series and with rights and preferences that may be fixed or designated by our
board of directors without any further action by our shareholders. We currently have no shares of preferred stock outstanding.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Subject to the limitations prescribed in our articles
of incorporation and under Washington law, our articles of incorporation authorize the board of directors, from time to time by resolution
and without further shareholder action, to provide for the issuance of shares of preferred stock, in one or more series, and to fix the
designation, limitations, voting powers, preferences and relative rights of the shares, including the right to convert the shares into
shares of our common stock, and to fix the qualifications, limitations and restrictions thereof.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="b_012"></A>Description of Warrants</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We may issue warrants for the purchase of any of
our securities, including the securities we are registering. As explained below, each warrant will entitle its holder to purchase the
securities subject to the warrant at an exercise price set forth in, or to be determined as set forth in, the related prospectus supplement.
Warrants may be issued separately or together with securities. The warrants will be issued pursuant to warrant agreements.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The particular terms of each issue of warrants
and the warrant agreement relating to the warrants will be described in the applicable prospectus supplement, including, as applicable:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></FONT></TD><TD>the title of the warrants;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the initial offering price;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the aggregate number of warrants and the aggregate number of securities purchasable upon exercise of the warrants;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>if applicable, the designation and terms of the securities with which the warrants are issued, and the number of warrants issued with
each security;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the date on which the right to exercise the warrants will commence and the date on which the right will expire;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>if applicable, the minimum or maximum number of the warrants that may be exercised at any one time;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>anti-dilution provisions of the warrants, if any;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>redemption or call provisions, if any, applicable to the warrants;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any additional terms of the warrants, including terms, procedures and limitations relating to the exchange and exercise of the warrants;
and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the exercise price.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">Holders of warrants will not
be entitled, solely by virtue of being holders, to vote, to consent, to receive dividends, to receive notice as shareholders with respect
to any meeting of shareholders for the election of directors or any other matter, or to exercise any rights whatsoever as a holder of
the securities purchasable upon exercise of the warrants.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In the case of debt warrants, the prospectus supplement
will contain, where appropriate, the following additional information:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the designation, aggregate principal amount, currency and terms of the debt securities that may be purchased upon exercise of the
debt warrants; and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the designation, terms and amount of debt securities, if any, to be issued together with each of the debt warrants and the date, if
any, after which the debt warrants and debt securities will be separately transferable.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="b_013"></A>Description of Units</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We may, from time to time, issue units comprised
of one or more of the other securities described in this prospectus in any combination. A prospectus supplement will describe the specific
terms of the units offered under that prospectus supplement, and any special considerations applicable to investing in those units. You
must read the applicable prospectus supplement and any applicable unit agreement for a full understanding of the specific terms of any
units. We will incorporate by reference into the registration statement of which this prospectus is a part the form of unit agreement,
including a form of unit certificate, if any, that describes the terms of the series of units we are offering before the issuance of the
related series of units. While the terms we have summarized below will generally apply to any future units that we may offer under this
prospectus, we will describe the particular terms of any series of units that we may offer in more detail in the applicable prospectus
supplement and incorporated documents. The terms of any units offered under a prospectus supplement may differ from the terms described
below.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We may issue units consisting of common stock,
preferred stock, warrants, subscription rights, debt securities or any combination thereof. Each unit will be issued so that the holder
of the unit is also the holder of each security included in the unit. Thus, the holder of a unit will have the rights and obligations
of a holder of each included security. The unit agreement under which a unit is issued may provide that the securities included in the
unit may not be held or transferred separately, at any time, or at any time before a specified date.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We will describe in the applicable prospectus supplement
and any incorporated documents the terms of the series of units, including the following:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the designation and terms of the units and of the securities comprising the units, including whether and under what circumstances
those securities may be held or transferred separately;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any unit agreement under which the units will be issued; and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any provisions for the issuance, payment, settlement, transfer, or exchange of the units or of the securities comprising the units.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The provisions described in this section, as well
as those described under &ldquo;Description of Debt Securities,&rdquo; &ldquo;Description of Common Stock,&rdquo; &ldquo;Description of
Preferred Stock,&rdquo; &ldquo;Description of Warrants&rdquo; and &ldquo;Description of Subscription Rights&rdquo; will apply to each
unit and, as applicable, to each security included in each unit.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We may issue units in such amounts and in such
numerous distinct series as we determine.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Each unit agent will act solely as our agent under
the applicable unit agreement and will not assume any obligation or relationship of agency or trust with any holder of any unit. A unit
agent may act as our agent for more than one series of units. A unit agent will have no duty or responsibility in case of any default
by us under the applicable unit agreement or unit, including any duty or responsibility to initiate any proceedings at law or otherwise,
or to make any demand upon us. Any holder of a unit, without the consent of the related unit agent or the holder of any other unit, may
enforce by appropriate legal action its rights as holder under any security included in the unit.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We, the unit agent, and any of their agents may
treat the registered holder of any unit certificate as an absolute owner of the units evidenced by that certificate for any purposes and
as the person entitled to exercise the rights attaching to the units so requested.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="b_014"></A>Description of Subscription Rights</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We may issue subscription rights to purchase common
stock, preferred stock, debt securities or other securities. These subscription rights may be issued independently or together with any
other security offered hereby and may or may not be transferable by the shareholder receiving the subscription rights in such offering.
In connection with any offering of subscription rights, we may enter into a standby arrangement with one or more underwriters or other
purchasers pursuant to which the underwriters or other purchasers may be required to purchase any securities remaining unsubscribed for
after such offering.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The applicable prospectus supplement will describe
the specific terms of any offering of subscription rights for which this prospectus is being delivered, including the following:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the price, if any, for the subscription rights;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the exercise price payable for each security upon the exercise of the subscription rights;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the number of subscription rights issued to each shareholder;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the number and terms of the securities which may be purchased for each subscription right;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the extent to which the subscription rights are transferable;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any other terms of the subscription rights, including the terms, procedures and limitations relating to the exchange and exercise
of the subscription rights;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the date on which the right to exercise the subscription rights shall commence, and the date on which the subscription rights shall
expire;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the extent to which the subscription rights may include an over-subscription privilege with respect to unsubscribed securities; and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>if applicable, the material terms of any standby underwriting or purchase arrangement entered into by us in connection with the offering
of subscription rights.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The description in the applicable prospectus supplement
of any subscription rights we offer will not necessarily be complete and will be qualified in its entirety by reference to the applicable
subscription rights certificate, which will be filed with the SEC if we offer subscription rights.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="b_015"></A>PLAN OF DISTRIBUTION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We may offer and sell the securities in any one
or more of the following ways:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>to or through underwriters, brokers or dealers;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>directly to one or more other purchasers;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>through a block trade in which the broker or dealer engaged to handle the block trade will attempt to sell the securities as agent,
but may position and resell a portion of the block as principal to facilitate the transaction;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>through agents on a best-efforts basis;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>in &ldquo;at the market&rdquo; offerings, as defined in Rule&nbsp;415 under the Securities Act, at negotiated prices, at prices prevailing
at the time of sale or at prices related to such prevailing market prices, including sales made directly on Nasdaq or sales made through
a market maker other than on an exchange or other similar offerings through sales agents; or</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>otherwise through any other method permitted by applicable law or a combination of any of the above methods of sale.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In addition, we may enter into option, share lending
or other types of transactions that require us to deliver securities to an underwriter, broker or dealer, who will then resell or transfer
the securities under this prospectus. We may also enter into hedging transactions with respect to our securities. For example, we may:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>enter into transactions involving short sales of our securities by underwriters, brokers or dealers;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>sell securities short and deliver the securities to close out short positions;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>enter into option or other types of transactions that require the delivery of securities to an underwriter, broker or dealer, who
will then resell or transfer the securities under this prospectus; or</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>loan or pledge the securities to an underwriter, broker or dealer, who may sell the loaned securities or, in the event of default,
sell the pledged securities.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We may enter into derivative transactions with
third parties, or sell securities not covered by this prospectus to third parties in privately negotiated transactions. If the applicable
prospectus supplement indicates, in connection with those derivatives, the third parties may sell securities covered by this prospectus
and the applicable prospectus supplement, including in short sale transactions. If so, the third party may use securities pledged by or
borrowed from us or others to settle those sales or to close out any related open borrowings of securities, and may use securities received
from us in settlement of those derivatives to close out any related open borrowings of securities. The third party in such sale transactions
will be an underwriter and, if not identified in this prospectus, will be identified in the applicable prospectus supplement (or a post-effective
amendment). In addition, we may otherwise loan or pledge securities to a financial institution or other third party that in turn may sell
the securities short using this prospectus. Such financial institution or other third party may transfer its economic short position to
investors in our securities or in connection with a concurrent offering of other securities.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Each time we sell securities, we will provide a
prospectus supplement that will name any underwriter, dealer or agent involved in the offer and sale of the securities. Any prospectus
supplement will also set forth the terms of the offering, including:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the purchase price of the securities and the proceeds we will receive from the sale of the securities;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any underwriting discounts and other items constituting underwriters&rsquo; compensation;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any public offering or purchase price and any discounts or commissions allowed or re-allowed or paid to dealers;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any commissions allowed or paid to agents;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any other offering expenses;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any securities exchanges on which the securities may be listed;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the method of distribution of the securities;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the terms of any agreement, arrangement or understanding entered into with the underwriters, brokers or dealers; and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>any other information we think is important.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">If underwriters or dealers are used in the sale,
the securities will be acquired by the underwriters or dealers for their own account. We may sell the securities from time to time in
one or more transactions:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>at a fixed price or prices, which may be changed;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>at market prices prevailing at the time of sale;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>at prices related to such prevailing market prices;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>at varying prices determined at the time of sale; or</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>at negotiated prices.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Such sales may be effected:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>in transactions on any national securities exchange or quotation service on which the securities may be listed or quoted at the time
of sale;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>in transactions in the over-the-counter market;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>in block transactions in which the broker or dealer so engaged will attempt to sell the securities as agent but may position and resell
a portion of the block as principal to facilitate the transaction, or in crosses, in which the same broker acts as an agent on both sides
of the trade;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>through the writing of options; or</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>through other types of transactions.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Any securities covered by this prospectus that
qualify for sale pursuant to Rule&nbsp;144 under the Securities Act may be sold under Rule&nbsp;144 rather than pursuant to this prospectus.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The securities may be offered to the public either
through underwriting syndicates represented by one or more managing underwriters or directly by one or more of such firms. Unless otherwise
set forth in the prospectus supplement, the obligations of underwriters or dealers to purchase the securities offered will be subject
to certain conditions precedent and the underwriters or dealers will be obligated to purchase all the offered securities if any are purchased.
Any public offering price and any discount or concession allowed or re-allowed or paid by underwriters or dealers to other dealers may
be changed from time to time.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The securities may be sold directly by us or through
agents as designated from time to time. Any agent involved in the offer or sale of the securities in respect of which this prospectus
is delivered will be named, and any commissions payable to such agent will be set forth in, the prospectus supplement. Unless otherwise
indicated in the prospectus supplement, any such agent will be acting on a best efforts basis for the period of its appointment.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Offers to purchase the securities offered by this
prospectus may be solicited, and sales of the securities may be made by us directly to institutional investors or others, who may be deemed
to be underwriters within the meaning of the Securities Act with respect to any resale of the securities. The terms of any offer made
in this manner will be included in the prospectus supplement relating to the offer.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Some of the underwriters, dealers or agents used
by us in any offering of securities under this prospectus may be customers of, engage in transactions with, and perform services for us
or affiliates of ours in the ordinary course of business. Underwriters, dealers, agents and other persons may be entitled to indemnification
against and contribution toward certain civil liabilities, including liabilities under the Securities Act, and to be reimbursed for certain
expenses.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Subject to any restrictions relating to debt securities
in bearer form, any securities initially sold outside the United States may be resold in the United States through underwriters, dealers
or otherwise.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Any underwriters to which offered securities are
sold by us for public offering and sale may make a market in such securities, but those underwriters will not be obligated to do so and
may discontinue any market making at any time.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The anticipated date of delivery of the securities
offered by this prospectus will be described in the applicable prospectus supplement relating to the offering.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Any broker-dealer participating in the distribution
of the securities may be deemed to be an &ldquo;underwriter&rdquo; within the meaning of the Securities Act with respect to any securities
such entity sells pursuant to this prospectus.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">To comply with the securities laws of some states,
if applicable, the securities may be sold in these jurisdictions only through registered or licensed brokers or dealers. In addition,
in some states the securities may not be sold unless they have been registered or qualified for sale or an exemption from registration
or qualification requirements is available and is complied with.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">There can be no assurance that we will sell all
or any of the securities offered by this prospectus.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="b_016"></A>LEGAL MATTERS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Mitchell Silberberg&nbsp;&amp; Knupp LLP, New York,
New York, will pass upon the validity of the securities offered in this prospectus. Any underwriters will also be advised about the validity
of the securities and other legal matters by their own counsel, which will be named in the prospectus supplement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="b_017"></A>EXPERTS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
consolidated financial statements of ClearSign Technologies Corporation as of December&nbsp;31, 2021 and for the year ended December&nbsp;31,
2021<FONT STYLE="background-color: white">, incorporated in this prospectus by reference to the&nbsp;</FONT>our </FONT><A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000155837022004842/clir-20211231x10k.htm" STYLE="-sec-extract: exhibit">Annual Report on Form&nbsp;10-K for the year ended December&nbsp;31, 2021</A><FONT STYLE="background-color: white">, have been so incorporated in reliance
on the report of BPM LLP, an independent registered public accounting firm, given on the authority of said firm as experts in auditing
and accounting.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The
consolidated financial statements of ClearSign Technologies Corporation as of December&nbsp;31, 2020 and for the year ended December&nbsp;31,
2020<FONT STYLE="background-color: white">, incorporated in this prospectus by reference to the </FONT></FONT><FONT STYLE="background-color: white">Annual
<A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000155837022004842/clir-20211231x10k.htm" STYLE="-sec-extract: exhibit">Report on Form&nbsp;10-K for the year ended December&nbsp;31, 2021</A>, have been so incorporated in reliance on the report of Gumbiner Savett
Inc, an independent public accounting firm, given on the authority of said firm as experts in auditing and accounting.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="b_018"></A>WHERE YOU CAN FIND MORE INFORMATION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have filed with the SEC a registration statement
on Form&nbsp;S-3 under the Securities Act of 1933, as amended (&ldquo;Securities Act&rdquo;), with respect to the securities covered by
this prospectus. This prospectus, which is a part of the registration statement, does not contain all of the information set forth in
the registration statement or the exhibits and schedules filed therewith. For further information with respect to us and the securities
covered by this prospectus, please see the registration statement and the exhibits filed with the registration statement. The SEC maintains
an internet website that contains reports, proxy and information statements and other information regarding registrants that file electronically
with the SEC. The address of the website is www.sec.gov.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We are subject to the information and periodic
reporting requirements of the Exchange Act and, in accordance therewith, we file periodic reports, proxy statements and other information
with the SEC. Such periodic reports, proxy statements and other information are available for inspection and copying at the website of
the SEC referred to above. We maintain a website at www.clearsign.com. You may access our Annual Reports on Form&nbsp;10-K, Quarterly
Reports on Form&nbsp;10-Q, Current Reports on Form&nbsp;8-K and amendments to those reports filed pursuant to Sections 13(a)&nbsp;or 15(d)&nbsp;of
the Exchange Act with the SEC free of charge at our website as soon as reasonably practicable after such material is electronically filed
with, or furnished to, the SEC. Our website and the information contained on that site, or connected to that site, are not incorporated
into and are not a part of this prospectus.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="b_019"></A>INFORMATION INCORPORATED BY REFERENCE</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The SEC and applicable law permits us to &ldquo;incorporate
by reference&rdquo; into this prospectus information that we have or may in the future file with or furnish to the SEC. This means that
we can disclose important information by referring you to those documents. You should read carefully the information incorporated herein
by reference because it is an important part of this prospectus. We hereby incorporate by reference the following documents into this
prospectus:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>our <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000155837022004842/clir-20211231x10k.htm" STYLE="-sec-extract: exhibit">Annual Report on Form&nbsp;10-K for the fiscal year ended December&nbsp;31, 2021, as filed with the SEC on March&nbsp;31, 2022</A></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>our <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000155837022008947/clir-20220331x10q.htm" STYLE="-sec-extract: exhibit">Quarterly Report on Form&nbsp;10-Q for the quarter ended March&nbsp;31, 2022, as filed with the SEC on May&nbsp;16, 2022;</A></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>all information in our <A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837022005773/tmb-20220606xdef14a.htm" STYLE="-sec-extract: exhibit">definitive proxy statement filed with the SEC on April&nbsp;22, 2022</A> to the extent incorporated by reference
in our <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000155837022004842/clir-20211231x10k.htm" STYLE="-sec-extract: exhibit">Annual Report on Form&nbsp;10-K for the year ended December&nbsp;31, 2021</A>; and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 18pt"></TD><TD STYLE="width: 15pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">with the exception of the portions of the following filings that are furnished rather than filed, our
Current Reports on Form&nbsp;8-K filed with the SEC on <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465922043889/tm2212052d1_8k.htm" STYLE="-sec-extract: exhibit">April&nbsp;8, 2022</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465922066648/tm2217097d1_8k.htm" STYLE="-sec-extract: exhibit">May&nbsp;31, 2022</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465922067201/tm2217510d1_8k.htm" STYLE="-sec-extract: exhibit">June&nbsp;1, 2022</A>, and <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465922069031/tm2217668d1_8k.htm" STYLE="-sec-extract: exhibit">June&nbsp;7, 2022</A>.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Additionally, all documents filed by us with the
SEC under Sections 13(a), 13(c), 14 or 15(d)&nbsp;of the Exchange Act (other than any portions of filings that are furnished rather than
filed pursuant to Items 2.02 and 7.01 of a Current Report on Form&nbsp;8-K), after the date of this prospectus and before the termination
or completion of this offering (including all such documents filed with the SEC after the date of the initial registration statement and
prior to the effectiveness of the registration statement) shall be deemed to be incorporated by reference into this prospectus from the
respective dates of filing of such documents. Any information that we subsequently file with the SEC that is incorporated by reference
as described above will automatically update and supersede any previous information that is part of this prospectus.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Upon written or oral request, we will provide to
each person, including any beneficial owner, to whom a prospectus is delivered, without charge, a copy of any or all of the documents
incorporated by reference, other than exhibits to those documents unless the exhibits are specifically incorporated by reference in the
documents. Please send requests to ClearSign Technologies Corporation, 8023 E. 63<SUP>rd</SUP> Pl. Suite&nbsp;101, Tulsa, Oklahoma 74133,
Attn: Brent Hinds, Telephone: (206) 673-4848.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><IMG SRC="tm249031d1_424b5img03.jpg" ALT="A picture containing text, clipart&#10;&#10;Description automatically generated" STYLE="height: 62px; width: 266px"></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Shares of Common Stock
and</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Redeemable Warrants to Purchase up to&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Shares
of Common Stock</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>PROSPECTUS SUPPLEMENT</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 12pt"><B>PUBLIC VENTURES,
LLC</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>, 2024</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
