<SEC-DOCUMENT>0001104659-25-076944.txt : 20250812
<SEC-HEADER>0001104659-25-076944.hdr.sgml : 20250812
<ACCEPTANCE-DATETIME>20250812172917
ACCESSION NUMBER:		0001104659-25-076944
CONFORMED SUBMISSION TYPE:	S-1
PUBLIC DOCUMENT COUNT:		16
FILED AS OF DATE:		20250812
DATE AS OF CHANGE:		20250812

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
		EIN:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		S-1
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-289549
		FILM NUMBER:		251208132

	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>S-1
<SEQUENCE>1
<FILENAME>tm2523037d1_s1.htm
<DESCRIPTION>FORM S-1
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<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>As filed with the Securities and Exchange Commission
on August&nbsp;12, 2025</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: right"><B>Registration No.&nbsp;333-</B></P>

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

<!-- Field: Rule-Page --><DIV STYLE="width: 100%"><DIV STYLE="font-size: 1pt; border-top: Black 2pt solid; border-bottom: Black 1pt solid">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<P STYLE="font: 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>UNITED STATES</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Washington, D.C. 20549</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>FORM&nbsp;S-1</B></P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><I>THE&nbsp;SECURITIES ACT OF 1933</I></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>
    <TD STYLE="width: 100%; border-bottom: black 1pt solid; font-size: 10pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 14pt"><B>CLEARSIGN TECHNOLOGIES CORPORATION</B></FONT></TD></TR>
  <TR>
    <TD STYLE="font-size: 10pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(Exact name of registrant as specified in its charter)</B></FONT></TD></TR>
  </TABLE>
<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>
    <TD STYLE="vertical-align: top; width: 32%; border-bottom: black 1pt solid; font-size: 10pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Delaware</B></FONT></TD>
    <TD STYLE="width: 2%; font-size: 10pt; text-align: justify">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 32%; border-bottom: black 1pt solid; font-size: 10pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>3823</B></FONT></TD>
    <TD STYLE="width: 2%; font-size: 10pt; text-align: justify">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 32%; border-bottom: black 1pt solid; font-size: 10pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>26-2056298</B></FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: center; vertical-align: top">(State or other jurisdiction of<BR> incorporation or organization)</TD>
    <TD STYLE="font-size: 10pt; text-align: center">&nbsp;</TD>
    <TD STYLE="text-align: center; vertical-align: top">(Primary Standard Industrial<BR> Classification Code Number)</TD>
    <TD STYLE="font-size: 10pt; text-align: center">&nbsp;</TD>
    <TD STYLE="text-align: center; vertical-align: top">(I.R.S. Employer<BR> Identification No.)</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"><B>8023 East 63<SUP>rd</SUP>&nbsp;Place, Suite&nbsp;101</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Tulsa, Oklahoma 74133</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(206) 673-4848</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Address, including zip code, and telephone number,</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">including area code, of principal executive offices)</P>

<P STYLE="font: 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>Colin James Deller</B></P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>8023 East 63<SUP>rd</SUP>&nbsp;Place, Suite&nbsp;101</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Tulsa, Oklahoma 74133</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(206) 673-4848</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Address, including zip code, and telephone number,</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">including area code, of agent for service)</P>

<P STYLE="font: 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>Copies to:</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>Blake Baron,&nbsp;Esq.</B></P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>437 Madison Avenue</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>New York, New York 10022</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Phone: (212) 509-3900</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>Approximate date of commencement of proposed
sale to the public</B>: From time to time after the effective date of this registration 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; text-align: justify">If any of the securities being registered on this
Form&nbsp;are to be offered on a delayed or continuous basis pursuant to Rule&nbsp;415&nbsp;under the&nbsp;Securities Act of 1933, check
the following box.&nbsp;<FONT STYLE="font-family: Wingdings">&#120;</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: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif">If
this Form&nbsp;is filed to register additional securities for an offering pursuant to Rule&nbsp;462(b)&nbsp;under the&nbsp;Securities
Act, check the following box and list the&nbsp;Securities Act&nbsp;registration statement number of the earlier effective registration
statement for the same offering.&nbsp;</FONT><FONT STYLE="font-family: Wingdings">&uml;</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: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif">If
this Form&nbsp;is a post-effective amendment filed pursuant to Rule&nbsp;462(c)&nbsp;under the&nbsp;Securities Act, check the following
box and list the&nbsp;Securities Act&nbsp;registration statement number of the earlier effective registration statement for the same offering.&nbsp;</FONT><FONT STYLE="font-family: Wingdings">&uml;</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: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif">If
this Form&nbsp;is a post-effective amendment filed pursuant to Rule&nbsp;462(d)&nbsp;under the&nbsp;Securities Act, check the following
box and list the&nbsp;Securities Act&nbsp;registration number of the earlier effective registration statement for the same offering.&nbsp;</FONT><FONT STYLE="font-family: Wingdings">&uml;</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: justify">Indicate by check mark whether the registrant
is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of &ldquo;large
accelerated filer,&rdquo; &ldquo;accelerated filer&rdquo; and &ldquo;smaller reporting company&rdquo; in Rule&nbsp;12b-2&nbsp;under the&nbsp;Securities
Exchange Act of 1934. (Check one):</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: top">
    <TD STYLE="width: 37%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Large Accelerated Filer</FONT></TD>
    <TD STYLE="width: 17%; text-align: justify"><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD>
    <TD STYLE="width: 29%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Accelerated Filer</FONT></TD>
    <TD STYLE="width: 17%; text-align: right"><FONT STYLE="font-family: Wingdings; font-size: 10pt"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Non-accelerated Filer</FONT></TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><FONT STYLE="font-family: Wingdings">&#120;</FONT></FONT></TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Smaller Reporting Company</FONT></TD>
    <TD STYLE="text-align: right"><FONT STYLE="font-family: Wingdings">&#120;</FONT><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: justify">&nbsp;</TD>
    <TD STYLE="text-align: justify">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Emerging Growth Company</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: right"><FONT STYLE="font-family: Wingdings; font-size: 10pt"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&nbsp;</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-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif">If
an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying
with any new or revised financial accounting standards provided pursuant to Section&nbsp;7(a)(2)(B)&nbsp;of the Securities Act.&nbsp;</FONT><FONT STYLE="font-family: Wingdings">&uml;</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: justify"><B>The Registrant hereby amends this registration
statement on such date or dates as may be necessary to delay its effective date until the Registrant shall file a further amendment that
specifically states that this registration statement shall thereafter become effective in accordance with Section&nbsp;8(a)&nbsp;of the
Securities Act of 1933, as amended, or until the registration statement shall become effective on such date as the Securities and Exchange
Commission, acting pursuant to said Section&nbsp;8(a), may determine.</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"></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>EXPLANATORY NOTE</B></P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">The shares of common stock registered hereunder consists of shares
of common stock issuable upon the exercise of certain redeemable warrants, or the Warrants, to purchase an aggregate of 5,267,222 shares
of common stock, par value $0.0001 per share, at an exercise price of $1.05 per share, which Warrants were previously issued in connection
with our underwritten public offering completed on April&nbsp;23, 2024, and the subsequent exercise of the over-allotment option by the
underwriters in full. The Warrants are exercisable immediately upon issuance, expire five years after the date of issuance and are redeemable
by us, subject to certain market based criteria. The Warrants were issued and sold pursuant to our previous &ldquo;shelf&rdquo; registration
statement on Form&nbsp;S-3 (File No.&nbsp;333-265967), or the Prior Registration Statement, that was declared effective on August&nbsp;12,
2022 and which will expire on August&nbsp;12, 2025 pursuant to Rule&nbsp;415(a)(5)&nbsp;under the Securities Act of 1933, as amended.</P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">We are filing this new Registration Statement on Form&nbsp;S-1 for
the sole purpose of ensuring that an effective Registration Statement covers the exercise of the outstanding Warrants. In accordance with
Securities and Exchange Commission, or the SEC, rules, we may continue to offer and sell securities being registered hereunder during
the grace period afforded by Rule&nbsp;415(a)(5). Pursuant to Rule&nbsp;415(a)(6), the offering of the unsold securities registered under
the Prior Registration Statement will be deemed terminated as of the effective date of this Registration Statement. If we sell any securities
being registered hereunder during the grace period, we will identify in a pre-effective amendment to this Registration Statement the new
amount of securities to be carried forward to this Registration Statement in reliance upon Rule&nbsp;415(a)(6).</P>

<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"></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"><FONT STYLE="color: Red"><B>The information in
this prospectus is not complete and may be changed. We may not sell these securities until the registration statement filed with the
Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities and it is not soliciting an
offer to buy these securities in any state where the offer or sale is not permitted.</B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Red"><B>SUBJECT TO COMPLETION,
DATED AUGUST 12, 2025</B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="color: Red"><B>PRELIMINARY PROSPECTUS</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"><IMG SRC="tm2523037d1_s1img001.jpg" ALT=""></P>

<P STYLE="font: 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>5,267,222 Shares of Common Stock Underlying
the 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-align: justify; text-indent: 0.5in">This prospectus relates to
the issuance of up to 5,267,222 shares of our common stock, par value $0.0001 per share, or the common stock, available for issuance upon
the exercise of 5,267,222 redeemable warrants, or the Warrants, previously issued as part of our public offering of shares of common stock
and accompanying Warrants, at the rate of one Warrants for every one share of common stock, that was completed on April&nbsp;23, 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: justify; text-indent: 0.5in">Each Warrant has an initial
exercise price of $1.05 per share, subject to adjustments, and may only be exercised in cash at the election of the holder at any time
beginning on April&nbsp;23, 2024, the date of issuance, and from time to time thereafter, through and including the fifth anniversary
of the issuance date. The Warrants are redeemable by us from time to time, subject to certain market based criteria. Holders of the Warrants
are not able to exercise their Warrants on a cashless basis. See &ldquo;Description of Securities Being Registered&rdquo; in this prospectus
for additional 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: justify; text-indent: 0.5in">We may receive up to $5.5 million upon the exercise of the Warrants,
if and when the warrant holders elect to exercise such Warrants. We will not receive any proceeds from the sale of the underlying common
stock by the holders of the Warrants. Any amounts received from such exercises will be used for working capital, research and development,
marketing and sales, and general corporate purposes. All costs and expenses incurred in connection with the registration of the offering
made hereby will be paid by us. The registration of these shares of common stock does not necessarily mean that any holder of a Warrant
will exercise such Warrant or that the underlying shares of common stock will be offered or sold by such 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-align: justify; text-indent: 0.5in">Our common stock is listed
on the Nasdaq Capital Market, or Nasdaq, under the symbol &ldquo;CLIR&rdquo;. On August&nbsp;11, 2025, the last reported sale price of
our common stock on Nasdaq was $0.54.</P>

<P STYLE="font: 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">You should read this prospectus,
together with additional information described under the headings &ldquo;Information Incorporated by Reference&rdquo; and &ldquo;Where
You Can Find More Information,&rdquo; carefully before you invest in 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-align: justify"><B>Investing in our common stock involves a high
degree of risk. See &ldquo;Risk Factors&rdquo; beginning on page&nbsp;10 of this prospectus and other filings we make with the Securities
and Exchange Commission from time to time, which are incorporated by reference herein in their entirety, together with other information
in this prospectus and the information incorporated by reference herein.</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>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">The date of this prospectus is &#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;,
2025</P>

<P STYLE="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="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
  <TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD STYLE="width: 90%"><A HREF="#a_001"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">About this Prospectus</FONT></A></TD>
    <TD STYLE="width: 10%; text-align: right"><A HREF="#a_001"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">4</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top; background-color: White">
    <TD><A HREF="#a_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="#a_002"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">4</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD><A HREF="#a_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="#a_003"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top; background-color: White">
    <TD><A HREF="#a_004"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Prospectus Summary</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#a_004"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">6</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD><A HREF="#a_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="#a_005"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">9</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top; background-color: White">
    <TD><A HREF="#a_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="#a_006"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD><A HREF="#a_007"><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_007"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">11</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top; background-color: White">
    <TD><A HREF="#a_008"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><U>Determination of Offering Price</U></FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#a_008">12</A></TD></TR>
  <TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD><A HREF="#a_009"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><U>Dilution</U></FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#a_009">12</A></TD></TR>
  <TR STYLE="vertical-align: top; background-color: White">
    <TD><A HREF="#a_010"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Description of Securities Being Offered</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#a_010"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">13</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD><A HREF="#a_011"><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="#a_011"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">14</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top; background-color: White">
    <TD><A HREF="#a_012"><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_012"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">14</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD><A HREF="#a_013"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Experts</FONT></A></TD>
    <TD STYLE="text-align: right"><A HREF="#a_013"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">15</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top; background-color: White">
    <TD><A HREF="#a_014"><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_014"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">15</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top; background-color: rgb(204,238,255)">
    <TD><A HREF="#a_015"><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_015"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">15</FONT></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>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="a_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-align: justify; text-indent: 0.5in">This prospectus provides you
with a general description of the shares of common stock issuable upon exercise of the Warrants offered by us. In certain circumstances,
we may provide a prospectus supplement that will contain specific information about the terms of a particular offering. We also may provide
a prospectus supplement to add information to, or update or change information contained in, this prospectus. To the extent there is a
conflict between the information contained in this prospectus and any prospectus supplement, you should rely on the information in the
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;&mdash;&thinsp;for example, a document incorporated by reference in this prospectus or any prospectus supplement&thinsp;&mdash;&thinsp;the
statement in the later-dated document modifies or supersedes the earlier 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; text-align: justify; text-indent: 0.5in">You should read both this prospectus and any applicable prospectus
supplement together with the additional information about our company to which we refer you in the sections of this prospectus titled
 &ldquo;Where You Can Find More Information&rdquo; and &ldquo;Information Incorporated by Reference.&rdquo; You should rely only on the
information contained in or incorporated by reference into this prospectus and any prospectus supplement. We have not authorized any dealer,
salesperson or other person to provide you with different information. You should not assume that the information in this prospectus or
any prospectus supplement is accurate as of any date other than the date on the front of those documents or that any document incorporated
by reference is accurate as of any date other than its filing date. You should not consider this prospectus to be an offer or solicitation
relating to the shares of common stock issuable upon exercise of the Warrants in any jurisdiction in which such an offer or solicitation
relating to such shares of common stock is not authorized. Furthermore, you should not consider this prospectus to be an offer or solicitation
relating to the shares of common stock issuable upon exercise of the Warrants if the person making the offer or solicitation is not qualified
to do so, or if it is unlawful for you to receive such an 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; text-align: justify; text-indent: 0.5in">This prospectus is an offer
to sell only the securities offered hereby and only under circumstances and in jurisdictions where it is lawful to do so. This prospectus
is not an offer to sell securities, and it is not soliciting an offer to buy securities, in any jurisdiction where the offer or sale is
not permitted. This prospectus contains summaries of certain provisions contained in some of the documents described herein, but reference
is made to the actual documents for complete information. All of the summaries are qualified in their entirety by the actual documents.
Copies of some of the documents referred to herein have been filed, will be filed or will be incorporated by reference as exhibits to
the registration statement of which this prospectus is a part, and you may obtain copies of those documents as described below under the
section titled &ldquo;Where You Can Find Additional 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; background-color: white">Unless otherwise stated
or the context otherwise requires, the terms &ldquo;we,&rdquo; &ldquo;us,&rdquo; &ldquo;our,&rdquo; &ldquo;ClearSign&rdquo; and 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="a_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-align: justify; 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 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"></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>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, including
the documents that we incorporate by reference, may contain forward-looking statements within the meaning of Section&nbsp;27A of the Securities
Act, and Section&nbsp;21E of the Securities Exchange Act of 1934, as amended (the &ldquo;Exchange Act&rdquo;).</P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;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;</P>

<P STYLE="font: 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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;our
ability to successfully develop and implement our technologies and achieve profitability;</P>

<P STYLE="font: 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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;our
limited operating history;</P>

<P STYLE="font: 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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;our
ability to maintain the listing of our common stock on Nasdaq;</P>

<P STYLE="font: 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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;changes
in government regulations that could substantially reduce, or even eliminate, the need for our technology;</P>

<P STYLE="font: 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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;emerging
competition and rapidly advancing technology in our industry that may outpace our technology;</P>

<P STYLE="font: 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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;customer
demand for the products and services we develop;</P>

<P STYLE="font: 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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;the
impact of competitive or alternative products, technologies, and pricing;</P>

<P STYLE="font: 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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;our
ability to manufacture any products we design;</P>

<P STYLE="font: 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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;general
economic conditions and events and the impact they may have on us and our potential customers;</P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;the
impact of global supply-chain constraints and the threat of, or implementation of, tariffs on imported or exported goods and materials
may adversely affect our commercialization efforts and business operations;</P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;our
revenue has been highly concentrated among a small number or customers, and our results of operations could be harmed if we lose a key
revenue source and fail to replace it;</P>

<P STYLE="font: 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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;the
impact of a cybersecurity incident or other technology disruption;</P>

<P STYLE="font: 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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;our
ability to protect our intellectual property;</P>

<P STYLE="font: 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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;
our ability to obtain adequate financing in the 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; text-align: justify; text-indent: 0.5in">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;our
ability to retain and hire personnel with the experience and talent to develop our products and business;</P>

<P STYLE="font: 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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;our
success at managing the risks involved in the foregoing items; and</P>

<P STYLE="font: 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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;other
factors discussed in 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: justify; 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>

<DIV STYLE="border: Black 1pt solid; padding-right: 0.25in; padding-left: 0.25in">

<P STYLE="font: 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>PROSPECTUS 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-align: justify; text-indent: 0.5in"><I>This summary highlights
information contained elsewhere or incorporated by reference in this 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 carefully, including the &ldquo;Risk Factors&rdquo; section contained in this 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; text-align: justify; background-color: white"><B>Overview</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; background-color: white">We
design and develop technologies for the purpose of decarbonization and improving key performance characteristics of industrial and commercial
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, midstream gas processing and transportation, and down-stream refining), institutional, commercial
and industrial boiler, chemical, and petrochemical industries. Our ClearSign Core<SUP>TM</SUP>&nbsp;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.</P>

<P STYLE="font: 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; background-color: white">Our
combustion technology has been successfully deployed in commercial projects such as down-stream refining and upstream oil production.
These applications include our process burner, flaring and boiler burner technologies. Both our process burner and boiler burner technology
can operate in high-intensity industrial burner applications at sites that are required to meet low air pollutant emissions.</P>

<P STYLE="font: 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; background-color: white">We
believe that combustion equipment utilizing ClearSign Core<SUP>TM</SUP>&nbsp;technology is more effective and cost-efficient than current
industry-standard air pollution control technologies and can reduce nitrogen oxide (&ldquo;NOx&rdquo;) 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 industry-standard air pollution control technologies include selective catalytic reduction devices (&ldquo;SCRs&rdquo;), 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 petroleum refining and petrochemical process heaters, large-scale
once through steam generators (&ldquo;OTSGs&rdquo;), enclosed flares, institutional commercial and industrial boilers and other similar
equipment. We believe that our ClearSign Core<SUP>TM</SUP>&nbsp;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-align: justify; text-indent: 0.5in; background-color: white">Based
on the operating data we have obtained from our installed products, burners utilizing ClearSign Core<SUP>TM</SUP>&nbsp;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 a significantly attractive pay-back period for an investment in ClearSign Core<SUP>TM</SUP>&nbsp;technology-based
burners. In addition, because the flame volumes in heaters utilizing ClearSign Core<SUP>TM</SUP>&nbsp;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<SUP>TM</SUP>&nbsp;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<SUP>TM</SUP>&nbsp;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>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in; background-color: white">We
are also designing and commercializing a range of sensing products called the ClearSign Eye for two potential markets. The primary addressable
market is similar to that of our ClearSign Core<SUP>TM</SUP>&nbsp;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-align: justify; 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.
We are collaborating with Narion Corporation to further develop our technology for this industry, which allows us to incur minimal costs
while pursuing this market opportunity. 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-align: justify; 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>

</DIV>

<P STYLE="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: justify; background-color: white"><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-align: justify; text-indent: 0.5in; background-color: white">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&trade; 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. 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-align: justify; text-indent: 0.5in; background-color: white">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 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<SUP>TM</SUP>&nbsp;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-align: justify; background-color: white"><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-align: justify; background-color: white"><B><I>Notice of Delisting
or Failure to Satisfy a Continued Listing Rule&nbsp;or Standard</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-align: justify; text-indent: 0.5in; background-color: white">On
April&nbsp;1, 2025, we received a letter (the &ldquo;Notice&rdquo;) from Nasdaq&rsquo;s Listing Qualifications Staff (the &ldquo;Staff&rdquo;)
indicating that, based upon the closing bid price of our common stock for the 30 consecutive business days beginning on February&nbsp;18,
2025, and ending on March&nbsp;31, 2025, we no longer meet the requirement to maintain a minimum bid price of $1 per share, as set forth
in Nasdaq Listing Rule&nbsp;5550(a)(2).</P>

<P STYLE="font: 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; background-color: white">In
accordance with Nasdaq Listing Rule&nbsp;5810(c)(3)(A), we have been provided a period of 180 calendar days, or until September&nbsp;29,
2025, in which to regain compliance. In order to regain compliance with the minimum bid price requirement, the closing bid price of our
common stock must be at least $1 per share for a minimum of ten consecutive business days during this 180 day period. In the event that
we do not regain compliance within this 180 day period, we may be eligible to seek an additional compliance period of 180 calendar days
if it meets the continued listing requirement for market value of publicly held shares and all other initial listing standards for Nasdaq,
with the exception of the bid price requirement, and provides written notice to Nasdaq of its intent to cure the deficiency during this
second compliance period, by effecting a reverse stock split, if necessary. However, if it appears to the Staff that we will not be able
to cure the deficiency, or if we are not otherwise eligible, Nasdaq will provide notice to us that our common stock will be subject to
delisting.</P>

<P STYLE="font: 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; background-color: white">The
Notice does not result in the immediate delisting of our common stock from Nasdaq. We intend to monitor the closing bid price of our common
stock and consider its available options in the event that the closing bid price of our common stock remains below $1 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-align: justify; background-color: white"><B><I>ATM Program Termination</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-align: justify; text-indent: 0.5in; background-color: white">Effective
as of July&nbsp;12, 2025, we terminated our At-the-Market Sales Agreement, dated as of December&nbsp;23, 2020 (the &ldquo;Virtu Sales
Agreement&rdquo;), with Virtu Americas LLC. At the time of termination, we had sold 1,594,285 shares of our common stock under the Virtu
Sales Agreement for aggregate gross proceeds of approximately $6,122,650.</P>

<P STYLE="font: 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; background-color: white"><B><I>Wainwright ATM
Program</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-align: justify; text-indent: 0.25in; background-color: white">On
July&nbsp;17, 2025, we entered into&nbsp;<FONT STYLE="background-color: white">an At The Market Offering Agreement (the &ldquo;ATM Agreement&rdquo;)
with H.C. Wainwright&nbsp;&amp; Co., LLC (&ldquo;Wainwright&rdquo;). In accordance with the terms of the ATM Agreement, we may offer and
sell from time to time through Wainwright, acting as sales agent, shares of our common stock having an aggregate offering price of up
to $10,390,000 (the &ldquo;Placement Shares&rdquo;). The Placement Shares will be issued pursuant to the Company&rsquo;s shelf registration
statement on Form&nbsp;S-3&nbsp;</FONT>filed with the SEC on July&nbsp;17, 2025 (the &ldquo;Registration Statement&rdquo;) and the prospectus
relating to the offer and sale of the Placement Shares that forms a part of the Registration Statement, which was declared effective by
the SEC on July&nbsp;28, 2025.</P>

<P STYLE="font: 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; background-color: white"><B><I>Second Notice of
Delisting or Failure to Satisfy a Continued Listing Rule&nbsp;or Standard</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-align: justify; text-indent: 0.5in; background-color: white">On
August&nbsp;8, 2025, we received a notice (the &ldquo;Second Notice&rdquo;) from Nasdaq&rsquo;s Listing Qualifications Department stating
that we are not in compliance with the board of directors independence requirement set forth in Nasdaq Listing Rule&nbsp;5605(b)(1)&nbsp;and
the audit committee composition requirement set forth in Nasdaq Listing Rule&nbsp;5605(c)(2)(A)&nbsp;(collectively, the &ldquo;Nasdaq
Composition Requirements&rdquo;) due to the resignations of Catharine M. de Lacy and Judith S. Schrecker from the Company&rsquo;s board
of directors (the &ldquo;board of directors&rdquo;) on August&nbsp;4, 2026.</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">&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: justify; text-indent: 0.5in; background-color: white">Specifically,
when the Second Notice was issued, the board of directors did not have a majority of directors that would be considered &ldquo;independent
directors,&rdquo; as that term is defined in Nasdaq Listing Rule&nbsp;5605(a)(2), and the Audit and Risk Committee of the board of directors
(the &ldquo;Audit Committee&rdquo;) consisted of only two independent directors, rather than the minimum three independent directors as
required by Nasdaq Listing Rule&nbsp;5605(c)(2)(A).</P>

<P STYLE="font: 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; background-color: white">We
intend to regain compliance with the Nasdaq Composition Requirements by appointing a new director to the board of directors and Audit
Committee who meets the independence requirements under Nasdaq rules&nbsp;and Rule&nbsp;10A-3(b)(1)&nbsp;under the Exchange Act. Consistent
with Nasdaq Listing Rules&nbsp;5605(b)(1)(A)&nbsp;and 5605(c)(4), Nasdaq has provided us a cure period in order to regain compliance with
the Nasdaq Composition Requirements (i)&nbsp;until the earlier of our next annual meeting of stockholders or one year from the resignation
of Mss. de Lacy and Schrecker, or August&nbsp;4, 2026, or (ii)&nbsp;if our next annual meeting of stockholders is held before February&nbsp;2,
2026, then no later than February&nbsp;2, 2026.</P>

<P STYLE="font: 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; background-color: white">The
Second Notice has no immediate effect on the listing of our common stock on Nasdaq.</P>

<P STYLE="font: 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; background-color: white"><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-align: justify; text-indent: 0.5in; background-color: white">We
were incorporated in the State of Washington on January&nbsp;23, 2008. Effective June&nbsp;14, 2023, we changed our domicile from the
State of Washington to the State of Delaware by means of a plan of conversion. The address of our corporate headquarters is 8023 East
63rd Place, Suite&nbsp;101, Tulsa, Oklahoma 74133 and our telephone number is (918) 236-6461. Our website can be accessed at www.clearsign.com.
We currently operate in the United States.</P>

<P STYLE="font: 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; background-color: white">Information
contained in, or accessible through, our website does not constitute part of this prospectus or registration statement and inclusions
of our website address in this prospectus or registration statement are inactive textual references only. You should not rely on any such
information in making your decision 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; text-align: justify; text-indent: 0.5in; background-color: white">We
are a &ldquo;smaller reporting company&rdquo; as defined under U.S. federal securities laws and are subject to reduced public company
reporting requirements.</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">&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>

<DIV STYLE="border: Black 1pt solid; padding-right: 0.25in; padding-left: 0.25in">

<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><A NAME="a_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="padding-left: 5.4pt; width: 41%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Shares of common stock offered</B></FONT></TD>
    <TD STYLE="width: 59%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">We are offering 5,267,222 shares of common stock, which are issuable upon the exercise of our outstanding Warrants to purchase shares of our common stock.</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="text-align: justify">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-left: 5.4pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Shares of common stock to be outstanding immediately after this offering</B></FONT></TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">57,693,504 shares of common stock, assuming the exercise of the Warrants in full.</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="text-align: justify">&nbsp;</TD></TR>
  <TR>
    <TD STYLE="padding-left: 5.4pt; vertical-align: top"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Use of proceeds</B></FONT></TD>
    <TD STYLE="vertical-align: bottom; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">We
may receive up to $5.5 million upon the exercise of the Warrants, if and when the Warrant holders elect to exercise such Warrants. We
will not receive any proceeds from the sale of the underlying common stock. Please see the section titled &ldquo;Plan of Distribution&rdquo;
on page&nbsp;14 for more information regarding the distribution of the Warrants. Please refer to &ldquo;Description of Securities Being
Registered,&rdquo; beginning on page&nbsp;13 for the description of the Warrants. We intend to use the net proceeds from any exercise
of the Warrants for working capital, research and development, marketing and sales, and general corporate purposes. Please see the section
entitled see &ldquo;Use of Proceeds&rdquo; on page&nbsp;11 of this prospectus for a more detailed discussion.</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="text-align: justify">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-left: 5.4pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Market for our securities</B></FONT></TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our common stock is currently traded on Nasdaq under the symbol &ldquo;CLIR.&rdquo; </FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="text-align: justify">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-left: 5.4pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Risk factors</B></FONT></TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">An investment in our securities involves a high degree of risk. Please see the section entitled &ldquo;Risk Factors&rdquo; beginning on page&nbsp;10 of this prospectus and the risk factors incorporated by reference into this 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">The number of shares of common stock to be outstanding
after this offering is based on 52,426,282 shares outstanding as of August&nbsp;12, 2025, and excludes:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;&#8239;&#8239;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;Approximately 1,234,000 shares
of common stock issuable upon the vesting of outstanding restricted stock units;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;Approximately 2,397,000 shares
issuable upon the exercise of outstanding stock options with a weighted-average exercise price of $2.03 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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;Approximately 491,000 shares
issuable upon the exercise of outstanding stock options granted outside of our Equity Incentive Plans (as defined below) at a weighted
average exercise price of $1.53 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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;Approximately 1,535,000 shares
reserved for future issuances under the ClearSign Technologies Corporation 2021 Equity Incentive Plan (the &ldquo;2021 Plan&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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;Approximately 278,000 shares
reserved for future issuances under the ClearSign Technologies Corporation 2013 Consultant Stock Plan (the &ldquo;Consultant Plan,&rdquo;
together with the ClearSign Technologies Corporation 2011 Equity Incentive Plan and the 2021 Plan, the &ldquo;Equity Incentive Plans&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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;425,109 shares of our common
stock issuable upon exercise of underwriter warrants issued to Public Ventures, LLC (&ldquo;Public Ventures&rdquo;) in connection with
an underwritten public offering at an exercise price of $1.1375 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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;15,147,606 shares of common
stock issuable upon exercise of certain redeemable warrants outstanding at an exercise of $1.05 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">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;2,795,395 shares of common
stock issuable upon exercise of certain pre-funded warrants outstanding at an exercise of $0.0001 per share; and</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#9679;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;432,432 shares of common stock
issuable upon exercise of placement agent warrants issued to Public Ventures as placement agent at an exercise of $1.1375 per share.</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">&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_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-align: justify; text-indent: 0.5in"><I>Investing in our securities
involves a high degree of risk. You should consider carefully the risks and uncertainties described below, and incorporated by reference
herein, together with all of the other information in, or incorporated by reference in, this prospectus, including our financial statements
and related notes incorporated by reference herein, before making an investment decision If any of these risks actually occurs, our business,
financial condition, results of operations or cash flow could suffer materially. In such an event, the trading price of our shares of
common stock could decline, and you might lose all or part of your investment.</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: justify"><B>Risks Related to this Offering and to Our 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-align: justify"><B><I>If the Warrant holders exercise their Warrants
in full and sell significant amounts of common stock, or the perception exists that these sales could occur, such events could cause the
common stock price to decline.</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-align: justify; text-indent: 0.5in">The shares of common stock
issuable upon exercise of the Warrants being registered for resale in this prospectus will be freely tradable without restriction or further
registration under the&nbsp;Securities Act upon exercise of the Warrants. As a result, a substantial number of shares of common stock
may be sold in the public market to the extent the Warrants are exercised. If there are significantly more shares of common stock offered
for sale than buyers are willing to purchase, then the market price of the common stock may decline to a market price at which buyers
are willing to purchase the offered common stock and sellers remain willing to sell 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-align: justify"><B><I>Our ability to utilize our common stock
to finance future capital needs, or for other purposes, is limited by the number of authorized shares of common stock currently available
for issuance.</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; background-color: white">As of the date of this
prospectus, we had authority to issue a total of 87,500,000 shares of common stock, of which 52,426,282 shares of common stock have been
issued and approximately 30,000,000 shares of common stock are reserved for issuance in connection with certain securities issued under
our Equity Incentive Plans and other outstanding securities, including stock options and warrants.</P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">We have historically financed
our operations primarily through issuances of equity securities. With the limited shares of common stock presently available for issuance,
our ability to secure additional financing through the sale of common stock, to the extent needed, is limited. Absent an increase in the
shares of common stock authorized to be issued under our certificate of incorporation, we will be limited to other financing structures
in the event additional financing is required. Such alternative structures may be less favorable or unavailable in which case we may be
forced to forego opportunities or required to downsize operations due to lack of funding.</P>

<P STYLE="font: 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><I>We will have broad discretion as to the
proceeds that we receive from the exercise by any holder of the Warrants, and we may not use the proceeds effectively.</I></B></P>

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

<P STYLE="margin: 0pt 0; font: 10pt Times New Roman, Times, Serif">We will not receive any of the proceeds from the sale of the shares
of common stock underlying the Warrants. However, we may receive up to approximately $5.5 million in aggregate gross proceeds from the
exercise of the Warrants, based on the per share exercise price of the Warrants, and to the extent that we receive such proceeds, we
intend to use the net proceeds from the exercise of the Warrants for working capital, research and development, marketing and sales,
and general corporate purposes. We have considerable discretion in the application of such proceeds. You will not have the opportunity,
as part of your investment decision, to assess whether such proceeds are being used in a manner agreeable to you. You must rely on our
judgment regarding the application of the net proceeds from the exercise of the Warrants, which may be used for corporate purposes that
do not improve our profitability or increase the price of our shares of common stock. Such proceeds may also be placed in investments
that do not produce income or that lose value. The failure to use such funds by us effectively could have a material adverse effect on
our business, financial condition, operating results and cash flow.</P>

<P STYLE="font: 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><I>You may experience future dilution as a
result of issuance of the shares of common stock underlying the Warrants, future equity offerings by us and other issuances of our common
stock or other securities. In addition, the issuance of the shares of common stock upon exercise of the Warrants, to the extent the Warrants
are exercised, and future equity offerings and other issuances of our common stock or other securities may adversely affect our common
stock price.</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-align: justify; text-indent: 0.5in">You may experience future
dilution as a result of issuance of the shares of common stock underlying the Warrants, future equity offerings by us and other issuances
of our common stock or other securities. 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 not be the same as the price per share
as prior issuances of common stock. 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 previously paid by investors, 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 prices per share for previous issuances
of common stock or securities convertible into common stock paid by certain investors. In addition, the exercise price of the Warrants
may be equal to or greater than the price per share previously paid by certain investors. You will incur dilution upon exercise of any
outstanding stock options, warrants or upon the issuance of shares of common stock under our equity incentive programs. In addition, the
issuance of the shares of common stock underlying the Warrants 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 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>In making your investment decision, you should rely only on statements
made in this prospectus 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-align: justify; text-indent: 0.5in">You should carefully evaluate
all of the information in this prospectus. We have received in the past, 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 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; text-align: justify"><B><I>The price of our common stock may be volatile,
and the market price of our common stock may decrease.</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-align: justify; text-indent: 0.5in">The price of our common stock
may vary from time to time. The factors that may cause the market price of our common stock to fluctuate include, but are not limited
to:</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>
    <TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 97%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">progress, or lack of progress, in developing and commercializing our technology;</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
  <TR>
    <TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 97%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">our ability to recruit and retain qualified personnel;</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
  <TR>
    <TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 97%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">changes in the perception of investors and securities analysts regarding the risks to our business or the condition of our business;</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
  <TR>
    <TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 97%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">changes in our relationships with key customers;</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-align: justify; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
  <TR>
    <TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 97%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">changes in the market valuation or earnings of our competitors or companies viewed as similar to us;</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-align: justify; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
  <TR>
    <TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 97%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">changes in key personnel;</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-align: justify; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
  <TR>
    <TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 97%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">changes in our capital structure, such as future issuances of securities or the incurrence of debt;</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-align: justify; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
  <TR>
    <TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 97%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">the granting or exercise of employee stock options or other equity awards; and</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.75in; text-align: justify; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
  <TR>
    <TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 97%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">general market and economic conditions.</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">In addition, the equity markets
have experienced significant price and volume fluctuations that have affected the market prices for the securities of small companies
such as ours for a number of reasons, including reasons that may be unrelated to the business or operating performance. These broad market
fluctuations may result in a material decline in the market price of our common stock and you may not be able to sell your shares of common
stock at prices you deem acceptable. In the past, following periods of volatility in the equity markets, securities class action lawsuits
have been instituted against public companies. Such litigation, if instituted against us, could result in substantial cost and in the
diversion of management attention.</P>

<P STYLE="font: 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>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-align: justify; text-indent: 0.5in">The gross proceeds that we
receive from the exercise of the Warrants will depend upon the number of Warrants exercised. If the Warrants are exercised in full, we
will receive gross proceeds of approximately $5.5 million. There can be no assurance that any Warrant holder will exercise Warrants, especially
since, as of the date of this prospectus, none of the Warrants are in-the-money.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">We intend to use the net proceeds
from the exercise of the Warrants for working capital, research and development, marketing and sales, and general corporate purposes.
We have broad discretion in determining how the proceeds from the exercise of the Warrants, if any, will be used, and our discretion is
not limited by the aforementioned possible uses. Our board of directors believes the flexibility in application of the net proceeds is
prudent. See the section entitled &ldquo;Risk Factors &ndash; Risks Related to this Offering and to our Common Stock &ndash; We will have
broad discretion as to the proceeds that we receive from the exercise by any holder of the Warrants, and we may not use the proceeds effectively.&rdquo;&nbsp;This
expected use of the net proceeds from any exercise of the Warrants represents our intentions based upon our current plans and business
conditions, and our management will retain broad discretion as to the ultimate allocation of the proceeds. We may temporarily invest funds
that we do not immediately need for these purposes in investment securities or use them to make payments on our borrowings.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">We will bear all other costs,
fees and expenses incurred in effecting the registration of the offer and sale of the shares issuable upon exercise of the Warrants covered
by this prospectus and any accompanying prospectus supplement, including, without limitation, all registration and filing fees, Nasdaq
listing fees and fees and expenses of our counsel and our accountants.</P>

<P STYLE="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"><FONT STYLE="text-transform: uppercase"><B><A NAME="a_008"></A>DETERMINATION
OF OFFERING PRICE</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: justify; text-indent: 0.5in">The terms and the public offering
prices of the securities offered in the underwritten public offering in which we issued the Warrants 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.</P>

<P STYLE="font: 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="text-transform: uppercase"><B><A NAME="a_009"></A>Dilution</B></FONT></P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">If the Warrants are exercised in full, your ownership
interest will be diluted to the extent of the difference between the Warrants&rsquo; exercise price per share and our pro forma net tangible
book value per share immediately after this offering.</P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our historical net tangible book value as of March&nbsp;31,
2025 was approximately $11.2 million, or $0.21 per share of common stock. We calculate net tangible book value per share by dividing our
total tangible assets, less total liabilities, by the number of shares of our common stock outstanding as of March&nbsp;31, 2025.</P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">After giving effect to the exercise of all outstanding Warrants at
an exercise price of $1.05 per share, and after deducting estimated aggregate offering expenses payable by us, our pro forma net tangible
book value as of March&nbsp;31, 2025 is approximately $16.7 million. This represents an immediate increase in net tangible book value
of $0.08 per share of common stock to existing stockholders and an immediate dilution in net tangible book value of $0.76 per share of
common stock to the holders of the outstanding 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-align: justify; text-indent: 0.5in">The following table illustrates
this per share dilution:</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; background-color: #CCEEFF">
    <TD STYLE="width: 74%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exercise price per share</FONT></TD>
    <TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 10%; text-align: right">&nbsp;</TD>
    <TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="width: 10%; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">1.05</FONT></TD>
    <TD STYLE="width: 1%">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: white">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Net tangible book value per share as of March&nbsp;31, 2025</FONT></TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">0.21</FONT></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: #CCEEFF">
    <TD STYLE="padding-left: 0.125in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Increase in net tangible book value per share attributable to this offering</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">0.08</FONT></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid">&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid; text-align: right">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: white">
    <TD STYLE="padding-left: 0.125in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Pro forma net tangible book value per share as of March&nbsp;31, 2025, after giving effect to this offering</FONT></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="border-bottom: black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">0.29</FONT></TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: #CCEEFF">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Dilution per share to new investors purchasing shares in this offering</FONT></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="border-bottom: black 2.25pt double"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">$</FONT></TD>
    <TD STYLE="border-bottom: black 2.25pt double; text-align: right"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">0.76</FONT></TD>
    <TD>&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; background-color: white">The foregoing discussion
and table illustrates the dilution in net tangible book value per share to the holders of the Warrants as of March&nbsp;31, 2025. The
foregoing table illustrates this calculation on a per share 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 above discussion and table are based on 52,422,532
shares of our common stock issued and outstanding as of March&nbsp;31, 2025, except as described, and excludes, as of such date:</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%">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 2%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="width: 98%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Approximately 987,000&nbsp;shares of common stock issuable upon the vesting of outstanding restricted stock units;</FONT></TD></TR>
  </TABLE>
<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%">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 2%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="width: 98%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Approximately 2,397,000 shares issuable upon the exercise of outstanding stock options with a weighted-average exercise price of $2.03 per share;</FONT></TD></TR>
  </TABLE>
<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%">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 2%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="width: 98%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Approximately 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;</FONT></TD></TR>
  </TABLE>
<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%">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 2%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="width: 98%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Approximately 1,782,000 shares reserved for future issuances under the 2021 Plan;</FONT></TD></TR>
  </TABLE>
<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%">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 2%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="width: 98%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Approximately 281,000 shares reserved for future issuances under the Consultant Plan;</FONT></TD></TR>
  </TABLE>
<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%">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 2%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="width: 98%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">425,109 shares of our common stock issuable upon exercise of underwriter warrants issued to Public Ventures&nbsp;in connection with an underwritten public offering at an exercise price of $1.1375 per share;</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">15,147,606 shares of common stock issuable upon exercise of certain redeemable warrants outstanding at an exercise of $1.05 per share;</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white">2,795,395&nbsp;</FONT><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">shares of common stock issuable upon exercise of certain pre-funded warrants outstanding at an exercise of $0.0001 per share; and</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD><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">432,432 shares of common stock issuable upon exercise of placement agent warrants issued to Public Ventures as placement agent at an exercise of $1.1375 per share.</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The discussion and table above assume no exercise
of any other outstanding warrants. To the extent that other outstanding warrants are exercised, you may experience further dilution. In
addition, we may choose to raise additional capital due to market conditions or strategic considerations even if we believe we have sufficient
funds for our current or future operating plans. To the extent that additional capital is raised through the sale of equity or convertible
debt securities, the issuance of these securities could result in further dilution to our stockholders.</P>

<P STYLE="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_010"></A>DESCRIPTION OF SECURITIES BEING REGISTERED</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>General</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">We are registering the issuance
of 5,267,222 shares of common stock upon the exercise of the Warrants.</P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following summary of certain material terms
of our securities is not intended to be a complete summary of the rights and preferences of such securities. You should refer to our bylaws,
as amended from time to time, and our certificate of incorporation, as amended from time to time. The summary below is also qualified
by reference to the provisions of the Delaware General Corporation Law (the &ldquo;DGCL&rdquo;), as applicable.</P>

<P STYLE="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>Authorized and Outstanding 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 certificate of incorporation authorized capital
stock consists of 89,500,000 shares, $0.0001 par value per share, consisting of: (i)&nbsp;87,500,000 shares of common stock; and (ii)&nbsp;2,000,000&nbsp;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 August&nbsp;12, 2025, we have (i)&nbsp;52,426,282
shares of common stock issued and outstanding, and (ii)&nbsp;0 shares of preferred stock issued and 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"><B>Common Stock</B></P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Dividend Rights</I>. The DGCL permits a corporation
to declare and pay dividends out of &ldquo;surplus&rdquo; or, if there is no &ldquo;surplus,&rdquo; out of its net profits for the fiscal
year in which the dividend is declared and/or the preceding fiscal year. &ldquo;Surplus&rdquo; is defined as the excess of the net assets
of the corporation over the amount determined to be the capital of the corporation by the board of directors. The capital of the corporation
is typically calculated to be (and cannot be less than) the aggregate par value of all issued shares of capital stock. Net assets equals
the fair value of the total assets minus total liabilities. The DGCL also provides that dividends may not be paid out of net profits if,
after the payment of the dividend, capital is less than the capital represented by the outstanding stock of all classes having a preference
upon the distribution of assets. Delaware common law also imposes a solvency requirement in connection with the payment of dividends.</P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Subject to applicable law and the rights and preferences
of any holders of any outstanding series of preferred stock, the holders of common stock will be entitled to the payment of dividends
on the common stock when, as and if declared by the board of directors in accordance with applicable law.</P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Voting Rights</I>. Holders of common stock will
be entitled to one vote for each share held as of the record date for determining stockholders entitled to vote on such matters, except
as otherwise required by law.</P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Right to Receive Liquidation Distributions</I>.
Subject to the rights and preferences of any holders of any shares of any outstanding series of preferred stock, in the event of any liquidation,
dissolution or winding up of the Company, the funds and assets of the Company that may be legally distributed to the stockholders will
be distributed among the holders of the then outstanding common stock pro rata in accordance with the number of shares of common stock
held by each such 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"><I>Other Matters</I>. All outstanding shares of
the common stock will be fully paid and nonassessable. The common stock will not be entitled to preemptive rights and will not be subject
to redemption or sinking fund provisions.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white"><B>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; background-color: white">Our certificate of incorporation
provides that shares of preferred stock may be issued from time to time in one or more series. The board of directors will be authorized
to fix the voting rights, if any, designations, powers, preferences, the relative, participating, optional or other special rights and
any qualifications, limitations and restrictions thereof, applicable to the shares of each series. The board of directors will be able
to, without stockholder approval, issue preferred stock with voting and other rights that could have anti-takeover&nbsp;effects. The ability
of the board of directors to issue preferred stock without stockholder approval could have the effect of delaying, deferring or preventing
a change of control of us or the removal of existing management. We have no preferred stock outstanding at the date hereof. Although we
do not currently intend to issue any shares of preferred stock, we cannot assure you that we will not do so in the 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; background-color: white"><B>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; background-color: white">On April&nbsp;23, 2024,
we completed an underwritten public offering, whereby we sold 4,620,760 shares of common stock and accompanying Warrants to purchase up
to 4,620,760 shares of common stock, which included a 45-day option for Public Ventures, as underwriter of the public offering, to purchase
up to an additional 693,114 shares of common stock and Warrants to purchase up to 693,114 shares of common stock, or up to 693,114 shares
of common stock only, at a price of $0.92 per set of one share of common stock and one Warrant. Subsequently, on May&nbsp;15, 2024, Public
Ventures exercised its over-allotment option in full to purchase an additional 693,114 shares of common stock and Warrants to purchase
up to 693,114 shares of common stock. As of the date hereof, 46,652 Warrants have been exercised and the shares of common stock underlying
such exercised Warrants have been issued.</P>

<P STYLE="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="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Exercise Price</I>. The initial exercise price
of the Warrants is $1.05&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="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Exercisability</I>. 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. In lieu of fractional shares upon exercise of a 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="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Transferability</I>. 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 were issued in book-entry form and were 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="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Redemption.</I>&nbsp;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 price of the common stock reported, 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 $2.275&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="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Exchange Listing</I>. The Warrants are not listed
on Nasdaq or any other national securities exchange or any other nationally recognized trading system, and we do not intend to do so.</P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Rights as a Stockholder</I>. 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"><B>Transfer Agent and Registrar</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: 0.25in">The transfer agent and registrar for our common
stock is VStock Transfer, 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"><B>Trading Symbols and Market</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: 0.25in">Our common stock is listed on Nasdaq under the
symbol &ldquo;CLIR.&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><A NAME="a_011"></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-align: justify; text-indent: 0.5in">The common stock referenced on the cover page&nbsp;of this prospectus
will be offered solely by us and will be issued and sold upon the exercise of the Warrants described herein. The shares of common stock
issuable upon exercise of the Warrants were previously registered pursuant to our previous &ldquo;shelf&rdquo; registration statement
on Form&nbsp;S-3 (File No.&nbsp;333-265967).</P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The shares of common stock issuable upon the exercise
of the Warrants will not be offered through underwriters, or brokers or dealers. We will not pay any compensation in connection with the
offering of the shares of common stock 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-align: center"><B><A NAME="a_012"></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-align: justify; text-indent: 0.5in">The validity of the shares
of common stock offered hereby will be passed upon for us by Mitchell Silberberg&nbsp;&amp; Knupp 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"></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_013"></A>EXPERTS</B></P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The consolidated financial statements for ClearSign
Technologies Corporation as of December&nbsp;31, 2024 and 2023, and for each of the two years in the period ended December&nbsp;31, 2024,
incorporated in this prospectus by reference to the&nbsp;<A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000155837025004155/clir-20241231x10k.htm" STYLE="-sec-extract: exhibit">Annual Report on Form&nbsp;10-K for the year ended December&nbsp;31, 2024</A> have
been so incorporated in reliance on the report of BPM CPA LLP, an independent registered public accounting firm, given on the authority
of said firm as experts in auditing and accounting.</P>

<P STYLE="font: 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_014"></A>INFORMATION INCORPORATED BY REFERENCE</B></P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The SEC allows us to &ldquo;incorporate by reference&rdquo;
the information we file with them, which means that we can disclose important information by referring you to those documents. The information
incorporated by reference is considered to be part of this prospectus, and information that we file later with the SEC will automatically
update and supersede the information that is either incorporated by reference, or contained in, this prospectus and will be considered
a part of this prospectus from the date those documents are filed. We incorporate by reference the documents listed below:</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%; background-color: white; border-collapse: collapse">
  <TR>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></FONT></TD>
    <TD STYLE="vertical-align: top; width: 93%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our Annual
    Report on&nbsp;Form&nbsp;10-K&nbsp;for the fiscal year ended December&nbsp;31, 2024, filed with the SEC on&nbsp;<FONT><A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000155837025004155/clir-20241231x10k.htm" STYLE="-sec-extract: exhibit">March&nbsp;31, 2025</A></FONT>, as amended by our Annual Report on&nbsp;Form&nbsp;10-K/A&nbsp;for the fiscal year ended December&nbsp;31, 2024, filed
    with the SEC on&nbsp;<A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465925053646/tm2516383d1_10ka.htm" STYLE="-sec-extract: exhibit">May&nbsp;28, 2025</A>;</FONT></TD></TR>
  <TR>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD></TR>
  <TR>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font-family: Symbol; font-size: 10pt">&middot;</FONT></TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our Quarterly Report on
    Form&nbsp;10-Q&nbsp;for the fiscal quarter ended March&nbsp;31, 2025, filed with the SEC on&nbsp;<A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000155837025007875/clir-20250331x10q.htm" STYLE="-sec-extract: exhibit">May&nbsp;15, 2025</A>;</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white; border-collapse: collapse">
  <TR>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%"><FONT STYLE="font-family: Symbol; font-size: 10pt">&middot;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 93%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Our Current
    Reports on Form&nbsp;8-K&nbsp;filed with the SEC on&nbsp;<A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465925031996/tm2511519d1_8k.htm" STYLE="-sec-extract: exhibit">April&nbsp;4, 2025</A>,&nbsp;<A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465925052251/tm2516021d1_8k.htm" STYLE="-sec-extract: exhibit">May&nbsp;23, 2025</A>,&nbsp;<A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465925052998/tm2516138d1_8k.htm" STYLE="-sec-extract: exhibit">May&nbsp;27, 2025</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465925067452/tm2520697d1_8k.htm" STYLE="-sec-extract: exhibit">July&nbsp;11, 2025</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465925068797/tm2521146d1_8k.htm" STYLE="-sec-extract: exhibit">July&nbsp;18, 2025</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465925071166/tm2521893d1_8k.htm" STYLE="-sec-extract: exhibit">July&nbsp;28, 2025</A>, and <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000110465925075708/tm2522983d1_8k.htm" STYLE="-sec-extract: exhibit">August&nbsp;8, 2025</A>; and</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white; border-collapse: collapse">
  <TR>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 2%"><FONT STYLE="font-family: Symbol; font-size: 10pt">&middot;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 93%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">the description
    of our common stock contained in <A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837025004155/clir-20241231xex4d1.htm" STYLE="-sec-extract: exhibit">Exhibit&nbsp;4.1</A> to our Annual Report on Form&nbsp;10-K for the fiscal year ended December&nbsp;31,
    2024,&nbsp;<A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837025004155/clir-20241231xex4d1.htm" STYLE="-sec-extract: exhibit">filed with the SEC on March&nbsp;31, 2025</A><FONT></FONT>, and any amendment or report filed for the
    purpose of updating such description.</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In addition, all documents filed by us with the
SEC pursuant to Sections 13(a), 13(c), 14 or 15(d)&nbsp;of the&nbsp;Exchange Act&nbsp;subsequent to the date of filing the registration
statement that includes this prospectus and prior to the filing of a post-effective amendment to the registration statement containing
this prospectus, which indicates that all securities offered have been sold or which deregisters all of such securities then remaining
unsold, shall be deemed to be incorporated by reference in this prospectus and to be a part hereof from the respective dates of filing
of such documents. However, we are not incorporating by reference, in each case, any information or documents that are deemed to be furnished
and not filed in accordance with SEC rules, including any information furnished pursuant to Items 2.02 or 7.01 of Form&nbsp;8-K or related
exhibits furnished pursuant to Item 9.01 of Form&nbsp;8-K.</P>

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

<P STYLE="text-align: justify; 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:</P>

<P STYLE="font: 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">ClearSign Technologies Corporation</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">8023 E. 63<SUP>rd</SUP>&nbsp;Place, Suite&nbsp;101</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Tulsa, OK 74133<BR>
<FONT STYLE="background-color: white">(918) 236-6461</FONT></P>

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

<P STYLE="font: 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_015"></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-align: justify; text-indent: 0.5in; background-color: white">We
have filed with the SEC, under the Securities Act, a registration statement on Form&nbsp;S-1 relating to the securities offered hereby.
This prospectus does not contain all of the information set forth in the registration statement and the exhibits and schedules thereto.
For further information with respect to our company and the securities we are offering by this prospectus you should refer to the registration
statement, including the exhibits and schedules thereto. The SEC also maintains an Internet site that contains reports, proxy and information
statements and other information regarding registrants that file electronically with the SEC. The SEC&rsquo;s website address is http://www.sec.gov.</P>

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

<P STYLE="text-align: justify; 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"><IMG SRC="tm2523037d1_s1img001.jpg" ALT="">&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>5,267,222 Shares of Common Stock Underlying
the 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-align: center"><B>PRELIMINARY 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"><B>, 2025</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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    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 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>PART&nbsp;II</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>INFORMATION NOT REQUIRED IN PROSPECTUS</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: 10%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Item 13.</B></FONT></TD>
    <TD STYLE="width: 90%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Other Expenses of Issuance and Distribution.</B></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-align: justify; text-indent: 0.5in">The following table sets forth
the costs and expenses, other than placement agent fees, paid or payable by ClearSign Technologies Corporation (the &ldquo;Registrant&rdquo;)
in connection with the sale and distribution of the securities being registered. All amounts are estimated except the SEC registration
fee.</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: 10pt Times New Roman, Times, Serif; border-bottom: Black 1pt solid">Item</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; border-bottom: Black 1pt solid">Amount</TD><TD STYLE="padding-bottom: 1pt; font: 10pt Times New Roman, Times, Serif">&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">SEC registration fee</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">-</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="width: 87%; font: 10pt Times New Roman, Times, Serif; text-align: left">Legal fees and expenses</TD><TD STYLE="width: 1%; font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="width: 1%; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; font: 10pt Times New Roman, Times, Serif; text-align: right">15,000</TD><TD STYLE="width: 1%; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; padding-bottom: 1pt">Accounting fees and expenses</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">8,500</TD><TD STYLE="padding-bottom: 1pt; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt">Total</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">23,500</TD><TD STYLE="padding-bottom: 1pt; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD></TR>
  </TABLE>

<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: 10%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Item 14.</B></FONT></TD>
    <TD STYLE="width: 90%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Indemnification of Directors and Officers.</B></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-align: justify; text-indent: 0.5in">As permitted by Section&nbsp;102
of the Delaware General Corporation Law (the &ldquo;DGCL&rdquo;), the Registrant&rsquo;s Certificate of Incorporation (as amended from
time to time, the &ldquo;Certificate of Incorporation&rdquo;) and Bylaws (as amended from time to time, the &ldquo;Bylaws&rdquo;) contain
provisions that limit or eliminate the personal liability of the Registrant&rsquo;s officers and directors for a breach of their fiduciary
duty as a director and/or officer, as applicable. For example, the fiduciary duty of care generally requires that, when acting on behalf
of the corporation, directors exercise an informed business judgment based on all material information reasonably available to them. Consequently,
a director will not be personally liable to the Registrant or its stockholders for monetary damages for breach of fiduciary duty as a
director, except to the extent such exemption from liability or limitation thereof is not permitted under the DGCL.</P>

<P STYLE="font: 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">These limitations of liability
do not affect the availability of equitable remedies such as injunctive relief or rescission. The Certificate of Incorporation will also
authorize the Registrant to indemnify officers, directors, and other agents of the Registrant to the fullest extent permitted under Delaware
law.</P>

<P STYLE="font: 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">As permitted by Section&nbsp;145
of the DGCL, the Bylaws will provide that:</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: 1%">&nbsp;</TD>
    <TD STYLE="width: 2%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="width: 97%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">the Registrant may indemnify directors, officers, and employees of the Registrant to the fullest extent permitted by the DGCL, subject to limited exceptions; and</FONT></TD></TR>
  </TABLE>
<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: 1%">&nbsp;</TD>
    <TD STYLE="width: 2%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">&#9679;</FONT></TD>
    <TD STYLE="width: 97%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">the rights provided in the Bylaws are not exclusive.</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">The Certificate of Incorporation
and Bylaws provide for the indemnification provisions described above. The Registrant has entered into, and intends to continue to enter
into, separate indemnification agreements with the Registrant&rsquo;s directors and officers that may be broader than the specific indemnification
provisions contained in the DGCL. These indemnification agreements generally requires the Registrant, among other things, to indemnify
the Registrant&rsquo;s officers and directors against certain liabilities that may arise by reason of their status or service as directors
or officers, other than liabilities arising from willful misconduct. These indemnification agreements also generally requires the Registrant
to advance any expenses incurred by the directors or officers as a result of any proceeding against them as to which they could be indemnified.
These indemnification provisions and the indemnification agreements may be sufficiently broad to permit indemnification of the Registrant&rsquo;s
officers and directors for liabilities, including reimbursement of expenses incurred, arising under the Securities Act.</P>

<P STYLE="font: 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">The Registrant has purchased
and currently maintains insurance on behalf of each and every person who is or was a director or officer of the Registrant against any
loss arising from any claim asserted against him or her and incurred by him or her in any such capacity, subject to certain exclusions.</P>

<P STYLE="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 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: 10%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Item 15.</B></FONT></TD>
    <TD STYLE="width: 90%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Recent Sales of Unregistered Securities.</B></FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">On April&nbsp;23, 2024, in
connection with a public offering, the Registrant issued warrants to Public Ventures, LLC, as underwriter of the public offering (&ldquo;Public
Ventures&rdquo;), to purchase up to 369,660 shares of common stock at an exercise price of $1.1375 per share as a consideration for the
services provided (the &ldquo;Underwriter Warrants&rdquo;), which became exercisable as of October&nbsp;16, 2024. Subsequently, on May&nbsp;15,
2024, in connection with Public Ventures&rsquo; full exercise of its over-allotment option, we issued to Public Ventures additional Underwriter
Warrants to purchase up to 55,449 shares of common stock. The Underwriter Warrants may be exercised on a cashless basis based on a formula
set forth in the Underwriter Warrants. The Underwriter Warrants were offered pursuant to the exemption provided in Section&nbsp;4(a)(2)&nbsp;under
the Securities Act and Rule&nbsp;506(b)&nbsp;promulgated thereunder.</P>

<P STYLE="font: 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">On April&nbsp;23, 2024, in
connection with a private placement that was completed concurrently with the public offering described above, the Registrant issued to
one accredited investor (i)&nbsp;2,249,763 shares of common stock (the &ldquo;Private Shares&rdquo;), (ii)&nbsp;pre-funded warrants (the
 &ldquo;Pre-Funded Warrants&rdquo;) to purchase up to 3,155,642 shares of common stock, and (iii)&nbsp;redeemable warrants (the &ldquo;Private
Warrants,&rdquo; together with the Private Shares and Pre-Funded Warrants, the &ldquo;Private Securities&rdquo;) to purchase up to 8,108,106
shares of common stock, resulting in gross proceeds to the Registrant of approximately $5,000,000. The Private Securities were offered
pursuant to the exemption provided in Section&nbsp;4(a)(2)&nbsp;under the Securities Act and Rule&nbsp;506(b)&nbsp;promulgated thereunder.</P>

<P STYLE="font: 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">On April&nbsp;23, 2024, the
Registrant issued Public Ventures, as exclusive placement agent in connection with the private placement described above, warrants to
purchase up to 432,432 shares of common stock (the &ldquo;Placement Agent Warrants&rdquo;) as consideration for their services. The Placement
Agent Warrants became exercisable on October&nbsp;16, 2024, have an exercise price of $1.1375 per share and may be exercised on a cashless
basis based on a formula set forth in the Placement Agent Warrants. The Placement Agent Warrants were offered pursuant to the exemption
provided in Section&nbsp;4(a)(2)&nbsp;under the Securities Act and Rule&nbsp;506(b)&nbsp;promulgated thereunder.</P>

<P STYLE="font: 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">On June&nbsp;24, 2024, in
connection with the exercise of the participation right granted to clirSPV LLC (&ldquo;clirSPV&rdquo;) pursuant to that certain Stock
Purchase Agreement, dated July&nbsp;12, 2018, between the Registrant and clirSPV (as modified from time to time, the &ldquo;Participation
Right&rdquo;), the Registrant issued to clirSPV (i)&nbsp;3,350,000 shares of common stock, (ii)&nbsp;Pre-Funded Warrants to purchase up
to 1,343,000 shares of common stock, and (iii)&nbsp;Private Warrants to purchase up to 7,039,500 shares of common stock, resulting in
gross proceeds to the Registrant of approximately $4,300,000. The securities issued to clirSPV pursuant to its Participation Right exercise
were offered pursuant to the exemption provided in Section&nbsp;4(a)(2)&nbsp;under the Securities Act and Rule&nbsp;506(b)&nbsp;promulgated
thereunder.</P>

<P STYLE="font: 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">From August&nbsp;12, 2022
to August&nbsp;12, 2025, the Registrant issued 70,000 shares of common stock pursuant to its 2013 Consultant Stock Plan to Firm IR Group,
LLC, with a per share value ranging from $0.66 to $1.93, in exchange for their services. These shares were issued in reliance upon the
exemption from registration provided by Section&nbsp;4(a)(2)&nbsp;of the Securities Act, for a transaction by an issuer not involving
a public offering.</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: 10%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Item 16.</B></FONT></TD>
    <TD STYLE="width: 90%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Exhibits and Financial Statement Schedules.</B></FONT></TD></TR>
  </TABLE>
<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>
    <TD STYLE="width: 7%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 7%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(a)</FONT></TD>
    <TD STYLE="vertical-align: top; width: 86%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Exhibit&nbsp;Index</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 10%; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Exhibit<BR>
No.</B></FONT></TD>
    <TD STYLE="width: 3%; text-align: justify">&nbsp;</TD>
    <TD STYLE="width: 87%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Description&nbsp;of&nbsp;Document</B></FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465925068740/tm2520917d1_ex1-2.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">1.1</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465925068740/tm2520917d1_ex1-2.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">At The Market Offering Agreement by and between ClaerSign Technologies Corporation and H.C. Wainwright&nbsp;&amp; Co., LLC, dated July&nbsp;17, 2025 (incorporated by reference to Exhibit&nbsp;1.2 to the Company&rsquo;s Form&nbsp;S-3 filed with the Securities and Exchange Commission on July&nbsp;17, 2025).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465923071426/tm2318661d1_ex2-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">2.1</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465923071426/tm2318661d1_ex2-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Plan of Conversion, dated June&nbsp;14, 2023 (incorporated by reference to Exhibit&nbsp;2.1 to the Company&rsquo;s Form&nbsp;8-K filed with the Securities and Exchange Commission on June&nbsp;15, 2023).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465923071426/tm2318661d1_ex3-3.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">3.1</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465923071426/tm2318661d1_ex3-3.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Certificate of Incorporation of ClearSign Technologies Corporation, a Delaware corporation (incorporated by reference to Exhibit&nbsp;3.3 to the Company&rsquo;s Form&nbsp;8-K filed with the Securities and Exchange Commission on June&nbsp;15, 2023).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465924075194/tm2418248d1_ex3-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">3.2</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465924075194/tm2418248d1_ex3-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Certificate of Amendment, as filed with the Secretary of the State of Delaware on June&nbsp;26, 2024 (incorporated by reference to Exhibit&nbsp;3.1 of the Company&rsquo;s Form&nbsp;8-K filed with the Securities and Exchange Commission on June&nbsp;26, 2024).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465923071426/tm2318661d1_ex3-4.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">3.3</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465923071426/tm2318661d1_ex3-4.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Bylaws of ClearSign Technologies Corporation, a Delaware corporation (incorporated by reference to Exhibit&nbsp;3.4 to the Company&rsquo;s Form&nbsp;8-K filed with the Securities and Exchange Commission on June&nbsp;15, 2023).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465923071426/tm2318661d1_ex3-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">3.4</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465923071426/tm2318661d1_ex3-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Certificate of Conversion, as filed with the Secretary of State of the State of Delaware on June&nbsp;14, 2023 (incorporated by reference to Exhibit&nbsp;3.1 to the Company&rsquo;s Form&nbsp;8-K filed with the Securities and Exchange Commission on June&nbsp;15, 2023).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465923071426/tm2318661d1_ex3-2.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">3.5</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465923071426/tm2318661d1_ex3-2.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Articles of Conversion, as filed with the Secretary of State of the State of Washington on June&nbsp;14, 2023 (incorporated by reference to Exhibit&nbsp;3.2 to the Company&rsquo;s Form&nbsp;8-K filed with the Securities and Exchange Commission on June&nbsp;15, 2023).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465924049160/tm2412212d1_ex4-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">4.1</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465924049160/tm2412212d1_ex4-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Form&nbsp;of Common Warrant (incorporated by reference to Exhibit&nbsp;4.1 of the Company&rsquo;s Form&nbsp;8-K filed with the Securities and Exchange Commission on April&nbsp;19, 2024).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465924049160/tm2412212d1_ex4-2.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">4.2</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465924049160/tm2412212d1_ex4-2.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Form&nbsp;of Underwriter&rsquo;s Warrant (incorporated by reference to Exhibit&nbsp;4.2 of the Company&rsquo;s Form&nbsp;8-K filed with the Securities and Exchange Commission on April&nbsp;19, 2024).</FONT></A></TD></TR>
</TABLE>

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

<P STYLE="margin: 0"></P>

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<P STYLE="margin: 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: top">
    <TD STYLE="text-align: center; width: 10%"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465924049160/tm2412212d1_ex4-3.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">4.3</FONT></A></TD>
    <TD STYLE="width: 3%">&nbsp;</TD>
    <TD STYLE="text-align: justify; width: 87%"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465924049160/tm2412212d1_ex4-3.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Form&nbsp;of Private Warrant (incorporated by reference to Exhibit&nbsp;4.3 of the Company&rsquo;s Form&nbsp;8-K filed with the Securities and Exchange Commission on April&nbsp;19, 2024).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465924050306/tm2412465d1_ex4-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">4.4</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465924050306/tm2412465d1_ex4-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Form&nbsp;of Pre-Funded Warrant (incorporated by reference to Exhibit&nbsp;4.1 of the Company&rsquo;s Form&nbsp;8-K filed with the Securities and Exchange Commission on April&nbsp;23, 2024).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465924049160/tm2412212d1_ex4-4.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">4.5</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465924049160/tm2412212d1_ex4-4.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Form&nbsp;of Placement Agent Warrant (incorporated by reference to Exhibit&nbsp;4.4 of the Company&rsquo;s Form&nbsp;8-K filed with the Securities and Exchange Commission on April&nbsp;19, 2024).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="tm2523037d1_ex5-1.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5.1*</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="tm2523037d1_ex5-1.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Opinion of Mitchell Silberberg&nbsp;&amp; Knupp LLP.</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000114420415012243/v400802_ex10-6.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.1+</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000114420415012243/v400802_ex10-6.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Form&nbsp;of Confidentiality and Proprietary Rights Agreement (incorporated by reference to Exhibit&nbsp;10.6 to the Company&rsquo;s Form&nbsp;10-K filed with the Securities and Exchange Commission on February&nbsp;26, 2015).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837023014714/clir-20230630xex10d1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.2</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837023014714/clir-20230630xex10d1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Form&nbsp;of Director and Officer Indemnification Agreement (incorporated by reference to Exhibit&nbsp;10.1 to the Company&rsquo;s Form&nbsp;10-Q filed with the Securities and Exchange Commission on August&nbsp;14, 2023)</FONT><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">.</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000114420413026485/v342447_ex10-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.3</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000114420413026485/v342447_ex10-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">ClearSign Combustion Corporation 2013 Consultant Stock Plan (incorporated by reference to Exhibit&nbsp;10.1 to the Company&rsquo;s Form&nbsp;10-Q filed with the Securities and Exchange Commission on May&nbsp;6, 2013)</FONT><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">.</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000114420419003769/tv511973_ex10-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.4+</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000114420419003769/tv511973_ex10-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Employment Agreement dated January&nbsp;28, 2019 between the registrant and Colin James Deller (incorporated by reference to Exhibit&nbsp;10.1 to the Company&rsquo;s Form&nbsp;8-K filed with the Securities and Exchange Commission on January&nbsp;30, 2019).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465921062561/tm2114678d1_def14a.htm#Kalai_015" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.5+</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465921062561/tm2114678d1_def14a.htm#Kalai_015" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">ClearSign Technologies Corporation 2021 Equity Incentive Plan (incorporated by reference to Appendix A from the Company&rsquo;s Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission on May&nbsp;7, 2021).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837022004842/clir-20211231xex10d13.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.6</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837022004842/clir-20211231xex10d13.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021 Equity Incentive Plan Form&nbsp;of Stock Option Award Agreement (incorporated by reference to Exhibit&nbsp;10.13 to the Company&rsquo;s Form&nbsp;10-K filed with the Securities and Exchange Commission on March&nbsp;31, 2022).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837022004842/clir-20211231xex10d13.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.7</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837022004842/clir-20211231xex10d13.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021 Equity Incentive Plan Form&nbsp;of Restricted Stock Unit Award Agreement (incorporated by reference to Exhibit&nbsp;10.14 to the Company&rsquo;s Form&nbsp;10-K filed with the Securities and Exchange Commission on March&nbsp;31, 2022).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837022004842/clir-20211231xex10d15.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.8</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837022004842/clir-20211231xex10d15.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">2021 Equity Incentive Plan Form&nbsp;of Restricted Stock Award Agreement (incorporated by reference to Exhibit&nbsp;10.15 to the Company&rsquo;s Form&nbsp;10-K filed with the Securities and Exchange Commission on March&nbsp;31, 2022).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000141057821000115/clir-20210930xex10d1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.9+</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000141057821000115/clir-20210930xex10d1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Offer Letter dated October&nbsp;18, 2021 by and between the Company and Brent Hinds (incorporated by reference to Exhibit&nbsp;10.1 to the Company&rsquo;s Form&nbsp;10-Q filed with the Securities and Exchange Commission on November&nbsp;12, 2021).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837022004842/clir-20211231xex10d18.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.10</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837022004842/clir-20211231xex10d18.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Lease Agreement, entered into as of June&nbsp;20, 2016, between Paradigm Realty Advisors, L.L.C. and ClearSign Technologies Corporation (incorporated by reference to Exhibit&nbsp;10.18 to the Company&rsquo;s Form&nbsp;10-K filed with the Securities and Exchange Commission on March&nbsp;31, 2022).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837022004842/clir-20211231xex10d19.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.11</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837022004842/clir-20211231xex10d19.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">First Amendment to Lease, entered into as of July&nbsp;29, 2019, between Tulsa Portfolio Oklahoma Realty LP and ClearSign Technologies Corporation (incorporated by reference to Exhibit&nbsp;10.19 to the Company&rsquo;s Form&nbsp;10-K filed with the Securities and Exchange Commission on March&nbsp;31, 2022).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837022004842/clir-20211231xex10d20.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.12</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837022004842/clir-20211231xex10d20.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Second Amendment to Lease, entered into as of January&nbsp;14, 2020, between Tulsa Portfolio Oklahoma Realty LP and ClearSign Technologies Corporation (incorporated by reference to Exhibit&nbsp;10.20 to the Company&rsquo;s Form&nbsp;10-K filed with the Securities and Exchange Commission on March&nbsp;31, 2022).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837022013628/clir-20220630xex10d1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.13+</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837022013628/clir-20220630xex10d1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Amendment to Employment Agreement between the Company and Colin James Deller (incorporated by reference to Exhibit&nbsp;10.1 to the Company&rsquo;s Form&nbsp;10-Q filed with the Securities and Exchange Commission on August&nbsp;15, 2022).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837023014714/clir-20230630xex10d2.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.14+</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000155837023014714/clir-20230630xex10d2.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Amendment to Offer Letter between the Company and Brent Hinds, dated August&nbsp;8, 2023 (incorporated by reference to the Company&rsquo;s Form&nbsp;10-Q filed with the Securities and Exchange Commission on August&nbsp;14, 2023).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465924049160/tm2412212d1_ex10-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.15</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465924049160/tm2412212d1_ex10-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Form&nbsp;of Warrant Agency Agreement, by and between ClearSign Technologies Corporation and VStock Transfer, LLC (incorporated by reference to Exhibit&nbsp;10.1 of the Company&rsquo;s Form&nbsp;8-K filed with the Securities and Exchange Commission on April&nbsp;19, 2024).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465924063437/tm2414836d1_ex10-25.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.16</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465924063437/tm2414836d1_ex10-25.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Amendment to Warrant Agency Agreement, dated as of May&nbsp;15, 2024, by and between ClearSign Technologies Corporation and VStock Transfer, LLC (incorporated by reference to Exhibit&nbsp;10.25 of the Company&rsquo;s Form&nbsp;S-1 filed with the Securities and Exchange Commission on May&nbsp;20, 2024).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465924086124/tm2420801d1_ex10-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.17+</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465924086124/tm2420801d1_ex10-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">G. Todd Silva&rsquo;s Offer Letter, effective as of August&nbsp;1, 2024 (incorporated by reference to Exhibit&nbsp;10.1 of the Company&rsquo;s Form&nbsp;8-K filed with the Securities and Exchange Commission on August&nbsp;6, 2024).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465925052998/tm2516138d1_ex10-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.18</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465925052998/tm2516138d1_ex10-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cooperation Agreement, dated May&nbsp;22, 2025, by and between ClearSign Technologies Corporation and Richard D. Clarkson (incorporated by reference to Exhibit&nbsp;10.1 of the Company&rsquo;s Form&nbsp;8-K filed with the Securities and Exchange Commission on May&nbsp;27, 2025).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465925052998/tm2516138d1_ex10-2.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.19</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465925052998/tm2516138d1_ex10-2.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cooperation Agreement, dated May&nbsp;22, 2025, by and between ClearSign Technologies Corporation and Anthony DiGiandomenico </FONT><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(incorporated by reference to Exhibit&nbsp;10.2 of the Company&rsquo;s Form&nbsp;8-K filed with the Securities and Exchange Commission on May&nbsp;27, 2025)</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465925052998/tm2516138d1_ex10-3.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.20+</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465925052998/tm2516138d1_ex10-3.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Louis J. Basenese&rsquo;s Offer Letter, effective as of May&nbsp;22, 2025 (incorporated by reference to Exhibit&nbsp;10.3 of the Company&rsquo;s Form&nbsp;8-K filed with the Securities and Exchange Commission on May&nbsp;27, 2025)</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465925052998/tm2516138d1_ex10-4.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">10.21+</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000110465925052998/tm2516138d1_ex10-4.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Anthony DiGiandomenico&rsquo;s Offer Letter, effective as of May&nbsp;22, 2025 (incorporated by reference to Exhibit&nbsp;10.4 of the Company&rsquo;s Form&nbsp;8-K filed with the Securities and Exchange Commission on May&nbsp;27, 2025)</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000114420419013533/tv512925_ex21.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">21.1</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="https://www.sec.gov/Archives/edgar/data/1434524/000114420419013533/tv512925_ex21.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Subsidiaries of the registrant (incorporated by reference to Exhibit&nbsp;21 to the Company&rsquo;s Form&nbsp;10-K filed with the Securities and Exchange Commission on March&nbsp;31, 2022).</FONT></A></TD></TR>
</TABLE>

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

<P STYLE="margin: 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="margin: 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: top">
    <TD STYLE="text-align: center; width: 10%"><A HREF="tm2523037d1_ex23-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">23.1*</FONT></A></TD>
    <TD STYLE="width: 3%">&nbsp;</TD>
    <TD STYLE="text-align: justify; width: 87%"><A HREF="tm2523037d1_ex23-1.htm" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Consent of BPM CPA LLP,&nbsp;Independent Registered Public Accounting Firm.</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="tm2523037d1_ex5-1.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">23.2*</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="tm2523037d1_ex5-1.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Consent of Mitchell Silberberg&nbsp;&amp; Knupp LLP (included in Exhibit&nbsp;5.1).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><A HREF="#a_016" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">24.1*</FONT></A></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><A HREF="#a_016" STYLE="-sec-extract: exhibit"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Power of Attorney (included on the signature page&nbsp;of this registration statement). </FONT></A></TD></TR>
  <TR>
    <TD STYLE="vertical-align: top; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="tm2523037d1_ex-filingfees.htm">107*</A></FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="tm2523037d1_ex-filingfees.htm">Filing Fee Table.</A></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; background-color: white">* Filed herewith.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">+ Agreement with management or compensatory
plan or arrangement.</P>

<P STYLE="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>

<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: 10%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Item 17.</B></FONT></TD>
    <TD STYLE="width: 90%; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Undertakings.</B></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: 0.35in">The undersigned registrant hereby undertakes:</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: 0.1in">&nbsp;</TD>
    <TD STYLE="width: 0.25in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(1)</FONT></TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:</FONT></TD></TR>
  </TABLE>
<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: 0.35in">&nbsp;</TD>
    <TD STYLE="width: 0.25in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(i)</FONT></TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">To include any prospectus required by Section&nbsp;10(a)(3)&nbsp;of the Securities Act;</FONT></TD></TR>
  </TABLE>
<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: 0.35in">&nbsp;</TD>
    <TD STYLE="width: 0.25in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(ii)</FONT></TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">To reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the SEC pursuant to Rule&nbsp;424(b)&nbsp;if, in the aggregate, the changes in volume and price represent no more than a 20% change in the maximum aggregate offering price set forth in the &ldquo;<I>Calculation of Registration Fee</I>&rdquo; table in the effective registration statement; and</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&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: 0.35in; text-align: justify">&nbsp;</TD>
    <TD STYLE="width: 0.25in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(iii)</FONT></TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">To include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement;&nbsp;<I>provided, however</I>, that the undertakings set forth in paragraphs (1)(i), (1)(ii)&nbsp;and (1)(iii)&nbsp;do not apply if the&nbsp;information required to be included in a post-effective amendment by those paragraphs is contained in reports&nbsp;filed with or furnished to the Commission by the registrant pursuant to Section&nbsp;13 or Section&nbsp;15(d)&nbsp;of the&nbsp;Securities Exchange Act of 1934 that are incorporated by reference in this registration statement, or is contained&nbsp;in a form of prospectus filed pursuant to Rule&nbsp;424(b)&nbsp;that is part of the registration statement.</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&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: 0.1in">&nbsp;</TD>
    <TD STYLE="width: 0.25in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(2)</FONT></TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">That, for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial&nbsp;<I>bona&nbsp;fide</I>&nbsp;offering thereof.</FONT></TD></TR>
  </TABLE>
<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: 0.1in; text-align: justify">&nbsp;</TD>
    <TD STYLE="width: 0.25in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(3)</FONT></TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&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: 0.1in; text-align: justify">&nbsp;</TD>
    <TD STYLE="width: 0.25in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(4)</FONT></TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">That, for purpose of determining liability under the Securities Act of 1933 to any purchaser:</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&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: 0.35in; text-align: justify">&nbsp;</TD>
    <TD STYLE="width: 0.25in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(i)</FONT></TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Each prospectus filed by the registrant pursuant to Rule&nbsp;424(b)(3)&nbsp;shall be deemed to be part of the registration statement as of the date the filed prospectus was deemed part of and included in the registration statement; and</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&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: 0.35in; text-align: justify">&nbsp;</TD>
    <TD STYLE="width: 0.25in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(ii)</FONT></TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Each prospectus required to be filed pursuant to Rule&nbsp;424(b)(2), (b)(5), or (b)(7)&nbsp;as part of a registration statement in reliance on Rule&nbsp;430B relating to an offering made pursuant to Rule&nbsp;415(a)(1)(i), (vii), or (x)&nbsp;for the purpose of providing the information required by Section&nbsp;10(a)&nbsp;of the Securities Act of 1933 shall be deemed to be part of and included in the registration statement as of the earlier of the date such form of prospectus is first used after effectiveness or the date of the first contract of sale of securities in the offering described in the prospectus. As provided in Rule&nbsp;430B, for liability purposes of the issuer and any person that is at that date an underwriter, such date shall be deemed to be a new effective date of the registration statement relating to the securities in the registration statement to which that prospectus relates, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof;&nbsp;<I>provided, however</I>, that no statement made in a registration statement or prospectus that is part of the&nbsp;registration statement or made in a document incorporated or deemed incorporated by reference into the&nbsp;registration statement or prospectus that is part of the registration statement will, as to a purchaser with a time of&nbsp;contract of sale prior to such effective date, supersede or modify any statement that was made in the registration&nbsp;statement or prospectus that was part of the registration statement or made in any such document immediately&nbsp;prior to such effective date.</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&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: 0.1in; text-align: justify">&nbsp;</TD>
    <TD STYLE="width: 0.25in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(5)</FONT></TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">That, for the purpose of determining liability of the registrant under the Securities Act of 1933 to any purchaser in the initial distribution of the securities: The undersigned registrant undertakes that in a primary offering of securities of the undersigned registrant pursuant to this registration statement, regardless of the underwriting method used to sell the securities to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the undersigned registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser:</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&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: 0.35in; text-align: justify">&nbsp;</TD>
    <TD STYLE="width: 0.25in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(i)</FONT></TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Any preliminary prospectus or prospectus of the undersigned registrant relating to the offering required to be filed pursuant to Rule&nbsp;424;</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&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: 0.35in; text-align: justify">&nbsp;</TD>
    <TD STYLE="width: 0.25in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(ii)</FONT></TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Any free writing prospectus relating to the offering prepared by or on behalf of the undersigned registrant or used or referred to by the undersigned registrant;</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&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: 0.35in; text-align: justify">&nbsp;</TD>
    <TD STYLE="width: 0.25in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(iii)</FONT></TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">The portion of any other free writing prospectus relating to the offering containing material information about the undersigned registrant or its securities provided by or on behalf of the undersigned registrant; and</FONT></TD></TR>
  </TABLE>
<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: 0.35in; text-align: justify">&nbsp;</TD>
    <TD STYLE="width: 0.25in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(iv)</FONT></TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Any other communication that is an offer in the offering made by the undersigned registrant to the purchaser.</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

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

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&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: 0.1in; text-align: justify">&nbsp;</TD>
    <TD STYLE="width: 0.25in; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(6)</FONT></TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">That, for purposes of determining any liability under the Securities Act of 1933, each filing of the registrant&rsquo;s annual report pursuant to Section&nbsp;13(a)&nbsp;or Section&nbsp;15(d)&nbsp;of the Securities Exchange Act of 1934 of a third party that is incorporated by reference in the registration statement in accordance with Item 1100(c)(1)&nbsp;of Regulation AB shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.</FONT></TD></TR>
  </TABLE>
<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: 0.1in">&nbsp;</TD>
    <TD STYLE="width: 0.25in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(7)</FONT></TD>
    <TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Act and will be governed by the final adjudication of such issue.</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">&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-top: 0pt; margin-bottom: 0pt; text-align: center"><B>SIGNATURES</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 accordance with the requirements of the Securities
Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form&nbsp;S-1
and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City
of Tulsa, State of Oklahoma, on August&nbsp;12, 2025.</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>&nbsp;</TD>
    <TD COLSPAN="2"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>CLEARSIGN TECHNOLOGIES CORPORATION</B></FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 50%">&nbsp;</TD>
    <TD STYLE="width: 3%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">By:</FONT></TD>
    <TD STYLE="width: 47%; border-bottom: black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ Colin James Deller</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD COLSPAN="2"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Colin James Deller, Chief Executive Officer</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-align: center"><A NAME="a_016"></A><B>POWER OF ATTORNEY</B></P>

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

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">KNOW ALL PERSONS BY THESE PRESENTS, that each person
whose signature appears below hereby constitutes and appoints Colin James Deller and Brent Hinds as the undersigned&rsquo;s true and lawful
attorney-in-fact and agent, with full power of substitution and resubstitution, for the undersigned and in the undersigned&rsquo;s name,
place and stead in any and all capacities, in connection with this registration statement, including to sign in the name and on behalf
of the undersigned, this registration statement and any and all amendments thereto, including post-effective amendments and registrations
filed pursuant to Rule&nbsp;462 under the Securities Act of 1933, as amended, and to file the same, with all exhibits thereto, and other
documents in connection therewith, with the Securities and Exchange Commission, granting unto such attorney-in-fact and agent full power
and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to
all intents and purposes as the undersigned might or could do in person, hereby ratifying and confirming all that said attorney-in-fact
and agents, or his substitute, may lawfully do or cause to be done by virtue hereof.</P>

<P STYLE="font: 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 accordance with the requirements of the Securities
Act of 1933, as amended, this registration statement has been signed by the following persons in the capacities and on the dates indicated.</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: 50%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Dated: August&nbsp;12, 2025</FONT></TD>
    <TD STYLE="width: 50%; border-bottom: black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ Colin James Deller</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Colin James Deller</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Chief Executive Officer</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(Principal Executive Officer)</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Dated: August&nbsp;12, 2025</FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ Brent Hinds</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Brent Hinds</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Chief Financial Officer</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(Principal Financial and Accounting Officer)</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Dated: August&nbsp;12, 2025</FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ Louis J. Basenese</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Louis J. Basenese, Director</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Dated: August&nbsp;12, 2025</FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ Anthony DiGiandomenico</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Anthony DiGiandomenico, Director</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Dated: August&nbsp;12, 2025</FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ G. Todd Silva</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">G. Todd Silva, Director </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"></P>

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<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>tm2523037d1_ex5-1.htm
<DESCRIPTION>EXHIBIT 5.1
<TEXT>
<HTML>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><B>Exhibit 5.1</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><IMG SRC="tm2523037d1ex5-1img001.jpg" ALT="">&nbsp;</P>

<P STYLE="border-top: Black 1pt solid; font: small-caps 14pt Times New Roman, Times, Serif; margin: 0pt 0">Mitchell Silberberg <FONT STYLE="font-family: Times New Roman, Times, Serif">&amp;</FONT>
Knupp llp</P>

<P STYLE="margin: 0pt 0; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-variant: small-caps">A Law Partnership Including
Professional Corporations</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">August 12, 2025</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">ClearSign Technologies Corporation<BR>
8023 E. 63rd Place, Suite 101</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Tulsa, Oklahoma 74133</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: 0in"><B>Re: ClearSign Technologies
Corporation - Registration Statement on Form S-1</B></P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">We have acted as counsel to
ClearSign Technologies Corporation, a Delaware corporation (the &ldquo;<U>Company</U>&rdquo;), in connection with the preparation and
filing with the Securities and Exchange Commission (the &ldquo;<U>Commission</U>&rdquo;) on August 12, 2025, under the Securities Act
of 1933, as amended (the &ldquo;<U>Act</U>&rdquo;), of the Company&rsquo;s registration statement on Form S-1 (the &ldquo;<U>Registration
Statement</U>&rdquo;), relating to the offer, sale and issuance of up to 5,267,222 shares (the &ldquo;<U>Warrant Shares</U>&rdquo;) of
the Company&rsquo;s common stock, par value $0.0001 per share, upon the exercise from time to time of the Company&rsquo;s outstanding
redeemable warrants issued on April 23, 2024 (the &ldquo;<U>Warrants</U>&rdquo;).</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in; background-color: white">The
Warrants were sold by the Company pursuant to that certain Underwriting Agreement, dated April 19, 2024 (the &ldquo;<U>Underwriting Agreement</U>&rdquo;),
entered into by and between the Company and Public Ventures, LLC, as representative of the underwriters named therein, a copy of which
has been filed with the Commission as Exhibit 1.1 to the Company&rsquo;s Current Report on Form&nbsp;8-K on April 19, 2024. The Warrant
Shares may be sold by the Company from time to time on a delayed or continuous basis pursuant to Rule 415 under the Act upon the exercise
of the Warrants, as set forth in the Registration Statement (and any amendments thereto) and the prospectus contained therein.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">We advise you that we have
also examined (i) the Certificate of Incorporation of the Company, as amended and as currently in effect; (ii) the Bylaws of the Company
as currently in effect; (iii) the Registration Statement and the exhibits thereto; (iv) the prospectus contained within the Registration
Statement; (v) the Underwriting Agreement; (vi) the Warrants; (vii) such corporate records, agreements, documents and other instruments;
and (viii) such certificates or comparable documents of public officials and other sources believed by us to be reliable, and of officers
and representatives of the Company, and have made such inquiries of such officers and representatives, as we have deemed relevant and
necessary as a basis for the opinions hereinafter set forth. In such examination, we have assumed the genuineness of all signatures, the
legal capacity of all natural persons, the authenticity of all documents submitted to us as originals, the conformity to original documents
of all documents submitted to us as certified, conformed or photostatic copies and the authenticity of the originals of such latter documents.
As to all questions of fact material to this opinion that have not been independently established, we have relied upon certificates or
comparable documents of officers and representatives of the Company.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">Our opinions expressed below
are subject to the qualifications that we express no opinion as to the applicability of, compliance with or effect of: (i) any bankruptcy,
insolvency, reorganization, preference, fraudulent conveyance, fraudulent transfer, moratorium or other similar laws relating to or affecting
the rights and remedies of creditors generally; (ii) general principles of equity, whether considered in a proceeding in equity or at
law (including the possible unavailability of specific performance or injunctive relief), concepts of materiality, reasonableness, good
faith and fair dealing, and the discretion of the court before which a proceeding is brought; or (iii) public policy considerations that
may limit the rights of parties to obtain certain remedies.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">We express no opinion as to
(i) any provision providing for the indemnification of or contribution to a party with respect to a liability where such indemnification
or contribution is contrary to public policy, (ii) consents to, or restrictions upon, governing law, jurisdiction, venue, arbitration,
remedies or judicial relief, (iii) the securities or &ldquo;Blue Sky&rdquo; laws of any state to the offer or sale of the Warrants and
Warrant Shares and (iv) the antifraud provisions of the securities or other laws of any jurisdiction.</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="border-top: Black 1pt solid; width: 50%"><FONT STYLE="font-size: 8pt">&nbsp;</FONT></TD>
    <TD STYLE="border-top: Black 1pt solid; width: 50%; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 8pt">437 Madison
    Ave., 25th Floor, New York, New York 10022-7001</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD><FONT STYLE="font-size: 8pt">&nbsp;</FONT></TD>
    <TD STYLE="font: small-caps 10pt Times New Roman, Times, Serif; text-transform: none"><FONT STYLE="font-size: 8pt">Phone: (212) 509-3900
    Fax: (212) 509-7239 Website: www.msk.com</FONT></TD></TR>
  </TABLE>


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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0"><IMG SRC="tm2523037d1ex5-1img001.jpg" ALT="" STYLE="width: 138px; height: 51px">&nbsp;</P>

<P STYLE="border-top: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0">August 12, 2025</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0">Page 2</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">Based upon the foregoing,
and subject to the assumptions, exceptions, qualifications and limitations set forth herein, we are of the opinion that the Warrant Shares,
when issued and delivered upon exercise of the Warrants against payment of the exercise price therefor, will be validly issued, fully
paid and non-assessable.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">This opinion is being furnished
in connection with the requirements of Item 601(b)(5) of Regulation S-K under the Act, and no opinion is expressed herein as to any matter
pertaining to the contents of the Registration Statement, other than as expressly stated herein with respect to the issuance of the Warrant
Shares. This opinion is opining upon and is limited to the current federal laws of the United States and the General Corporation Law of
the State of Delaware and the laws of the State of New York, as such laws presently exist and to the facts as they presently exist. We
express no opinion with respect to the effect or applicability of the laws of any other jurisdiction. We assume no obligation to revise
or supplement this opinion letter should the laws of such jurisdiction be changed after the date hereof by legislative action, judicial
decision, or otherwise.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">We hereby consent to the use
of this opinion as an exhibit to the Registration Statement, to the use of our name as the Company&rsquo;s counsel and to all references
made to us in the Registration Statement and in the prospectus forming a part thereof. In giving this consent, we do not admit that we
are in the category of persons whose consent is required under Section 7 of the Act, or the rules and regulations promulgated thereunder.
This opinion is given as of the date hereof, and we are under no duty to update the opinions contained herein.</P>

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

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 50%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 50%; font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">Very truly yours,</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">/s/ Mitchell Silberberg &amp; Knupp LLP</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">MITCHELL SILBERBERG &amp; KNUPP LLP</FONT></TD></TR>
  </TABLE>

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

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

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


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</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>3
<FILENAME>tm2523037d1_ex23-1.htm
<DESCRIPTION>EXHIBIT 23.1
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><B>Exhibit&nbsp;23.1</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-variant: small-caps"><B>Consent
of Independent Registered Public Accounting Firm</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: justify">We hereby consent to the incorporation by reference
in this Registration Statement on Form&nbsp;S-1 of our report dated March&nbsp;31, 2025 relating to the consolidated financial statements,
which appears in the Annual Report on Form&nbsp;10-K of ClearSign Technologies Corporation for the year ended December&nbsp;31, 2024.
We also consent to the reference to us under the heading &ldquo;Experts&rdquo; in such Registration 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">/s/ BPM CPA LLP</P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">August&nbsp;12, 2025</P>

<P STYLE="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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    <!-- Field: /Page -->

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

</BODY>
</HTML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-FILING FEES
<SEQUENCE>4
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<DESCRIPTION>EX-FILING FEES
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              <b>Calculation of Filing Fee Tables</b>
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            <!-- BLANK -->
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          <th style="width: 14%;">
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              <b>Security Class Title </b>
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          <th style="width: 15%;">
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              <b>Proposed Maximum Offering Price Per Unit</b>
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              <b>Fee Rate</b>
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              <b>Amount of Registration Fee</b>
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		1
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          </td>
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	</td>
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            <span>$</span>
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          </td>
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            <ix:nonFraction name="ffd:FeeRate" unitRef="pure" decimals="INF" format="ixt:numdotdecimal" contextRef="offrl_1" id="ixv-404">0.0001531</ix:nonFraction>
          </td>
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            <span>$</span>
            <ix:nonFraction name="ffd:FeeAmt" unitRef="USD" decimals="INF" format="ixt:numdotdecimal" contextRef="offrl_1" id="ixv-405">444.05</ix:nonFraction>
          </td>
          <td style="text-align: center;">

	</td>
          <td style="text-align: center;">

	</td>
          <td style="text-align: center;">

	</td>
          <td style="text-align: right;">

	</td>
        </tr>
        <tr style="background-color:#E7E7E2">
          <td style="text-align: left;">
            <ix:nonNumeric name="ffd:PrevslyPdFlg" contextRef="offrl_2" format="ixt:booleanfalse" id="ixv-406">Fees to be Paid</ix:nonNumeric>
          </td>
          <td style="text-align: center;">
		2
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          <td style="text-align: left;">
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            <ix:nonNumeric name="ffd:FeesOthrRuleFlg" contextRef="offrl_2" format="ixt:booleantrue" id="ixv-409">Other</ix:nonNumeric>
          </td>
          <td style="text-align: right;">
            <ix:nonFraction name="ffd:AmtSctiesRegd" unitRef="Shares" decimals="0" format="ixt:numdotdecimal" contextRef="offrl_2" id="ixv-410">5,267,222</ix:nonFraction>
          </td>
          <td style="text-align: right;">

	</td>
          <td style="text-align: right;">
            <span>$</span>
            <ix:nonFraction name="ffd:MaxAggtOfferingPric" unitRef="USD" decimals="INF" format="ixt:numdotdecimal" contextRef="offrl_2" id="ixv-411">0.00</ix:nonFraction>
          </td>
          <td style="text-align: right;">
            <ix:nonFraction name="ffd:FeeRate" unitRef="pure" decimals="INF" format="ixt:numdotdecimal" contextRef="offrl_2" id="ixv-412">0.0001531</ix:nonFraction>
          </td>
          <td style="text-align: right;">
            <span>$</span>
            <ix:nonFraction name="ffd:FeeAmt" unitRef="USD" decimals="INF" format="ixt:numdotdecimal" contextRef="offrl_2" id="ixv-413">0.00</ix:nonFraction>
          </td>
          <td style="text-align: center;">

	</td>
          <td style="text-align: center;">

	</td>
          <td style="text-align: center;">

	</td>
          <td style="text-align: right;">

	</td>
        </tr>
        <tr style="background-color:#E7E7E2">
          <td style="text-align: left;">
		Fees Previously Paid
	</td>
          <td style="text-align: center;">

	</td>
          <td style="text-align: left;">

	</td>
          <td style="text-align: left;">

	</td>
          <td style="text-align: center;">

	</td>
          <td style="text-align: right;">

	</td>
          <td style="text-align: right;">

	</td>
          <td style="text-align: right;">

	</td>
          <td style="text-align: right;">

	</td>
          <td style="text-align: right;">

	</td>
          <td style="text-align: center;">

	</td>
          <td style="text-align: center;">

	</td>
          <td style="text-align: center;">

	</td>
          <td style="text-align: right;">

	</td>
        </tr>
        <tr>
          <td colspan="14" style="text-align: center">
            <b>Carry Forward Securities</b>
          </td>
        </tr>
        <tr style="background-color:#E7E7E2">
          <td style="text-align: left;">
		Carry Forward Securities
	</td>
          <td style="text-align: center;">

	</td>
          <td style="text-align: left;">

	</td>
          <td style="text-align: left;">

	</td>
          <td style="text-align: center;">

	</td>
          <td style="text-align: right;">

	</td>
          <td style="text-align: right;">

	</td>
          <td style="text-align: right;">

	</td>
          <td style="text-align: right;">

	</td>
          <td style="text-align: right;">

	</td>
          <td style="text-align: center;">

	</td>
          <td style="text-align: center;">

	</td>
          <td style="text-align: center;">

	</td>
          <td style="text-align: right;">

	</td>
        </tr>
        <tr>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td colspan="3" style="vertical-align: top">
            <p style="margin: 0pt; text-align: right">Total Offering Amounts:</p>
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td style="vertical-align: top; width: 16%;">
            <p id="MaxAggtOfferingPrice" style="margin: 0pt; text-align: right">
              <span>$</span>
              <ix:nonFraction name="ffd:TtlOfferingAmt" contextRef="rc" decimals="INF" format="ixt:numdotdecimal" unitRef="USD" id="ixv-414">2,900,395.79</ix:nonFraction>
            </p>
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td style="vertical-align: top; border-bottom: 1px black; width: 16%;">
            <p id="TotalFeeAmt" style="margin: 0pt; text-align: right">
              <span>$</span>
              <ix:nonFraction name="ffd:TtlFeeAmt" contextRef="rc" decimals="INF" format="ixt:numdotdecimal" unitRef="USD" id="ixv-415">444.05</ix:nonFraction>
            </p>
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
        </tr>
        <tr>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td colspan="3" style="vertical-align: top">
            <p style="margin: 0pt; text-align: right">
					Total Fees Previously Paid:
				</p>
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td style="vertical-align: top">
            <p id="TotalPreviouslyPaidAmt" style="margin: 0pt; text-align: right">
              <span>$</span>
              <ix:nonFraction name="ffd:TtlPrevslyPdAmt" contextRef="rc" decimals="INF" format="ixt:numdotdecimal" unitRef="USD" id="ixv-416">0.00</ix:nonFraction>
            </p>
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
        </tr>
        <tr>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td colspan="3" style="vertical-align: top">
            <p style="margin: 0pt; text-align: right">
					Total Fee Offsets:
				</p>
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td style="vertical-align: top">
            <p id="TotalOffsetAmt" style="margin: 0pt; text-align: right">
              <span>$</span>
              <ix:nonFraction name="ffd:TtlOffsetAmt" contextRef="rc" decimals="INF" format="ixt:numdotdecimal" unitRef="USD" id="ixv-417">0.00</ix:nonFraction>
            </p>
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
        </tr>
        <tr>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td colspan="3" style="vertical-align: top">
            <p style="margin: 0pt; text-align: right">
					Net Fee Due:
				</p>
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td style="vertical-align: top">
            <p id="NetFeeAmt" style="margin: 0pt; text-align: right">
              <span>$</span>
              <ix:nonFraction name="ffd:NetFeeAmt" contextRef="rc" decimals="INF" format="ixt:numdotdecimal" unitRef="USD" id="ixv-418">444.05</ix:nonFraction>
            </p>
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
          <td>
            <!-- BLANK -->
          </td>
        </tr>
      </table>
    </div>
    <div>
      <table style="width: 100%; text-indent: 0px;">
        <tbody>
          <tr style="font-family: Arial, Helvetica, sans-serif; font-size: 16px; vertical-align: top;">
            <td>
              <p style="margin:0pt;text-align:left; margin-bottom: 5px;">
                <b>Offering Note</b>
              </p>
            </td>
            <td/>
          </tr>
        </tbody>
      </table>
    </div>
    <div style="padding-bottom: 20px;">
      <table style="width: 100%; text-indent: 0px;">
        <tr style="font-family: Arial, Helvetica, sans-serif; font-size: 16px; vertical-align: top;">
          <td style="width:10pt;">
            <p style="margin:0pt;text-align:left;">
              <sup style="vertical-align:top;line-height:120%;font-size:10px">1</sup>
            </p>
          </td>
          <td colspan="7" style="white-space: pre-line;">
            <ix:nonNumeric name="ffd:OfferingNote" escape="1" contextRef="offrl_1" id="ixv-419">(1a)	 Represents shares of common stock issuable upon the exercise of redeemable warrants to purchase common stock at an exercise price of $1.05 per share, subject to adjustment in accordance with the terms of the redeemable warrants, issued by the registrant on April 23, 2024 and May 15, 2024, to be offered and sold from time to time by the holders thereof.

(1b)	 Estimated solely for the purpose of calculating the registration fee, based on the average of the high and low prices of the common stock on the Nasdaq Capital Market on August 11, 2025 (such date being within five business days of the date that this registration statement was filed with the Securities and Exchange Commission). This calculation is in accordance with Rule 457(c) of the Securities Act of 1933, as amended (the "Securities Act").</ix:nonNumeric>
          </td>
        </tr>
        <tr>
          <td colspan="7">
            <hr style="width:100%;text-align:left;margin-left:0"/>
          </td>
        </tr>
        <tr style="font-family: Arial, Helvetica, sans-serif; font-size: 16px; vertical-align: top;">
          <td style="width:10pt;">
            <p style="margin:0pt;text-align:left;">
              <sup style="vertical-align:top;line-height:120%;font-size:10px">2</sup>
            </p>
          </td>
          <td colspan="7" style="white-space: pre-line;">
            <ix:nonNumeric name="ffd:OfferingNote" escape="1" contextRef="offrl_2" id="ixv-420">No separate registration fee is payable pursuant to Rule 457(g) of the Securities Act.</ix:nonNumeric>
          </td>
        </tr>
        <tr>
          <td colspan="7">
            <hr style="width:100%;text-align:left;margin-left:0"/>
          </td>
        </tr>
      </table>
    </div>
    <div style="padding-bottom: 20px;">
      <table style="float: center; width: 100%; text-align: left;  ">
        <tr style="font-family: Arial, Helvetica, sans-serif; font-size: 16px">
          <th style="vertical-align: bottom; text-align: left; word-wrap: break-word">
            <b>Table 2: Fee Offset Claims and Sources</b>
          </th>
          <th style="vertical-align: bottom; word-wrap: break-word; text-align: right;">
            <span style="-sec-ix-hidden: hiddenrcOffsetTableNa">&#9745;Not Applicable</span>
          </th>
        </tr>
      </table>
      <table style="font-family: Arial, Helvetica, sans-serif; font-size: 16px; float: center; width: 100%; text-align: center;  border: 1px solid black;">
        <tr style="background-color:#9ADAF6">
          <th style="width: 10%; text-align: left;">
            <!-- BLANK -->
          </th>
          <th style="width: 8%; text-align: left;">
            <!-- BLANK -->
          </th>
          <th style="width: 16%;">
				Registrant or Filer Name
			</th>
          <th style="width: 6%;">
				Form or Filing Type
			</th>
          <th style="width: 7%;">
				File Number
			</th>
          <th style="width: 6%;">
				Initial Filing Date
			</th>
          <th style="width: 6%;">
				Filing Date
			</th>
          <th style="width: 6%;">
				Fee Offset Claimed
			</th>
          <th style="width: 6%;">
				Security Type Associated with Fee Offset Claimed
			</th>
          <th style="width: 8%;">
				Security Title Associated with Fee Offset Claimed
			</th>
          <th style="width: 6%;">
				Unsold Securities Associated with Fee Offset Claimed
			</th>
          <th style="width: 9%;">
				Unsold Aggregate Offering Amount Associated with Fee Offset Claimed
			</th>
          <th style="width: 6%;">
				Fee Paid with Fee Offset Source
			</th>
        </tr>
        <tr>
          <td colspan="14" style="text-align: center">
            <b>Rules 457(b) and 0-11(a)(2)</b>
          </td>
        </tr>
        <tr style="background-color:#E7E7E2">
          <td style="text-align: left;">
		Fee Offset Claims
	</td>
          <td>
		N/A
	</td>
          <td style="text-align: left;">
		N/A
	</td>
          <td>
		N/A
	</td>
          <td>
		N/A
	</td>
          <td>
		N/A
	</td>
          <td>
		N/A
	</td>
          <td style="text-align: right;">
		N/A
	</td>
          <td style="text-align: left;">
		N/A
	</td>
          <td style="text-align: left;">
		N/A
	</td>
          <td style="text-align: right;">
		N/A
	</td>
          <td style="text-align: right;">
		N/A
	</td>
          <td style="text-align: right;">
		N/A
	</td>
        </tr>
        <tr style="background-color:#E7E7E2">
          <td style="text-align: left;">
		Fee Offset Sources
	</td>
          <td>
		N/A
	</td>
          <td style="text-align: left;">
		N/A
	</td>
          <td>
		N/A
	</td>
          <td>
		N/A
	</td>
          <td>
		N/A
	</td>
          <td>
		N/A
	</td>
          <td style="text-align: right;">
		N/A
	</td>
          <td style="text-align: left;">
		N/A
	</td>
          <td style="text-align: left;">
		N/A
	</td>
          <td style="text-align: right;">
		N/A
	</td>
          <td style="text-align: right;">
		N/A
	</td>
          <td style="text-align: right;">
		N/A
	</td>
        </tr>
        <tr>
          <td colspan="14" style="text-align: center">
            <b>Rule 457(p)</b>
          </td>
        </tr>
        <tr style="background-color:#E7E7E2">
          <td style="text-align: left;">
		Fee Offset Claims
	</td>
          <td>
		N/A
	</td>
          <td style="text-align: left;">
		N/A
	</td>
          <td>
		N/A
	</td>
          <td>
		N/A
	</td>
          <td>
		N/A
	</td>
          <td>
		N/A
	</td>
          <td style="text-align: right;">
		N/A
	</td>
          <td style="text-align: left;">
		N/A
	</td>
          <td style="text-align: left;">
		N/A
	</td>
          <td style="text-align: right;">
		N/A
	</td>
          <td style="text-align: right;">
		N/A
	</td>
          <td style="text-align: right;">
		N/A
	</td>
        </tr>
        <tr style="background-color:#E7E7E2">
          <td style="text-align: left;">
		Fee Offset Sources
	</td>
          <td>
		N/A
	</td>
          <td style="text-align: left;">
		N/A
	</td>
          <td>
		N/A
	</td>
          <td>
		N/A
	</td>
          <td>
		N/A
	</td>
          <td>
		N/A
	</td>
          <td style="text-align: right;">
		N/A
	</td>
          <td style="text-align: left;">
		N/A
	</td>
          <td style="text-align: left;">
		N/A
	</td>
          <td style="text-align: right;">
		N/A
	</td>
          <td style="text-align: right;">
		N/A
	</td>
          <td style="text-align: right;">
		N/A
	</td>
        </tr>
      </table>
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        <tr style="font-family: Arial, Helvetica, sans-serif; font-size: 16px">
          <th style="vertical-align: bottom; text-align: left; word-wrap: break-word">
            <b>Table 3: Combined Prospectuses</b>
          </th>
          <th style="vertical-align: bottom; word-wrap: break-word; text-align: right;">
            <span style="-sec-ix-hidden: hiddenrcCombinedProspectusTableNa">&#9745;Not Applicable</span>
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              <b>Security Type</b>
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              <b>Security Class Title</b>
            </p>
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              <b>Amount of Securities Previously Registered</b>
            </p>
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            </p>
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          <td style="text-align: center;">
		N/A
	</td>
          <td>
		N/A
	</td>
          <td>
		N/A
	</td>
          <td style="text-align: right;">
		N/A
	</td>
          <td style="text-align: right;">
		N/A
	</td>
          <td style="text-align: center;">
		N/A
	</td>
          <td style="text-align: center;">
		N/A
	</td>
          <td style="text-align: center;">
		N/A
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<head>
<title></title>
<link rel="stylesheet" type="text/css" href="include/report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<body>
<span style="display: none;">v3.25.2</span><table class="report" border="0" cellspacing="2" id="id2">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Submission<br></strong></div></th>
<th class="th"><div>Aug. 12, 2025</div></th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_SubmissionLineItems', window );"><strong>Submission [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Central Index Key</a></td>
<td class="text">0001434524<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Registrant Name</a></td>
<td class="text">ClearSign Technologies Corp<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_FormTp', window );">Form Type</a></td>
<td class="text">S-1<span></span>
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<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_SubmissnTp', window );">Submission Type</a></td>
<td class="text">S-1<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_FeeExhibitTp', window );">Fee Exhibit Type</a></td>
<td class="text">EX-FILING FEES<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_OfferingTableNa', window );">Offering Table N/A</a></td>
<td class="text"> <span></span>
</td>
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<td class="text">N/A<span></span>
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<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_CombinedProspectusTableNa', window );">Combined Prospectus Table N/A</a></td>
<td class="text">N/A<span></span>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<td style="white-space:nowrap;">dei_EntityCentralIndexKey</td>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityRegistrantName</td>
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<td>na</td>
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<td>duration</td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_ffd_CombinedProspectusTableNa">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">ffd_CombinedProspectusTableNa</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>ffd_</td>
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<td><strong> Data Type:</strong></td>
<td>ffd:naItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
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</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_ffd_FeeExhibitTp">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">ffd_FeeExhibitTp</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>ffd_</td>
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<td>ffd:feeExhibitTypeItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
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</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_ffd_FormTp">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">ffd_FormTp</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>ffd_</td>
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<td>ffd:submissionTypeItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td>duration</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">ffd_OfferingTableNa</td>
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<td>na</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">ffd_OffsetTableNa</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>ffd_</td>
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<td>na</td>
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<td>duration</td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_ffd_SubmissionLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">ffd_SubmissionLineItems</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">ffd_SubmissnTp</td>
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<DOCUMENT>
<TYPE>XML
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<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="include/report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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</head>
<body>
<span style="display: none;">v3.25.2</span><table class="report" border="0" cellspacing="2" id="id2">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Offerings<br></strong></div></th>
<th class="th">
<div>Aug. 12, 2025 </div>
<div>USD ($) </div>
<div>shares</div>
</th>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_OfferingAxis=1', window );">Offering: 1</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_OfferingTable', window );"><strong>Offering:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_PrevslyPdFlg', window );">Fee Previously Paid</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_FeesOthrRuleFlg', window );">Other Rule</a></td>
<td class="text">true<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_OfferingSctyTp', window );">Security Type</a></td>
<td class="text">Equity<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_OfferingSctyTitl', window );">Security Class Title</a></td>
<td class="text">Common stock, $0.0001 par value per share, issuable upon exercise of redeemable warrants<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_AmtSctiesRegd', window );">Amount Registered | shares</a></td>
<td class="nump">5,267,222<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_MaxAggtOfferingPric', window );">Maximum Aggregate Offering Price</a></td>
<td class="nump">$ 2,900,395.79<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_FeeRate', window );">Fee Rate</a></td>
<td class="nump">0.01531%<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_FeeAmt', window );">Amount of Registration Fee</a></td>
<td class="nump">$ 444.05<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_OfferingNote', window );">Offering Note</a></td>
<td class="text">(1a)	 Represents shares of common stock issuable upon the exercise of redeemable warrants to purchase common stock at an exercise price of $1.05 per share, subject to adjustment in accordance with the terms of the redeemable warrants, issued by the registrant on April 23, 2024 and May 15, 2024, to be offered and sold from time to time by the holders thereof.

(1b)	 Estimated solely for the purpose of calculating the registration fee, based on the average of the high and low prices of the common stock on the Nasdaq Capital Market on August 11, 2025 (such date being within five business days of the date that this registration statement was filed with the Securities and Exchange Commission). This calculation is in accordance with Rule 457(c) of the Securities Act of 1933, as amended (the "Securities Act").<span></span>
</td>
</tr>
<tr class="rh">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_OfferingAxis=2', window );">Offering: 2</a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_OfferingTable', window );"><strong>Offering:</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_PrevslyPdFlg', window );">Fee Previously Paid</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_FeesOthrRuleFlg', window );">Other Rule</a></td>
<td class="text">true<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_OfferingSctyTp', window );">Security Type</a></td>
<td class="text">Equity<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_OfferingSctyTitl', window );">Security Class Title</a></td>
<td class="text">Redeemable warrants<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_AmtSctiesRegd', window );">Amount Registered | shares</a></td>
<td class="nump">5,267,222<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_MaxAggtOfferingPric', window );">Maximum Aggregate Offering Price</a></td>
<td class="nump">$ 0.00<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_FeeRate', window );">Fee Rate</a></td>
<td class="nump">0.01531%<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_FeeAmt', window );">Amount of Registration Fee</a></td>
<td class="nump">$ 0.00<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_OfferingNote', window );">Offering Note</a></td>
<td class="text">No separate registration fee is payable pursuant to Rule 457(g) of the Securities Act.<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_ffd_AmtSctiesRegd">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The amount of securities being registered.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Securities Act<br> -Number 230<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">ffd_AmtSctiesRegd</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>ffd_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>ffd:nonNegativeDecimal2ItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_ffd_FeeAmt">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Total amount of registration fee (amount due after offsets).</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Securities Act<br> -Number 230<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">ffd_FeeAmt</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>ffd_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>ffd:nonNegative1TMonetary2ItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_ffd_FeeRate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The rate per dollar of fees that public companies and other issuers pay to register their securities with the Commission.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Securities Act<br> -Number 230<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">ffd_FeeRate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>ffd_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:percentItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_ffd_FeesOthrRuleFlg">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Checkbox indicating whether filer is using a rule other than 457(a), 457(o), or 457(f) to calculate the registration fee due.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Securities Act<br> -Number 230<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">ffd_FeesOthrRuleFlg</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>ffd_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_ffd_MaxAggtOfferingPric">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The maximum aggregate offering price for the offering that is being registered.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Securities Act<br> -Number 230<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">ffd_MaxAggtOfferingPric</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>ffd_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>ffd:nonNegative100TMonetary2ItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_ffd_OfferingNote">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Securities Act<br> -Number 230<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">ffd_OfferingNote</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>ffd_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dtr-types:textBlockItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_ffd_OfferingSctyTitl">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The title of the class of securities being registered (for each class being registered).</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Securities Act<br> -Number 230<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">ffd_OfferingSctyTitl</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>ffd_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>ffd:securityTitleItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_ffd_OfferingSctyTp">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Type of securities: "Asset-backed Securities", "ADRs/ADSs", "Debt", "Debt Convertible into Equity", "Equity", "Face Amount Certificates", "Limited Partnership Interests", "Mortgage Backed Securities", "Non-Convertible Debt", "Unallocated (Universal) Shelf", "Exchange Traded Vehicle Securities", "Other"</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Securities Act<br> -Number 230<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">ffd_OfferingSctyTp</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>ffd_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>ffd:securityTypeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_ffd_OfferingTable">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">ffd_OfferingTable</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>ffd_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_ffd_PrevslyPdFlg">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">ffd_PrevslyPdFlg</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>ffd_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_ffd_OfferingAxis=1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">ffd_OfferingAxis=1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_ffd_OfferingAxis=2">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Details</a><div><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">ffd_OfferingAxis=2</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td></td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td></td>
</tr>
</table></div>
</div></td></tr>
</table>
</div>
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</html>
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<DOCUMENT>
<TYPE>XML
<SEQUENCE>10
<FILENAME>R3.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="include/report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<span style="display: none;">v3.25.2</span><table class="report" border="0" cellspacing="2" id="id2">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Fees Summary<br></strong></div></th>
<th class="th">
<div>Aug. 12, 2025 </div>
<div>USD ($)</div>
</th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_FeesSummaryLineItems', window );"><strong>Fees Summary [Line Items]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_TtlOfferingAmt', window );">Total Offering</a></td>
<td class="nump">$ 2,900,395.79<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_TtlPrevslyPdAmt', window );">Previously Paid Amount</a></td>
<td class="nump">0.00<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_TtlFeeAmt', window );">Total Fee Amount</a></td>
<td class="nump">444.05<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_TtlOffsetAmt', window );">Total Offset Amount</a></td>
<td class="nump">0.00<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_ffd_NetFeeAmt', window );">Net Fee</a></td>
<td class="nump">$ 444.05<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_ffd_FeesSummaryLineItems">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- References</a><div><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Securities Act<br> -Number 230<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
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(1b)	 Estimated solely for the purpose of calculating the registration fee, based on the average of the high and low prices of the common stock on the Nasdaq Capital Market on August 11, 2025 (such date being within five business days of the date that this registration statement was filed with the Securities and Exchange Commission). This calculation is in accordance with Rule 457(c) of the Securities Act of 1933, as amended (the "Securities Act").</ffd:OfferingNote>
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