<SEC-DOCUMENT>0001144204-15-006098.txt : 20150205
<SEC-HEADER>0001144204-15-006098.hdr.sgml : 20150205
<ACCEPTANCE-DATETIME>20150205080427
ACCESSION NUMBER:		0001144204-15-006098
CONFORMED SUBMISSION TYPE:	424B5
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20150205
DATE AS OF CHANGE:		20150205

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CLEARSIGN COMBUSTION CORP
		CENTRAL INDEX KEY:			0001434524
		STANDARD INDUSTRIAL CLASSIFICATION:	INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL [3823]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			WA

	FILING VALUES:
		FORM TYPE:		424B5
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-188381
		FILM NUMBER:		15577456

	BUSINESS ADDRESS:	
		STREET 1:		12870 INTERURBAN AVENUE SOUTH
		CITY:			SEATTLE
		STATE:			WA
		ZIP:			98168
		BUSINESS PHONE:		(206) 673-4848

	MAIL ADDRESS:	
		STREET 1:		12870 INTERURBAN AVENUE SOUTH
		CITY:			SEATTLE
		STATE:			WA
		ZIP:			98168
</SEC-HEADER>
<DOCUMENT>
<TYPE>424B5
<SEQUENCE>1
<FILENAME>v400425_424b5.htm
<DESCRIPTION>424B5
<TEXT>
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<P STYLE="margin: 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right; color: #FF4040"><FONT STYLE="color: Black"><B>Filed
pursuant to Rule 424(b)(5)</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right; color: #FF4040"><FONT STYLE="color: Black"><B>Registration
No. 333-188381</B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>(To the Prospectus Dated May 30, 2013)</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><IMG SRC="tlogo.jpg" ALT=""></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">2,600,000 Shares of Common Stock</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We are offering up to 2,600,000 shares of
our common stock.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Our common stock
is currently traded on the NASDAQ Capital Market under the symbol &ldquo;CLIR&rdquo;.&nbsp; On February 4, 2015, the closing price
of our common stock was $6.11 per share.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We are an &ldquo;emerging growth company&rdquo;
within the meaning of the Jumpstart Our Business Startups Act of 2012, or the JOBS Act, and are subject to reduced public company
reporting requirements. See &ldquo;Prospectus Summary&mdash;Implications of Being an Emerging Growth Company.&rdquo;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B>Investing in our common stock involves
significant risks.&nbsp; Before buying any shares, you should read the discussion of material risks of investing in our common
stock in &ldquo;Risk Factors&rdquo; beginning on page S-7 of this prospectus supplement and page 6 of the accompanying prospectus.</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><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 supplement or the prospectus to which it relates. 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-indent: 0.5in">Certain of our officers and directors intend
to participate in this offering. For a discussion of the extent of their participation, please see the section of this prospectus
titled &ldquo;Underwriting&rdquo;.</P>

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

<P STYLE="margin: 0pt 0">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; MDB Capital
Group, LLC is the underwriter in connection with this offering. If we sell all of the common stock we are offering, we will pay
to MDB Capital Gr<FONT STYLE="font: 10pt Times New Roman, Times, Serif">oup, LLC approximately $912,600, or 6%, of the gross proceeds
of this offering and a non-accountable expense allowance of $55,000. For a more complete discussion of the compensation we will
pay to the underwriter, please see the section of this prospectus titled</FONT></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">&nbsp;</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font: bold 10pt Times New Roman, Times, Serif; text-align: center">Per Share</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font: bold 10pt Times New Roman, Times, Serif; text-align: center">Total</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">&nbsp;</TD><TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-size: 10pt">&nbsp;</TD><TD STYLE="font-size: 10pt">&nbsp;</TD><TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-size: 10pt">&nbsp;</TD><TD STYLE="font-size: 10pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 72%; font: 10pt Times New Roman, Times, Serif; padding-left: 5.4pt">Public offering price</TD><TD STYLE="width: 2%; font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="width: 1%; font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="width: 10%; font: 10pt Times New Roman, Times, Serif; text-align: right">5.850</TD><TD STYLE="width: 1%; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="width: 2%; font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="width: 1%; font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="width: 10%; font: 10pt Times New Roman, Times, Serif; text-align: right">15,210,000</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: White">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; padding-left: 5.4pt">Underwriting discounts and commissions</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">0.351</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">912,600</TD><TD STYLE="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-left: 5.4pt">Proceeds to us</TD><TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; text-align: left">&nbsp;</TD><TD STYLE="font-size: 10pt; text-align: right">&nbsp;</TD><TD STYLE="font-size: 10pt; text-align: left">&nbsp;</TD><TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; text-align: left">&nbsp;</TD><TD STYLE="font-size: 10pt; text-align: right">&nbsp;</TD><TD STYLE="font-size: 10pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left; padding-left: 5.4pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(before expenses)</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">5.499</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">14,297,400</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD></TR>
</TABLE>



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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The underwriter also may purchase an additional
390,000 shares of our common stock, amounting to 15% of the number of shares offered to the public, within 45 days of the date
of this prospectus supplement, to cover over-allotments, if any, on the same terms set forth above.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 20pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We anticipate delivery of the shares will
be made on or about February 10, 2015, subject to customary closing conditions.</P>



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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">This prospectus supplement is dated February
5, 2015</P>

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


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

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; 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: bottom">
    <TD STYLE="width: 94%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: center">&nbsp;</TD>
    <TD STYLE="width: 5%; border-bottom: Black 1pt solid; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Page</B></FONT></TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD></TR>
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top"><A HREF="#ps_1"><FONT STYLE="font: 10pt Times New Roman, Times, Serif; text-transform: uppercase">About this Prospectus Supplement</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">S-ii</FONT></TD></TR>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><A HREF="#ps_2"><FONT STYLE="font: 10pt Times New Roman, Times, Serif; text-transform: uppercase">Forward-Looking Statements</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">S-iii</FONT></TD></TR>
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top"><A HREF="#ps_3"><FONT STYLE="font: 10pt Times New Roman, Times, Serif; text-transform: uppercase">Prospectus Supplement Summary</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">S-1</FONT></TD></TR>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><A HREF="#ps_4"><FONT STYLE="font: 10pt Times New Roman, Times, Serif; text-transform: uppercase">Risk Factors</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">S-7</FONT></TD></TR>
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top"><A HREF="#ps_5"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">PRICE RANGE OF OUR COMMON STOCK</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">S-9</FONT></TD></TR>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><A HREF="#ps_6"><FONT STYLE="font: 10pt Times New Roman, Times, Serif; text-transform: uppercase">Use of Proceeds</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">S-9</FONT></TD></TR>
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top"><A HREF="#ps_7"><FONT STYLE="font: 10pt Times New Roman, Times, Serif; text-transform: uppercase">Capitalization</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">S-10</FONT></TD></TR>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><A HREF="#ps_8"><FONT STYLE="font: 10pt Times New Roman, Times, Serif; text-transform: uppercase">Dilution</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">S-11</FONT></TD></TR>
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top"><A HREF="#ps_9"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">UNDERWRITING</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">S-12</FONT></TD></TR>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><A HREF="#ps_10"><FONT STYLE="font: 10pt Times New Roman, Times, Serif; text-transform: uppercase">Legal Matters</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">S-15</FONT></TD></TR>
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top"><A HREF="#ps_11"><FONT STYLE="font: 10pt Times New Roman, Times, Serif; text-transform: uppercase">Experts</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">S-15</FONT></TD></TR>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><A HREF="#ps_12"><FONT STYLE="font: 10pt Times New Roman, Times, Serif; text-transform: uppercase">Where You Can Find More Information</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">S-15</FONT></TD></TR>
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top"><A HREF="#ps_13"><FONT STYLE="font: 10pt Times New Roman, Times, Serif; text-transform: uppercase">Incorporation of Certain Information by Reference</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">S-15</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"><B>Prospectus</B></P>

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top; width: 94%"><A HREF="#p1_001"><font style="font: 10pt Times New Roman, Times, Serif">ABOUT THIS PROSPECTUS</font></A></td>
    <TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 5%; text-align: left"><font style="font: 10pt Times New Roman, Times, Serif">1</font></td></tr>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_002">DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS</A></font></td>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: left"><font style="font: 10pt Times New Roman, Times, Serif">2</font></td></tr>
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_003">OUR BUSINESS</A></font></td>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: left"><font style="font: 10pt Times New Roman, Times, Serif">3</font></td></tr>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_004">RISK FACTORS</A></font></td>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: left"><font style="font: 10pt Times New Roman, Times, Serif">6</font></td></tr>
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_005">USE OF PROCEEDS</A></font></td>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: left"><font style="font: 10pt Times New Roman, Times, Serif">6</font></td></tr>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_006">DILUTION</A></font></td>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: left"><font style="font: 10pt Times New Roman, Times, Serif">6</font></td></tr>
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_007">DESCRIPTION OF SECURITIES THAT MAY BE OFFERED</A></font></td>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: left"><font style="font: 10pt Times New Roman, Times, Serif">6</font></td></tr>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_008">SELLING SHAREHOLDERS</A></font></td>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: left"><font style="font: 10pt Times New Roman, Times, Serif">11</font></td></tr>
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_009">PLAN OF DISTRIBUTION</A></font></td>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: left"><font style="font: 10pt Times New Roman, Times, Serif">12</font></td></tr>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_010">LEGAL MATTERS</A></font></td>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: left"><font style="font: 10pt Times New Roman, Times, Serif">15</font></td></tr>
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_011">EXPERTS</A></font></td>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: left"><font style="font: 10pt Times New Roman, Times, Serif">15</font></td></tr>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_012">WHERE YOU CAN FIND MORE INFORMATION</A></font></td>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: left"><font style="font: 10pt Times New Roman, Times, Serif">15</font></td></tr>
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_013">INFORMATION INCORPORATED BY REFERENCE</A></font></td>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: left"><font style="font: 10pt Times New Roman, Times, Serif">16</font></td></tr>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_014">DISCLOSURE OF COMMISSION POSITION ON INDEMNIFICATION FOR SECURITIES ACT LIABILITIES</A></font></td>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: left"><font style="font: 10pt Times New Roman, Times, Serif">16</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;&nbsp;</P>


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="ps_1"></A>ABOUT THIS PROSPECTUS SUPPLEMENT</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 27pt">This document is in two parts.&nbsp; The
first part is the prospectus supplement, including the documents incorporated by reference, which describes the specific terms
of this offering.&nbsp; The second part, the accompanying prospectus, including the documents incorporated by reference, provides
more general information. Generally, when we refer to this prospectus, we are referring to both parts of this document combined
together and incorporated by reference.&nbsp; We urge you to carefully read this prospectus supplement and the accompanying prospectus,
and the documents incorporated herein and therein, before buying any of the securities being offered under this prospectus supplement.&nbsp;
This prospectus supplement may add, update or change information contained in the accompanying prospectus.&nbsp; To the extent
that any statement that we make in this prospectus supplement is inconsistent with statements made in the accompanying prospectus
or any documents incorporated by reference therein, the statements made in this prospectus supplement will be deemed to modify
or supersede those made in the accompanying prospectus and such documents incorporated by reference therein.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 27pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 27pt">You should rely only on the information
contained or incorporated herein by reference in this prospectus supplement and contained or incorporated therein by reference
in the accompanying prospectus.&nbsp; We have not authorized anyone to provide you with different or additional information.&nbsp;
If anyone provides you with different, additional or inconsistent information, you should not rely on it.&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 27pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 27pt">We are offering to sell, and are seeking
offers to buy, the shares only in jurisdictions where such offers and sales are permitted. The distribution of this prospectus
supplement and the accompanying prospectus and the offering of the shares in certain jurisdictions or to certain persons within
such jurisdictions may be restricted by law. Persons outside the United States who come into possession of this prospectus supplement
and the accompanying prospectus must inform themselves about and observe any restrictions relating to the offering of the shares
and the distribution of this prospectus supplement and the accompanying prospectus outside the United States. This prospectus
supplement and the accompanying prospectus do not constitute, and may not be used in connection with, an offer to sell, or a solicitation
of an offer to buy, any securities offered by this prospectus supplement and the accompanying prospectus by any person in any
jurisdiction in which it is unlawful for such person to make such an offer or solicitation.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 27pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 27pt">You should assume that the information in
this prospectus supplement and the accompanying prospectus is accurate only as of the date on the front of the applicable document
and that any information we have incorporated by reference is accurate only as of the date of the document incorporated by reference,
regardless of the time of delivery of this prospectus supplement or the accompanying prospectus, or any sale of a security.&nbsp;
Our business, financial condition, results of operations and prospects may have changed since those dates.&nbsp; You should read
this prospectus supplement, the accompanying prospectus and the documents incorporated by reference in this prospectus supplement
and the accompanying prospectus when making your investment decision.&nbsp; You should also read and consider the information
in the documents we have referred you to in the section of the accompanying prospectus entitled &ldquo;Where You Can Find More
Information&rdquo; and &ldquo;Incorporation of Certain Documents by Reference.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 27pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 27pt">This prospectus supplement, the accompanying
prospectus, and the information incorporated herein and therein by reference includes trademarks, service marks and trade names
owned by us or other companies.&nbsp; All trademarks, service marks and trade names included or incorporated by reference into
this prospectus supplement or the accompanying prospectus are the property of their respective owners.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 27pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 27pt">In this prospectus, unless otherwise specified
or the context requires otherwise, we use the terms &ldquo;ClearSign,&rdquo; the &ldquo;Company,&rdquo; &ldquo;we,&rdquo; &ldquo;us&rdquo;
and &ldquo;our&rdquo; to refer to ClearSign Combustion Corporation.&nbsp;</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="ps_2"></A>DISCLOSURE REGARDING FORWARD-LOOKING
STATEMENTS</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">This prospectus supplement, the accompanying
prospectus and the documents incorporated by reference herein and therein contain forward-looking statements within the meaning
of Section 27A of the Securities Act of 1933, as amended (the &ldquo;Securities Act&rdquo;), and Section 21E of the Securities
Exchange Act of 1934, as amended (the &ldquo;Exchange Act&rdquo;). These statements relate to future events or to our future financial
performance and involve known and unknown risks, uncertainties and other factors which may cause our actual results, performance
or achievements to be materially different from any future results, performances or achievements expressed or implied by the forward-looking
statements.</P>

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In some cases, you can identify forward-looking
statements by terminology such as &lsquo;&lsquo;may,&rsquo;&rsquo; &lsquo;&lsquo;will,&rsquo;&rsquo; &lsquo;&lsquo;should,&rsquo;&rsquo;
&lsquo;&lsquo;could,&rsquo;&rsquo; &lsquo;&lsquo;expects,&rsquo;&rsquo; &lsquo;&lsquo;plans,&rsquo;&rsquo; &lsquo;&lsquo;intends,&rsquo;&rsquo;
&lsquo;&lsquo;anticipates,&rsquo;&rsquo; &lsquo;&lsquo;believes,&rsquo;&rsquo; &lsquo;&lsquo;estimates,&rsquo;&rsquo; &lsquo;&lsquo;predicts,&rsquo;&rsquo;
&lsquo;&lsquo;potential,&rsquo;&rsquo; or &lsquo;&lsquo;continue&rsquo;&rsquo; 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; text-indent: 0.5in">&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"><A NAME="ps_3"></A><B>PROSPECTUS SUPPLEMENT
SUMMARY</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 27pt"><I>This summary highlights certain information
about us, this offering and information appearing elsewhere in this prospectus supplement, in the accompanying prospectus and in
the documents we incorporate by reference. This summary is not complete and does not contain all of the information that you should
consider before investing in our securities. To fully understand this offering and its consequences to you, you should read this
entire prospectus supplement and the accompanying prospectus carefully, including the information referred to under the heading
&ldquo;Risk Factors&rdquo; in this prospectus supplement beginning on page S-7, the financial statements and other information
incorporated by reference in this prospectus supplement and the accompanying prospectus when making an investment decision.</I></P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 27pt"><I>&nbsp;</I></P>

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

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

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

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">We design and develop technologies
that aim to improve both the emission control characteristics and operational efficiency<FONT STYLE="font: 10pt Times New Roman, Times, Serif"> </FONT>
of combustion systems. Our core technologies include our Duplex&trade; and Electrodynamic Combustion Control&trade;
(ECC&trade;) technologies. Our Duplex technology uses a porous ceramic tile above a standard burner to significantly reduce
flame length and achieve very low emissions without the need for external flue gas recirculation, selective catalytic
reduction, or excess air systems. Our ECC technology introduces a computer-controlled high voltage electric field into a
combustion volume in order to better control gas-phase chemical reactions and improve system performance and
cost-effectiveness. To date, our operations have been funded primarily through sales of our common stock. We have earned no
significant revenue since inception on January 23, 2008.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">While we have not yet commercialized our
Duplex or ECC technologies and our technologies have not been tested or verified by any independent third party, we believe that
our proprietary technology platforms may improve emissions control performance and operational efficiency for many types of industrial
and commercial combustion systems. As a result, we also believe that our technologies may substantially reduce costs associated
with the construction (including refurbishment and upgrade), operation and maintenance of these combustion systems as compared
to combustion systems that use no or alternative technology to enhance combustion and control emissions through control of the
flame.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Based on the results of our testing, we
believe our technologies compare favorably with current industry-standard air pollution control technologies, such as electrostatic
precipitators, fabric filters, selective catalytic reduction devices, low- and ultra-low NOx burners (which address nitrogen oxides),
excess air systems and other similar technologies. Such systems are used in our current target market segments of petroleum refining
and petrochemical process heaters, package boilers and large-scale once through steam generators (OTSGs).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&nbsp;</P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">The combustion and emissions control markets
are significant, both in the wide array of industries in which the systems are used and in the amount of money spent in installing
and upgrading systems. Nearly two-thirds of the world&rsquo;s total energy consumption is accounted for by the combustion of hydrocarbon
and other fuels in boilers, furnaces, kilns and turbines. These are used to generate electrical power, to provide heat for all
manner of industrial processes and for building heat and produce more than 50 quadrillion British thermal units (BTUs) of energy
annually in the U.S. In order to maximize energy efficiency while keeping pace with regulatory guidelines for air pollution emissions,
operators of these systems are continually installing, maintaining and upgrading a variety of costly process control, air pollution
control and monitoring systems. Although the potential markets for our technologies are vast, our current target market segments
for introduction of our technologies involve petroleum refining and petrochemical process heaters, package boilers and OTSGs.</P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&nbsp;</P>


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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><I>Field Testing of our Duplex Technology</I></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">After performing testing on our Duplex
technology in our laboratory furnace with thermal output up to 5 million BTUs per hour (BTU/hr), we commenced field development
work in the fourth quarter of 2014.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our first field project is with Southern
California-based Aera Energy LLC (Aera Energy) to demonstrate and test the Duplex technology in an OTSG with thermal output capabilities
of up to 40 to 62.5 million BTU/hr used to facilitate the production of heavy oil in California&rsquo;s San Joaquin Valley. Under
the terms of our agreement with Aera Energy, we have retrofitted an OTSG unit to attempt to achieve certain performance criteria
and continue to conduct testing. Our results to date have been favorable in comparison to the customer criteria, but are not yet
completed.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In December 2014, we executed agreements
regarding two further field tests with prospective customers at two separate petroleum refineries in the San Joaquin Valley related
to process heaters with a thermal output ranging from 12 to 15 million BTU/hr. Each agreement has a term of four months, but may
be extended by agreement of the parties. Pursuant to each agreement, if we are able to retrofit the prospective customer&rsquo;s
process heater in accordance with the specifications set forth in the agreement, the prospective customer will purchase a Duplex
system from us. These prospective customers have no other financial obligations under the agreements.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><I>Technical Components of our Duplex and ECC Technologies</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt"><I>&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">Our Duplex burner technology typically consists
of a traditional industrial burner and a porous ceramic tile. When the uncombusted mix of gaseous fuel and air is directed at
the tile, hot gas combusts within the tile itself. Because the fuel and air have more time to mix,<FONT STYLE="color: #2A2A2A">
the NOx- forming hot spots that are typically produced in an open flame are eliminated and a dramatically shorter flame is produced.
</FONT>NOx, a regulated pollutant comprised largely of nitrogen oxide and nitrogen dioxide, <FONT STYLE="color: #2A2A2A">is greatly
reduced without any external fans or associated power, thereby minimizing harmful emissions while improving system efficiency.
</FONT>A shorter flame allows for improved heat transfer and operation of the furnace at a higher capacity since it reduces the
possibility of flame impingement and coking in a combustion chamber.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">Our ECC technology consists, in its simplest
form, of four major components: (a) a computer, (b) standard software delivering proprietary algorithms to (c) a power amplifier
(resident outside the combustion chamber) and (d) electrodes inside the combustion chamber. ECC introduces a high voltage electric
field into the combustion process to control the resulting flames electrically through the naturally forming ions. The electrodes
are optimized in material and shape to best suit the specific geometry of a given installation. We have also demonstrated a technique
to apply ECC to a combustion system without requiring an electrode to have physical contact with the flame. ECC appears ideally
applied to solid fuel combustion.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">Because the basic components of both systems
are either available &lsquo;off the shelf&rsquo; or require manufacturing techniques that are well within the current state of
the art, we do not depend on unavailable external technology.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">We believe our technologies can be retrofitted
to existing combustion systems to improve their performance and have the potential to provide substantial savings in both capital
and operating costs, or, for new-builds, can serve as the basis for fundamental improvements in the design, cost and operation
of combustion systems.</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><I>Research and Development Plan </I></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have tested aspects of our Duplex and
ECC technologies&nbsp;in our laboratory on our 1 million and 5 million BTU/hr research furnaces, our 1 million BTU/hr boiler simulator,
and our 1 million BTU/hr solid fuel furnace. We have installed our Duplex technology in field test sites with thermal output up
to 55 million BTU/hr on an OTSG and continue such testing. We continue to conduct solid fuel laboratory testing utilizing our
ECC technology in conjunction with six parties who have collectively contributed $110,000 in 2014 to our research. Our technologies
have not been tested or verified by any independent third party. Our research and development efforts are now focused on the following
sequence of activities:</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif"><I>Scale
                                         up to commercially relevant sizes. </I>With regard to our ECC technology, we have finalized
                                         designs and built furnaces and burners at what we believe to be a commercially relevant
                                         scale. We have identified key potential development partners and customers with whom
                                         we are engaged in discussions to apply our ECC technology to their particular uses at
                                         commercially relevant scales, which can be 1 million BTUs or greater. Our laboratory
                                         testing is ongoing in conjunction with the six parties that are offering their field
                                         know-how.</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif"><I>Site
                                         demonstration at full scale. </I>We have begun to demonstrate our Duplex technology at
                                         a commercial site with an OTSG firing at up to 55 million BTU/hr and have reached agreements
                                         for two further field site deployments associated with petroleum refinery process heaters.
                                         These process heater applications involve the retrofit of a single-burner, 15 million
                                         BTU/hr vertical cylindrical heater and a three burner, 12 million BTU/hr process heater.
                                         These early site demonstrations are aimed at retrofitting existing burners in single
                                         or multi-burner systems in order to evaluate our Duplex technology at full scale in several
                                         operating systems.</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif"><I>First
                                         installation. </I>After initial completion of site demonstrations in various applications
                                         of our Duplex technology, we anticipate that these demonstrations will transition to
                                         validation and documentary phases with extended operation periods in the field. This
                                         would include validation from prospective customer users and environmental regulatory
                                         bodies. We believe that such a demonstration would provide the impetus for commercial
                                         adoption within the applicable industry.</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif"><I>Enhancement
                                         of our intellectual property portfolio. </I>We have generated inventions that we believe
                                         to be patentable subject matter and for which we have been seeking protection through
                                         patent application filings. As of December 31, 2014, we have filed 154 patent applications
                                         with the U.S. Patent and Trademark Office (USPTO) and certain foreign regulatory bodies
                                         related to our Duplex and ECC technologies, which remain pending. We have been granted
                                         3 patents by the USPTO related to our ECC technology. We cannot predict when our patent
                                         applications may result in issued patents, if at all. Further, we may modify a patent
                                         application in the future as we develop additional information. As a result, we may create
                                         additional patent applications from an existing application, consolidate existing patent
                                         applications, abandon applications, or otherwise modify applications based upon our judgment
                                         in order to protect our intellectual property in a reasonably cost beneficial manner.</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"><B>The Combustion Markets</B></P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">We are seeking to enter the combustion and
emissions control markets and to establish ourselves in highly competitive industries against companies that have both substantially
greater financial resources than we do and established products. However, we believe that our technologies could offer a unique
and powerful ability to improve energy efficiency and enhance operation while reducing many pollutants at the source. We intend
to target the following segments of the combustion market:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 45pt"></TD><TD STYLE="width: 18pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">process
                                         heaters for petroleum refining and petrochemical processing,</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 45pt"></TD><TD STYLE="width: 18pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">heating
                                         systems in package boilers, and</FONT></TD></TR></TABLE>

<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;&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 45pt"></TD><TD STYLE="width: 18pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">larger-scale
                                         steam generation systems.</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">In each segment, we plan to market solutions
with our Duplex technology that we believe could simultaneously improve both pollution control and operational efficiency characteristics
through (a) cost-effective retrofitting of our Duplex technology onto existing standard system designs, and (b) new system designs.</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We believe that our technologies have the
potential to transform industries that rely upon combustion, and are broadly applicable in large, scalable, global markets.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In addition to our existing agreements
with three prospective customers for whom we are field testing our Duplex technology, we intend to form research and development
partnerships to further develop our technologies within targeted market segments.&nbsp;&nbsp;Among the types of potential partners
we will seek to establish relationships with both in the U.S. and globally, will be:&nbsp;</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">end
                                         users of original equipment manufacturers (OEMs) products and services interested in
                                         advancing the development of our technologies in order to address their operational needs;</FONT></TD></TR></TABLE>

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

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

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">industry
                                         research groups, whose mission is the development and testing of new technologies for
                                         the eventual benefit of their member companies; and</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">government
                                         entities such as the U.S. Department of Energy, who are chartered with the development
                                         of longer-range and potentially disruptive energy technologies.</FONT></TD></TR></TABLE>

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

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Implications of Being an Emerging
Growth Company</P>

<P STYLE="font: bold 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-indent: 0.5in">We are an &ldquo;emerging growth company&rdquo;
as defined in the JOBS Act. As an emerging growth company, we can take advantage of specified reduced disclosure and other requirements
that are otherwise applicable generally to public companies. These provisions include:</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>a requirement
                                         to provide only two years of audited financial statements in addition to any required
                                         unaudited interim financial statements with correspondingly reduced &ldquo;Management&rsquo;s
                                         Discussion and Analysis of Financial Condition and Results of Operations&rdquo; disclosure;</TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>reduced disclosure
                                         about our executive compensation arrangements;</TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>no non-binding
                                         advisory votes on executive compensation or golden parachute arrangements; and</TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>exemption from
                                         the auditor attestation requirement in the assessment of our internal control over financial
                                         reporting.</TD></TR></TABLE>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have elected to use the extended transition
period for complying with new or revised accounting standards under Section 102(b)(1) of the JOBS Act. This election allows us
to delay the adoption of new or revised accounting standards that have different effective dates for public and private companies
until those standards apply to private companies. As a result of this election, our financial statements may not be comparable
to companies that comply with public company effective dates.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 15pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We may take advantage of these provisions
for up to five years from the date of our initial public offering which we consummated in 2012 or such earlier time that we are
no longer an emerging growth company. We would cease to be an emerging growth company on the date that is the earliest of (i)
the last day of the fiscal year in which we have total annual gross revenues of $1 billion or more; (ii) the last day of our fiscal
year ending December 31, 2017; (iii) the date on which we have issued more than $1 billion in nonconvertible debt during the previous
three years; or (iv) the date on which we are deemed to be a &ldquo;large accelerated filer&rdquo; under the rules of the Securities
and Exchange Commission.</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;&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">To the extent that we continue to qualify
as a &ldquo;smaller reporting company,&rdquo; as such term is defined in Rule 12b-2 under the Securities Exchange Act of 1934,
as amended, after we cease to qualify as an emerging growth company, certain of the exemptions available to us as an emerging
growth company may continue to be available to us as a smaller reporting company, including: (1) not being required to comply
with the auditor attestation requirements of Section 404(b) of the Sarbanes Oxley Act; (2) scaled executive compensation disclosures;
and (3) the requirement to provide only two years of audited financial statements, instead of three years.</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We were incorporated in Washington on January
23, 2008 under the name &ldquo;ClearSign Combustion Corporation.&rdquo; Our facilities and executive offices are located at 12870
Interurban Avenue South, Seattle, Washington 98168, and our telephone number is (206) 673-4848. Additional information about us
is available on our website at www.clearsign.com. The information contained on or that may be obtained from our website is not,
and shall not be deemed to be, a part of this prospectus supplement and the accompanying prospectus. Our common stock, par value
$0.0001 per share, is currently traded on The NASDAQ Capital Market under the ticker symbol &ldquo;CLIR.&rdquo;</P>

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

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

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

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR>
    <TD STYLE="vertical-align: top; width: 43%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Common stock offered by us pursuant to this prospectus supplement</FONT></TD>
    <TD STYLE="vertical-align: bottom; width: 2%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 55%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">2,600,000&nbsp;shares</FONT></TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Common stock to be outstanding immediately after the offering</FONT></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">12,281,476&nbsp;shares</FONT></TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Price per share</FONT></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">$5.85</FONT></TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Over-allotment option</FONT></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">We have granted the underwriter an option to purchase from us within 45 days of the date of this prospectus supplement up to an additional 390,000 shares of common stock to cover over-allotments, if any.</FONT></TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Use of proceeds</FONT></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">We currently intend to use the net proceeds from this offering as follows: approximately $6 million for research and development, including capital expenditures, $3 million for protection of intellectual property, $2 million for business development and marketing, and the balance for working capital and general corporate purposes. For a more complete discussion of the ways in which the proceeds from this offering may be used, see the section of this prospectus supplement titled &ldquo;Use of Proceeds&rdquo; at page&nbsp;S-9.</FONT></TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">NASDAQ Capital Market symbol</FONT></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">CLIR</FONT></TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Risk factors</FONT></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Investing in our common stock involves a high degree of risk. See &ldquo;Risk Factors&rdquo; beginning on page&nbsp;S-7 of this prospectus supplement and page 6 of the accompanying base prospectus.</FONT></TD></TR>
<TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD></TR>
<TR>
    <TD STYLE="vertical-align: top"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Participation of officers and directors</FONT></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Certain of our officers and directors intend to participate in this offering.&nbsp;&nbsp;For further information relating to their participation, please see the section of this prospectus supplement titled &ldquo;Underwriting&rdquo; at page S-12.</FONT></TD></TR>
</TABLE>


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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The number of shares of common stock to
be outstanding immediately after this offering as shown above is based on 9,681,476 shares of common stock outstanding as of December
31, 2014.&nbsp; The number of outstanding shares excludes, as of December 31, 2014:</P>



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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">643,817
                                         shares of common stock reserved for issuance upon the exercise of outstanding stock options
                                         granted pursuant to various employee and consultant incentive plans, including our 2011
                                         Equity Incentive Plan, at exercise prices ranging from $2.20 to $9.90;</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 2.25pt">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">564,272
                                         shares of common stock reserved for issuance pursuant to our warrant purchase agreements
                                         at exercise prices ranging from $1.80 to $10.00, which have not yet been issued;</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">243,305
                                         shares of our common stock reserved for future issuance under our 2011 Equity Incentive
                                         Plan; </FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">65,662
                                         shares of our common stock reserved for future issuance under our 2013 Consultant Stock
                                         Plan; and</FONT></TD></TR></TABLE>

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

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">390,000 shares of our common stock in respect of the underwriter&rsquo;s
over-allotment option.</FONT></TD></TR></TABLE>



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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="ps_4"></A>RISK FACTORS</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Investing in our common stock involves
a high degree of risk. Please see the risk factors set forth in Part I, Item 1A of our Annual Report on Form 10-K for the year
ended December 31, 2013, which are incorporated by reference in this prospectus, and those additional risk factors set forth below.
Before making an investment decision, you should carefully consider these risks as well as other information we include or incorporate
by reference in this prospectus. The risks and uncertainties we have described are not the only ones we face. Additional risks
and uncertainties not presently known to us may also affect our business operations. These risks could materially affect our business,
results of operations or financial condition and cause the value of our securities to decline.</I></P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>The loss of the services of our key management and personnel
or the failure to attract additional key personnel could adversely affect our ability to operate our business. </I></B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">A loss of one or more of our current officers
or key employees could severely and negatively impact our operations. Of particular note, the loss of services of Stephen Pirnat,
Chief Executive Officer and President, or Joseph Colannino, Chief Technology Officer, could significantly harm our business. We
have no present intention of obtaining key-man life insurance on any of our executive officers or management. Additionally, competition
for highly skilled technical, managerial and other personnel is intense. As our business develops, we might not be able to attract,
hire, train, retain and motivate the highly skilled managers and employees we need to be successful. If we fail to attract and
retain the necessary technical and managerial personnel, our business will suffer and might fail.&nbsp;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; background-color: white"><B>Risks Related
to This Offering</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>We may allocate the net proceeds from this offering in
ways which differ from our estimates based on our current plans and assumptions discussed in the section titled &quot;Use of Proceeds&quot;
and with which you may not agree.</I></B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The allocation of net proceeds of the offering
set forth in the &ldquo;Use of Proceeds&rdquo; section below represents our estimates based upon our current plans and assumptions
regarding industry and general economic conditions, our future revenues and expenditures. The amounts and timing of our actual
expenditures will depend on numerous factors, including market conditions, cash generated by our operations, business developments
and related rate of growth. We may find it necessary or advisable to use portions of the proceeds from this offering for other
purposes. Circumstances that may give rise to a change in the use of proceeds and the alternate purposes for which the proceeds
may be used are discussed in the section entitled &ldquo;Use of Proceeds&rdquo; below. You may not have an opportunity to evaluate
the economic, financial or other information on which we base our decisions on how to use our proceeds. As a result, you and other
shareholders may not agree with our decisions. See &quot;Use of Proceeds&quot; for additional information.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white"><B><I>You will experience immediate
and substantial dilution in the net tangible book value per share of the common stock you purchase.</I></B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Since the price
per share of our common stock being offered is substantially higher than the net tangible book value per share of our common stock,
you will suffer immediate dilution in the net tangible book value of the common stock you purchase in this offering. After giving
effect to the sale of 2,600,000 shares of our common stock in this offering at the offering price of $5.85 per share, and after
deducting the underwriting commissions and estimated offering expenses payable by us, you will experience immediate dilution of
$4.46 per share, representing the difference between our as adjusted net tangible book value per share as of September 30, 2014
after giving effect to this offering and the offering price. See the section entitled &ldquo;Dilution&rdquo; for a more detailed
discussion of the dilution you will incur if you purchase common stock in this offering.</P>



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


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<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; background-color: white"><B><I>You may experience future dilution
as a result of future equity offerings.</I></B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">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. We cannot assure you that we will be able to sell shares or other securities in any other offering at a
price per share that is equal to or greater than the price per share paid by investors in this offering, and investors purchasing
shares or other securities in the future could have rights superior to existing stockholders. The price per share at which we
sell additional shares of our common stock or other securities convertible into or exchangeable for our common stock in future
transactions may be higher or lower than the price per share in this offering.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>Sales of additional shares of our common stock, including
by us or our directors and officers following expiration or early release of the three month lock-up, could cause the price of
our common stock 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-indent: 0.5in">Sales of substantial amounts of our common
stock in the public market, or the availability of such shares for sale, by us or others, including the issuance of common stock
upon exercise of outstanding options, could adversely affect the price of our common stock. In connection with this offering and
with certain exceptions, we and our directors and officers have entered into lock-up agreements for a period of six months following
this offering (which period may be extended under certain circumstances). Under the terms of the lock-up agreement, we and our
directors and officers may be released from lock-up prior to the expiration of the lock-up period at the sole discretion of MDB
Capital Group, LLC. See &ldquo;Plan of Distribution&rdquo;. Upon expiration or earlier release of the lock-up, we and our directors
and officers may sell shares into the market, which could adversely affect the market price of shares of our common stock.</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;&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="ps_5"></A>PRICE RANGE OF OUR COMMON STOCK</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our common stock is traded under the symbol
CLIR on the NASDAQ Capital Market. Trading of our common stock on the NASDAQ Capital Market began on April 25, 2012. The table
below presents the range of high and low sales prices of our common stock since January 1, 2013.</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER" STYLE="border-collapse: collapse; width: 90%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt; padding-bottom: 1pt">&nbsp;</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">High</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt">&nbsp;</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">Low</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt">&nbsp;</TD></TR>

<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt; padding-bottom: 1pt">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; border-bottom: Black 1pt solid">2015</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt">&nbsp;</TD></TR>

<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 74%; font: 10pt Times New Roman, Times, Serif">First quarter through February 4, 2015</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">$</TD><TD STYLE="width: 10%; font: 10pt Times New Roman, Times, Serif; text-align: right">7.24</TD><TD STYLE="width: 1%; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="width: 1%; font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="width: 1%; font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="width: 10%; font: 10pt Times New Roman, Times, Serif; text-align: right">5.78</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: White">
    <TD STYLE="font-size: 10pt; padding-bottom: 1pt">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; border-bottom: Black 1pt solid">2014</TD><TD STYLE="text-align: left; padding-bottom: 1pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">Fourth quarter ended December 31, 2014</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">8.13</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">5.27</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="font: 10pt Times New Roman, Times, Serif">Third quarter ended September 30, 2014</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">9.11</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">6.11</TD><TD STYLE="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">Second quarter ended June 30, 2014</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">10.90</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">7.65</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="font: 10pt Times New Roman, Times, Serif">First quarter ended March 31, 2014</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">11.75</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">8.77</TD><TD STYLE="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-size: 10pt; padding-bottom: 1pt">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; border-bottom: Black 1pt solid">2013</TD><TD STYLE="text-align: left; padding-bottom: 1pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif">Fourth quarter ended December 31, 2013</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">11.45</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">5.92</TD><TD STYLE="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">Third quarter ended September 30, 2013</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">9.67</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">6.95</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="font: 10pt Times New Roman, Times, Serif">Second quarter ended June 30, 2013</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">10.78</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">6.80</TD><TD STYLE="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">First quarter ended March 31, 2013</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">7.13</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">4.29</TD><TD STYLE="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; text-indent: 0.5in"></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 48.95pt"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The last reported sale price of our common
stock on the NASDAQ Capital Market on February 4, 2015 was $6.11 per share.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 48.95pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>Holders </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">As of February 4, 2015, there were
approximately 252 holders of record of our common stock. Additionally, shares of common stock are held by financial institutions
as nominees for beneficial owners that are deposited into participant accounts at DTC, which are considered to be held of record
by Cede&nbsp;&amp; Co. and are included in the holders of record as one stockholder. Our stock transfer agent is VStock Transfer,
LLC, 18 Lafayette Place, Woodmere, New York 11598 and their phone number is (212) 828-8436.</P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 48.95pt"><B>&nbsp;</B></P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have not paid any cash dividends on
our common stock since our inception and do not anticipate paying any cash dividends in the foreseeable future. We plan to retain
our earnings, if any, to provide funds for the expansion of our 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: center"><A NAME="ps_6"></A><B>USE OF PROCEEDS</B></P>

<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-indent: 0.5in">We estimate that the net proceeds from the
sale of the shares of common stock that we are offering hereby will be approximately $14.2 million, after deducting the estimated
underwriting commissions and estimated offering expenses payable by us (approximately $16.3 million if the over-allotment option
granted to the underwriter is exercised in full). We do not expect that a change in the offering price or the number of shares
by these amounts would have a material effect on our use of the proceeds from this offering, although it may impact the amount
of time prior to which we will need to seek additional capital.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We currently intend to use the net proceeds from this offering as follows: approximately $6 million for
<FONT STYLE="font: 10pt Times New Roman, Times, Serif">research and development including capital expenditures, $3 million for
protection of intellectual property, $2 million for business development and marketing, and the balance for working capital and
general corporate </FONT></P>



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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The amounts and timing of our actual expenditures
will depend on numerous factors, including market conditions, results from our research and development efforts, business developments
and opportunities and related rate of growth, sales and marketing activities and competition. Accordingly, our management will
have broad discretion in the application of the net proceeds from this offering, and investors will be relying on the judgment
of our management with regard to the use of these net proceeds. We may find it necessary or advisable to use portions of the proceeds
from this offering for other purposes. Circumstances that may give rise to a change in the use of proceeds and the alternate purposes
for which the proceeds may be used include:&nbsp;</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">the
                                         existence of unforeseen or other opportunities or the need to take advantage of changes
                                         in timing of our existing activities;</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">the
                                         need or desire on our part to accelerate, increase, reduce or eliminate one or more existing
                                         initiatives due to, among other things, changing market conditions and competitive developments
                                         or interim results of research and development efforts;</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">results
                                         from our business development and marketing efforts, including co-development and pilot
                                         site installation opportunities that may materialize;</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">the
                                         effect of federal, state, and local regulation, including those governing emissions,
                                         of potential customers in our identified industries;</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">our
                                         ability to attract development funding or to license or sell our technologies to industry
                                         sponsors or other interested organizations; and/or</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">strategic
                                         opportunities of which we are not currently aware present themselves (including acquisitions,
                                         joint ventures, licensing and other similar transactions).</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">From time to time, we evaluate these and
other factors and we anticipate continuing to make such evaluations to determine if the existing allocation of resources, including
the proceeds of this offering, is being optimized.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Pending the use of the net proceeds from
this offering as described above, we intend to invest in investment-grade, interest-bearing instruments.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><A NAME="ps_7"></A><B>CAPITALIZATION</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following table sets forth our capitalization
as of September 30, 2014 on an actual basis and on an as-adjusted basis after giving effect to the completion of this offering
with a sale by us of 2,600,000 shares of common stock and net proceeds of approximately $14.2 million (2,990,000 shares of common
stock and net proceeds of approximately $16.3 million if the over-allotment option granted to the underwriter is exercised in full).</P>



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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">This table should be read in conjunction
with our audited and unaudited financial statements.</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;&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 NOWRAP>&nbsp;</TD><TD NOWRAP STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="6" NOWRAP STYLE="text-align: center; border-bottom: Black 1pt solid">September 30, 2014</TD><TD NOWRAP STYLE="padding-bottom: 1pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP>&nbsp;</TD><TD NOWRAP STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="text-align: center; border-bottom: Black 1pt solid">As reported</TD><TD NOWRAP STYLE="padding-bottom: 1pt">&nbsp;</TD><TD NOWRAP STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="text-align: center; border-bottom: Black 1pt solid">As adjusted</TD><TD NOWRAP STYLE="padding-bottom: 1pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP>&nbsp;</TD><TD NOWRAP>&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="text-align: center">(unaudited)</TD><TD NOWRAP>&nbsp;</TD><TD NOWRAP>&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="text-align: center">(unaudited)</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center">&nbsp;</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 74%; text-align: left; padding-bottom: 1pt">Cash and cash equivilents</TD><TD STYLE="width: 1%; padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="width: 1%; border-bottom: Black 1pt solid; text-align: left">$</TD><TD STYLE="width: 10%; border-bottom: Black 1pt solid; text-align: right">3,277,000</TD><TD STYLE="width: 1%; padding-bottom: 1pt; text-align: left">&nbsp;</TD><TD STYLE="width: 1%; padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="width: 1%; border-bottom: Black 1pt solid; text-align: left">$</TD><TD STYLE="width: 10%; border-bottom: Black 1pt solid; text-align: right">17,439,000</TD><TD STYLE="width: 1%; padding-bottom: 1pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Stockholders' Equity:</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Common stock, $0.0001 par value, 62,500,000 shares authorized, 9,667,731 shares issued and
    outstanding,     actual; 12,267,731 shares issued and outstanding, as adjusted</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">1,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">1,000</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Additional paid-in capital</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">24,003,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">38,165,000</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-bottom: 1pt"><P STYLE="margin: 0pt 0">Accumulated deficit</P>


</TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; text-align: right">(18,958,000</TD><TD STYLE="padding-bottom: 1pt; text-align: left">)</TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; text-align: right">(18,958,000</TD><TD STYLE="padding-bottom: 1pt; text-align: left">)</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 1pt">Total stockholders' equity</TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left">$</TD><TD STYLE="border-bottom: Black 1pt solid; text-align: right">5,046,000</TD><TD STYLE="padding-bottom: 1pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left">$</TD><TD STYLE="border-bottom: Black 1pt solid; text-align: right">19,208,000</TD><TD STYLE="padding-bottom: 1pt; text-align: left">&nbsp;</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><A NAME="ps_8"></A>DILUTION</B></P>

<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-indent: 0.5in">Our net tangible book value as of September
30, 2014 was approximately $2,774,000, or $0.29 per share of our common stock. Our net tangible book value per share represents
our total tangible assets less total liabilities divided by the number of shares of our common stock outstanding on September 30,
2014. Assuming that we issue all of the shares of our common stock offered by us at the offering price of $5.85 per share, and
after deducting the underwriting commissions and estimated offering expenses payable by us, our net tangible book value as of September
30, 2014 would have been approximately $17.0 million, or $1.39 per share of our common stock. This amount represents an immediate
increase in net tangible book value of $1.10 per share to our existing shareholders and an immediate dilution in net tangible book
value of $4.46 per share to new investors purchasing shares of our common stock in this offering.</P>



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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We determine dilution by subtracting the
adjusted net tangible book value per share after this offering from the offering price per share of our common stock. The following
table illustrates the dilution in net tangible book value per share to new investors:&nbsp;</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 74%">Public offering price per share</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; text-align: right"></TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 10%; text-align: right">5.85</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>Net tangible book value per share as of September 30, 2014</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">0.29</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 1pt">Increase per share attributable to new investors</TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left">$</TD><TD STYLE="border-bottom: Black 1pt solid; text-align: right">1.10</TD><TD STYLE="padding-bottom: 1pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1pt; text-align: right">&nbsp;</TD><TD STYLE="padding-bottom: 1pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-bottom: 1pt">Adjusted net book value per share after this offering</TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1pt; text-align: right">&nbsp;</TD><TD STYLE="padding-bottom: 1pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left">$</TD><TD STYLE="border-bottom: Black 1pt solid; text-align: right">1.39</TD><TD STYLE="padding-bottom: 1pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 2.5pt">Dilution in net tangible book value per share to new investors</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt; text-align: right">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">4.46</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left"></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-indent: 0.5in">The following shares were not included in
the above calculation as of September 30, 2014:</P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;&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: 24px">&nbsp;</TD>
    <TD STYLE="width: 24px"><FONT STYLE="font: 10pt Symbol">&middot;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">676,843 shares of our common stock issuable upon exercise of stock
    options under our 2011 Equity Incentive Plan at a weighted average exercise price of $4.46 per share; </FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: -0.25in">&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: 24px">&nbsp;</TD>
    <TD STYLE="width: 24px"><FONT STYLE="font: 10pt Symbol">&middot;</FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">564,272 shares of our common stock reserved for issuance under
    various outstanding warrant agreements at a weighted exercise price of $4.14 per share;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: -0.25in">&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: 24px">&nbsp;</TD>
    <TD STYLE="width: 24px"><FONT STYLE="font: 10pt Symbol">&middot;</FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">207,779 shares of our common stock reserved for future issuance
    under our 2011 Equity Incentive Plan; and</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;&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: 24px">&nbsp;</TD>
    <TD STYLE="width: 24px"><FONT STYLE="font: 10pt Symbol">&middot;</FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">65,412 shares of our common stock reserved for future issuance
    under our 2013 Consultant Stock Plan.</FONT></TD></TR>
</TABLE>
<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;&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Unless otherwise specifically stated, information
throughout this prospectus supplement assumes that none of our outstanding options and warrants to purchase shares of our common
stock are exercised. <FONT STYLE="background-color: white">To the extent that the above issued options and warrants were exercised,
the pro forma net tangible book value per share of our common stock after giving effect to this offering would be $1.34 per share,
and the dilution in net tangible book value per share to investors in this offering would be $4.51 per share.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In conjunction with this offering, we have
agreed not to undertake an offering of our securities for a period of 12 months following the date of this prospectus supplement
without the written consent of MDB Capital Group, LLC. However, after expiration of that period, 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.&nbsp; 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; text-indent: 27pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B><A NAME="ps_9"></A>UNDERWRITING</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We are offering the shares of common stock
described in this prospectus supplement through the underwriter, MDB Capital Group, LLC.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have agreed to enter into an underwriting
agreement with the underwriter prior to the closing of this offering. Subject to the terms and conditions of the underwriting
agreement, we will agree to sell to the underwriter, and the underwriter will agree to purchase, at the public offering price
less the underwriting discounts and commissions set forth on the cover page of this prospectus supplement, shares of our common
stock.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The underwriter is committed to purchase
all the shares of common stock offered by us, other than those covered by the option to purchase additional shares described below,
if they purchase any shares. The underwriting agreement provides that the underwriter&rsquo;s obligations to purchase shares of
our common stock are subject to conditions contained in the underwriting agreement. A copy of the underwriting agreement has been
filed as an exhibit to the Current Report on Form 8-K that we filed on February 5, 2015 and is incorporated by reference to the
registration statement of which this prospectus is a part.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have been advised by the underwriter
that the underwriter proposes to offer shares of our common stock directly to the public at the public offering price set forth
on the cover page of this prospectus supplement and to certain dealers that are members of the Financial Industry Regulatory Authority
(FINRA). Any securities sold by the underwriter to such securities dealers will be sold at the public offering price less a selling
concession not in excess of $0.351 per share. After the public offering of the shares, the offering price and other selling terms
may be changed by the underwriter.</P>



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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">None of our securities included in this
offering may be offered or sold, directly or indirectly, nor may this prospectus supplement and any other offering material or
advertisements in connection with the offer and sales of any of our common stock be distributed or published in any jurisdiction,
except under circumstances that will result in compliance with the applicable rules and regulations of that jurisdiction. Persons
who receive this prospectus supplement are advised to inform themselves about and to observe any restrictions relating to this
offering of our common stock and the distribution of this prospectus supplement. This prospectus supplement is neither an offer
to sell nor a solicitation of any offer to buy any of our common stock included in this offering in any jurisdiction where that
would not be permitted or legal.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The underwriter has advised us that it
does not intend to confirm sales to any accounts over which they exercise discretionary authority.</P>

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


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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following table summarizes the underwriting
discount and commission to be paid to the underwriter by us.</P>

<P STYLE="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>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">&nbsp;</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; border-bottom: Black 1pt solid; text-align: center">Without <BR>Over- <BR>Allotment</TD><TD STYLE="padding-bottom: 1pt; font: 10pt Times New Roman, Times, Serif">&nbsp;</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; border-bottom: Black 1pt solid; text-align: center">With <BR>Over- <BR>Allotment</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="width: 74%; font: 10pt Times New Roman, Times, Serif">Public offering price</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">$</TD><TD STYLE="width: 10%; font: 10pt Times New Roman, Times, Serif; text-align: right">15,210,000</TD><TD STYLE="width: 1%; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="width: 1%; font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="width: 1%; font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="width: 10%; font: 10pt Times New Roman, Times, Serif; text-align: right">17,491,500</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: White">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">Underwriting discount to be paid to the underwriter</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">912,600</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">1,049,490</TD><TD STYLE="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">Non-accountable expense allowance</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">55,000</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">55,000</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="font: 10pt Times New Roman, Times, Serif; text-align: left">Net proceeds, before other expenses</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">14,242,400</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">16,387,010</TD><TD STYLE="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"></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We estimate the total expenses payable by us for this offering
to be $1,047,600, which amount includes (i) the underwriting discount of $912,600 ($1,049,490 if the underwriter&rsquo;s over-allotment
option is exercised in full), (ii) a non-accountable expense allowance of $55,000, and (iii) other estimated expenses of the Company
of approximately $80,000, which includes legal, accounting, printing costs and various fees associated with the registration and
listing of our shares.</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have granted to the underwriter an option,
exercisable not later than 45 days after the date of this prospectus, to purchase up to an additional 390,000 shares of our common
stock (up to 15% of the shares firmly committed in this offering) at the public offering price, less the underwriting discount,
set forth on the cover page of this prospectus supplement. The underwriter may exercise the option solely to cover over-allotments,
if any, made in connection with this offering. If any additional shares of our common stock are purchased pursuant to the over-allotment
option, the underwriter will offer these additional shares of our common stock on the same terms as those on which the other shares
of common stock are being offered hereby.</P>

<P STYLE="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>Purchase by a Director</B></P>



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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The underwriter has agreed with the Company
to sell an aggregate of $500,000 in value of the shares of common stock sold in this offering to Dr. Lon E. Bell, Ph.D., a director,
at the public offering price set forth on the cover page of this prospectus supplement.</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Certain of our officers and directors have
agreed that, for a period of six months from the date of this prospectus supplement, they will not sell, contract to sell, grant
any option for the sale or otherwise dispose of any of our equity securities, or any securities convertible into or exercisable
or exchangeable for our equity securities, without the consent of MDB Capital Group, LLC, except for exercise or conversion of
currently outstanding warrants, options and convertible debentures, as applicable; and exercise of options under an acceptable
stock incentive plan. This lock-up covers 277,231 shares of our common stock and 244,818 shares of common stock issuable upon exercise
of warrants held by the underwriter. The underwriter has agreed that for a six month period after the date of this prospectus supplement
it will not sell, contract to sell, grant any option for the sale or otherwise dispose of an aggregate of 522,049 shares of our
common stock issued or issuable to the underwriter, including 244,818 shares subject to outstanding warrants held by the underwriter,
which may only be sold with the consent of the Company.</P>



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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We will agree to indemnify the underwriter
against certain liabilities, including certain liabilities arising under the Securities Act, and to contribute to payments that
the underwriter may be required to make for these liabilities.</P>

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


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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The underwriter may engage in over-allotment,
syndicate covering transactions, and penalty bids or purchases for the purpose of pegging, fixing or maintaining the price of
the common stock, in accordance with Regulation M under the Exchange Act.</P>

<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%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 24px">&nbsp;</TD>
    <TD STYLE="width: 24px"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&bull;</FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Over-allotment involves sales by the underwriter of shares in excess
    of the number of shares the underwriter is obligated to purchase, which creates a syndicate short position. The short position
    may be either a covered short position or a naked short position. In a covered short position, the number of shares over-allotted
    by an underwriter is not greater than the number of shares that it may purchase in the over-allotment option. In a naked short
    position, the number of shares involved is greater than the number of shares in the over-allotment option. The underwriter
    may close out any short position by either exercising its over-allotment option and/or purchasing shares in the open market.</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%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 24px">&nbsp;</TD>
    <TD STYLE="width: 24px"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&bull;</FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Syndicate covering transactions involve purchases of the common
    stock in the open market after the distribution has been completed in order to cover syndicate short positions. In determining
    the source of shares to close out the short position, the underwriter will consider, among other things, the price of shares
    available for purchase in the open market as compared to the price at which it may purchase shares through the over-allotment
    option. If an underwriter sells more shares than could be covered by the over-allotment option, a naked short position, the
    position can only be closed out by buying shares in the open market. A naked short position is more likely to be created if
    an underwriter is concerned that there could be downward pressure on the price of the shares in the open market after pricing
    that could adversely affect investors who purchase in the offering.</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%">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 24px">&nbsp;</TD>
    <TD STYLE="width: 24px"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">&bull;</FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Penalty bids permit an underwriter to reclaim a selling concession
    from a syndicate member when the shares originally sold by the syndicate member are purchased in a stabilizing or syndicate
    covering transaction to cover syndicate short positions.</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">These syndicate covering transactions and
penalty bids may have the effect of raising or maintaining the market price of our common stock or preventing or retarding a decline
in the market price of the common stock. As a result, the price of the common stock may be higher than the price that might otherwise
exist in the open market. These transactions may be effected on the NASDAQ Capital Market, and if commenced, they may be discontinued
at any time.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Neither we nor the underwriter make any
representation or prediction as to the direction or magnitude of any effect that the transactions described above may have on
the price of the common stock. In addition, neither we nor the underwriter make any representation that the underwriter will engage
in these transactions or that any transaction, once commenced, will not be discontinued without notice.</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">A prospectus in electronic format may be
made available on the Internet sites or through other online services maintained by the underwriter, or by its affiliates. In
those cases, prospective investors may view offering terms online and, depending upon the underwriter, prospective investors may
be allowed to place orders online. The underwriter may agree with us to allocate a specific number of shares for sale to online
brokerage account holders. Any such allocation for online distributions will be made by the underwriter on the same basis as other
allocations.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Other than the prospectus in electronic
format, the information on the underwriter&rsquo;s website and any information contained in any other website maintained by the
underwriter is not part of the prospectus or the registration statement of which this prospectus forms a part, has not been approved
and/or endorsed by us or the underwriter in its capacity as underwriter and should not be relied upon by investors.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The compensation to be paid to the underwriter
in connection with this offering is limited to the fees and expenses described above under &ldquo;Underwriting discount and expenses.&rdquo;</P>

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


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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><A NAME="ps_10"></A><B>LEGAL MATTERS</B></P>

<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-indent: 0.5in">Richardson &amp; Patel, LLP, with an office
at 1100 Glendon Avenue, Suite 800, Los Angeles, California 90024, will pass upon the validity of the securities offered in this
prospectus supplement. As of the date of this prospectus supplement, the principals of Richardson &amp; Patel, LLP or entities
controlled by its principals own 10,000 shares of our common stock. Although Richardson &amp; Patel, LLP is not under any obligation
to accept shares of our common stock in payment for services, it has done so in the past and may do so in the future. Certain
legal matters relating to the offering will be passed upon for the underwriter by Golenbock Eiseman Assor Bell &amp; Peskoe, 437
Madison Avenue, 40<SUP>th</SUP> Floor, New York, New York 10022.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><A NAME="ps_11"></A><B>EXPERTS</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Gumbiner Savett Inc., independent registered
public accounting firm, has audited our&nbsp;financial statements included in our Annual Report on Form 10-K for the year ended
December&nbsp;31, 2013, as set forth in their report, which is incorporated by reference in this prospectus supplement. Our financial
statements are incorporated by reference in reliance on the report of Gumbiner Savett Inc., given on their authority as experts
in accounting and auditing.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="ps_12"></A>WHERE YOU CAN FIND MORE INFORMATION</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have filed with the SEC a registration
statement on Form S-3 under the Securities Act of 1933, as amended (the &ldquo;Securities Act&rdquo;), with respect to the securities
offered by this prospectus supplement and the accompanying prospectus. This prospectus supplement and the accompanying prospectus,
which form a part of the registration statement, do not contain all of the information set forth in the registration statement
and its exhibits and schedules, certain parts of which are omitted in accordance with the SEC&rsquo;s rules and regulations. For
further information about us and the securities being offered, we refer you to the registration statement and to such exhibits
and schedules. You may review a copy of the registration statement, without charge, at the SEC&rsquo;s public reference room located
at 100 F. Street, N.E., Washington, D.C. 20549 as well as through the SEC&rsquo;s website at http://www.sec.gov. Please call the
SEC at 1-800-SEC-0330 for more information about the operation of the Public Reference Room. Please be aware that statements in
this prospectus supplement and the accompanying prospectus referring to a contract or other document are summaries and you should
refer to the exhibits that are part of the registration statement for a copy of the contract or other document.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">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 Public Reference Room and website of the SEC referred to above. We maintain a website at http://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&nbsp;13(a) or 15(d) 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
supplement.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><A NAME="ps_13"></A><B>INFORMATION INCORPORATED BY REFERENCE</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The SEC and applicable law permits us to
&ldquo;incorporate by reference&rdquo; into this prospectus information that we have or may in the future file with or furnish
to the SEC. This means that we can disclose important information by referring you to those documents. You should read carefully
the information incorporated herein by reference because it is an important part of this prospectus supplement. We hereby incorporate
by reference the following documents into this prospectus supplement and the accompanying prospectus:</P>

<P STYLE="font: 10pt Symbol; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif">Our
                                         Annual Report on Form 10-K for the fiscal year ended December 31, 2013, as filed with
                                         the SEC on March 11, 2014;</FONT></TD>
</TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">Our
                                         Quarterly Report on Form 10-Q for the quarter ended March 31, 2014, as filed with the
                                         SEC on May 8, 2014;</FONT></TD></TR></TABLE>

<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;&nbsp;&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">Our
                                         Quarterly Report on Form 10-Q for the quarter ended June 30, 2014, as filed with the
                                         SEC on August 12, 2014;</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif">Our
                                         Quarterly Report on Form 10-Q for the quarter ended September 30, 2014, as filed with
                                         the SEC on November 13, 2014;</FONT></TD>
</TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif">All
                                         information in our proxy statement filed with the SEC on March 18, 2014 to the extent
                                         incorporated by reference in our Annual Report on Form 10-K for the year ended December
                                         31, 2013; and</FONT></TD>
</TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif">Our
Current Reports on Form 8-K filed with the SEC on February 28, 2014, May 8, 2014, December 12, 2014 and February 5, 2015; and</FONT></TD>
</TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">The
                                         description of our common stock included in our Form 8-A filed with the SEC on April
                                         23, 2012.</FONT></TD></TR></TABLE>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Additionally, all documents filed by us
with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act, (other than any portions of filings that are furnished
rather than filed pursuant to Items 2.02 and 7.01 of a Current Report on Form 8-K, unless otherwise stated therein), after the
date of this prospectus supplement and before the termination or completion of this offering shall be deemed to be incorporated
by reference into this prospectus supplement from the respective dates of filing of such documents. Any information that we subsequently
file with the SEC that is incorporated by reference as described above will automatically update and supersede any previous information
that is part of this prospectus supplement and the accompanying prospectus.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Upon written or oral request, we will provide
you without charge, a copy of any or all of the documents incorporated by reference, other than exhibits to those documents unless
the exhibits are specifically incorporated by reference in the documents. Please send requests to ClearSign Combustion Corporation,
12870 Interurban Avenue South, Seattle, Washington 98168, Attn: Chief Financial Officer, Telephone: (206) 673-4848.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="text-transform: uppercase"><B>Disclosure
of Commission Position on Indemnification</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="text-transform: uppercase"><B>for
Securities Act Liabilities</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-indent: 0.5in">Insofar as indemnification for liabilities
arising under the Securities Act of 1933 may be permitted to directors, officers or persons controlling the company, we have been
informed 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.</P>

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

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



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

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><IMG SRC="tlogo.jpg" ALT=""></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;$30,000,000</B></P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>147,618 Shares of Common Stock Offered
by Selling Shareholders</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">By this prospectus
and an accompanying prospectus supplement, we may from time to time offer and sell, in one or more offerings, up to $30,000,000
in any combination of common stock, preferred stock and warrants. Also, the selling shareholders identified in this prospectus
may, from time to time, offer and sell up to 147,618 shares of common stock. See the section of this prospectus titled &ldquo;Selling
Shareholders.&rdquo;</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">We or any selling
stockholder may offer these securities from time to time in amounts, at prices and on other terms to be determined at the time
of offering. We or any selling stockholder may offer and sell these securities to or through underwriters, dealers or agents, or
directly to investors, on a continuous or delayed basis. The supplements to this prospectus will provide the specific terms of
the plan of distribution. The price to the public of such securities and the net proceeds we expect to receive from such sale will
also be set forth in a prospectus supplement. We will not receive any proceeds from the sale of our common stock by the selling
shareholders.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Our common stock
is listed on the NASDAQ Capital Market under the symbol &ldquo;CLIR&rdquo;. On May 3, 2013, the closing price of our common stock
as reported by the NASDAQ Capital Market was $8.81 per share. The aggregate market value of our outstanding voting common stock
held by non-affiliates, based upon a closing sale price of our common stock on May 3, 2013 was $60,417,000. During the 12 calendar
month period that ends on, and includes, the date of this prospectus, we have not offered any securities pursuant to General Instruction
I.B.6. of Form S-3.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white"><B><I>We are an
&ldquo;emerging growth company&rdquo; under the federal securities laws and will be subject to reduced public company reporting
requirements. An investment in our securities may be considered speculative and involves a high degree of risk, including the risk
of a substantial loss of your investment. See &ldquo;Risk Factors&rdquo; on page 6 for more information on the risks you should
consider before buying our securities.&nbsp;&nbsp;An investment in our securities is not suitable for all investors. We intend
to continue to issue our securities in this offering and, as a result, your ownership in us is subject to dilution.&nbsp;</I></B></P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">The date of this prospectus is May 30, 2013.</P>

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

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


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

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top; width: 95%"><A HREF="#p1_001"><font style="font: 10pt Times New Roman, Times, Serif">ABOUT THIS PROSPECTUS</font></A></td>
    <TD STYLE="vertical-align: bottom; width: 5%; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">1</font></td></tr>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_002">DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS</A></font></td>
    <TD STYLE="vertical-align: bottom; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">2</font></td></tr>
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_003">OUR BUSINESS</A></font></td>
    <TD STYLE="vertical-align: bottom; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">3</font></td></tr>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_004">RISK FACTORS</A></font></td>
    <TD STYLE="vertical-align: bottom; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">6</font></td></tr>
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_005">USE OF PROCEEDS</A></font></td>
    <TD STYLE="vertical-align: bottom; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">6</font></td></tr>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_006">DILUTION</A></font></td>
    <TD STYLE="vertical-align: bottom; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">6</font></td></tr>
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_007">DESCRIPTION OF SECURITIES THAT MAY BE OFFERED</A></font></td>
    <TD STYLE="vertical-align: bottom; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">6</font></td></tr>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_008">SELLING SHAREHOLDERS</A></font></td>
    <TD STYLE="vertical-align: bottom; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">11</font></td></tr>
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_009">PLAN OF DISTRIBUTION</A></font></td>
    <TD STYLE="vertical-align: bottom; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">12</font></td></tr>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_010">LEGAL MATTERS</A></font></td>
    <TD STYLE="vertical-align: bottom; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">15</font></td></tr>
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_011">EXPERTS</A></font></td>
    <TD STYLE="vertical-align: bottom; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">15</font></td></tr>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_012">WHERE YOU CAN FIND MORE INFORMATION</A></font></td>
    <TD STYLE="vertical-align: bottom; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">15</font></td></tr>
<TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_013">INFORMATION INCORPORATED BY REFERENCE</A></font></td>
    <TD STYLE="vertical-align: bottom; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">16</font></td></tr>
<TR STYLE="background-color: White">
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif"><A HREF="#p1_014">DISCLOSURE OF COMMISSION POSITION ON INDEMNIFICATION FOR SECURITIES ACT LIABILITIES</A></font></td>
    <TD STYLE="vertical-align: bottom; text-align: center"><font style="font: 10pt Times New Roman, Times, Serif">16</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="p1_001"></A>ABOUT THIS PROSPECTUS</B></P>

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

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

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

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

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

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

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

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

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="p1_002"></A>DISCLOSURE REGARDING FORWARD-LOOKING
STATEMENTS</B></P>

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

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&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: 15%">&nbsp;</td>
    <TD STYLE="width: 10%"><font style="font: 10pt Times New Roman, Times, Serif">&middot;</font></td>
    <TD STYLE="width: 75%"><font style="font: 10pt Times New Roman, Times, Serif">our limited cash and our history of losses;</font></td></tr>
<tr style="vertical-align: top">
    <TD>&nbsp;</td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">&middot;</font></td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">our ability to achieve profitability;</font></td></tr>
<tr style="vertical-align: top">
    <TD>&nbsp;</td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">&middot;</font></td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">our limited operating history;</font></td></tr>
<tr style="vertical-align: top">
    <TD>&nbsp;</td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">&middot;</font></td>
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">emerging competition and rapidly advancing technology in our
        industry that may outpace</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">our technology;</P></td></tr>
<tr style="vertical-align: top">
    <TD>&nbsp;</td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">&middot;</font></td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">customer demand for the products and services we develop;</font></td></tr>
<tr style="vertical-align: top">
    <TD>&nbsp;</td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">&middot;</font></td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">the impact of competitive or alternative products, technologies and pricing;</font></td></tr>
<tr style="vertical-align: top">
    <TD>&nbsp;</td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">&middot;</font></td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">our ability to manufacture any products we develop;</font></td></tr>
<tr style="vertical-align: top">
    <TD>&nbsp;</td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">&middot;</font></td>
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">general economic conditions and events and the impact they may
        have on us and our potential</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">customers;</P></td></tr>
<tr style="vertical-align: top">
    <TD>&nbsp;</td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">&middot;</font></td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">our ability to obtain adequate financing in the future;</font></td></tr>
<tr style="vertical-align: top">
    <TD>&nbsp;</td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">&middot;</font></td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">our ability to continue as a going concern;</font></td></tr>
<tr style="vertical-align: top">
    <TD>&nbsp;</td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">&middot;</font></td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">our success at managing the risks involved in the foregoing items; and</font></td></tr>
<tr style="vertical-align: top">
    <TD>&nbsp;</td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">&middot;</font></td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">other factors discussed in this prospectus.</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In some cases, you can identify forward-looking
statements by terminology such as &lsquo;&lsquo;may,&rsquo;&rsquo; &lsquo;&lsquo;will,&rsquo;&rsquo; &lsquo;&lsquo;should,&rsquo;&rsquo;
&lsquo;&lsquo;could,&rsquo;&rsquo; &lsquo;&lsquo;expects,&rsquo;&rsquo; &lsquo;&lsquo;plans,&rsquo;&rsquo; &lsquo;&lsquo;intends,&rsquo;&rsquo;
&lsquo;&lsquo;anticipates,&rsquo;&rsquo; &lsquo;&lsquo;believes,&rsquo;&rsquo; &lsquo;&lsquo;estimates,&rsquo;&rsquo; &lsquo;&lsquo;predicts,&rsquo;&rsquo;
&lsquo;&lsquo;potential,&rsquo;&rsquo; or &lsquo;&lsquo;continue&rsquo;&rsquo; 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; text-indent: 0.5in">&nbsp;</P>


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="p1_003"></A>OUR BUSINESS</B></P>

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

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

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">We are a development stage company that designs
and develops technologies that aim to improve key performance characteristics of combustion systems including energy efficiency,
emissions control, fuel flexibility and overall cost effectiveness.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">We believe that our Electrodynamic Combustion
Control&trade; (ECC&trade;) technology could allow customers to benefit from substantially reduced costs associated with the construction
(including refurbishment and upgrade), operation and maintenance of these systems, as compared to combustion systems that use currently
available technology. We also believe that our technology could improve emissions control performance and meet regulatory standards
while at the same time yielding a significant increase in energy efficiency, thereby substantially reducing the cost of compliance
with air quality regulations. Our technology introduces a computer-controlled electric field into the combustion zone to allow
for more precise control of flame shape and heat transfer. This same technique can also be used to modify the complex chemical
reactions that occur during combustion in order to minimize harmful emissions while maximizing system efficiency. We believe our
technology can be adapted to various fuel types and multiple system sizes and configurations, and can be deployed on both a retrofit
and new-build basis.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&nbsp;</P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">Nearly two-thirds of the world&rsquo;s total
energy consumption is accounted for by combustion of hydrocarbon and other fuels in boilers, furnaces, kilns and turbines. These
are used to generate electrical power, to provide heat for all manner of industrial processes and for building heat and produce
more than 50 quadrillion British thermal units (BTUs) of energy annually in the U.S. In order to maximize energy efficiency while
keeping pace with regulatory guidelines for air pollution emissions, operators of these systems are continually installing, maintaining
and upgrading a variety of costly process control, air pollution control and monitoring systems. In its December 2012 analysis,
The McIlvaine Company projected that $44 billion will be invested globally in 2013 in equipment, instrumentation, and consumables
to reduce air pollution, representing a 26% increase over the 2012 total of $35 billion. &nbsp;</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt"><I>Overview.</I>&nbsp;While our technology
has not been deployed commercially, nor has it been tested or verified by any independent third party, if the results we have observed
in our laboratory testing can be replicated&nbsp;on a commercial scale, we believe our proprietary technology platform may increase
energy efficiency and improve fuel flexibility and environmental performance for most types of industrial and commercial combustion
systems.&nbsp;&nbsp;We believe our technology could compare favorably with current industry-standard air pollution control and
efficiency technologies including electrostatic precipitators, fabric filters, selective catalytic reduction devices, low- and
ultra-low NOx burners (which address nitrogen oxides), excess air systems and other such technologies. Such systems account for
the majority of combustion energy utilization globally. These include:</P>

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

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

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">hydrocarbon and chemical processing industries,</FONT></TD></TR></TABLE>

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

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

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">gas utility turbines and turbines used in commercial and military
aviation, and</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">all manner of industrial and commercial steam generation and industrial
process heat.</FONT></TD></TR></TABLE>

<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-indent: 45pt"><I>Technical requirements.&nbsp;</I>Our technology
consists, in its simplest form, of four major components: (a) a computer, (b) standard software delivering proprietary algorithms
to (c) a power amplifier (resident outside the combustion chamber) and (d) electrode(s) (inside the combustion chamber). The electrodes
are optimized in material and shape to best suit the specific geometry of a given installation. We have also demonstrated a technique
to apply ECC to a combustion system without requiring an electrode to have physical contact with the flame. Because the system&rsquo;s
basic components are available &lsquo;off the shelf&rsquo;, or require manufacturing techniques that are well within the current
state of the art, we do not depend on technology external to the Company that has not yet been developed.&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">We believe our technology can be retrofitted
to existing combustion systems to improve their performance and has the potential to provide substantial savings in both capital
and operating costs, or, for new-builds, can serve as the basis for fundamental improvements in the design, cost and operation
of combustion systems. We believe the economic gain realized by an operator could be significant in both reduced capital expenditures
and savings in annual operating and maintenance costs (including reductions in those costs associated with fuel consumption and
emissions).</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The gain in energy efficiency provided by
our technology in boilers, kilns, furnaces and turbines stems in part from our ability to precisely control the flow of hot gases
within a gas volume. In most cases, efficiency is increased by increasing heat flux onto targeted surfaces and reducing heat loss
from other surfaces. Additionally, because the formation of pollutants is greatly reduced at the source, the &lsquo;load&rsquo;
placed on downstream pollution control equipment is also reduced, lowering both capital and operating expense and yielding a positive
return on investment for system operators.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Research and Development Plan.&nbsp;</I>We
have tested aspects of our technology&nbsp;on our&nbsp;5,000 BTU and 25,000 BTU bench top scale prototypes and&nbsp;our 1 million
BTU research furnace. Our technology has not been tested or verified by any independent third party. Our research and development&nbsp;efforts
are now focused on the following sequence of activities:&nbsp;</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif"><I>Scale up to commercially relevant sizes.&nbsp;</I>We have finalized
designs and built what we believe to be a commercially relevant furnace and burners. We have assembled a group of technical advisors
comprised of subject matter experts in the areas of combustion, pollution control, physics, aeronautics and chemistry. We have
identified key potential development partners and customers with whom we are engaged in discussions to apply our technology to
their particular use at commercially relevant scale, which can be 1 million BTUs or greater.</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif"><I>Site demonstration at full scale.&nbsp;</I>We plan to demonstrate
our technology at one or more selected commercial sites. If achieved, these early site demonstrations will be aimed at retrofitting
or replacing one or two burners in multi-burner systems with an eye toward evaluation of our technology at full scale in one or
more operating systems.</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif"><I>First installation.&nbsp;</I>Assuming the successful demonstration
of small numbers of burners in multi-burner systems, we plan to retrofit an entire furnace with our technology applied to all burners.
We believe that such a demonstration would provide the impetus for commercial adoption within the applicable industry.</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif"><I>Enhancement of our intellectual property portfolio.&nbsp;</I>We
have generated more than 150 inventions that we believe to be patentable subject matter which we have been and will continue to
protect through patent application filings. As of March 31, 2013, we have filed 104 patent applications.</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"><B>The Combustion Markets</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt"><I>Overview</I>. We are seeking to enter
the combustion and emissions control market and to establish ourselves in a highly competitive industry against companies that
have both substantially greater financial resources than we do and established products.&nbsp;&nbsp;However, we believe that our
technology could offer a unique and powerful ability to improve energy efficiency and enhance operation while reducing many pollutants
at the source. We view our market as divided into two broad segments:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&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-indent: 45pt">&bull;&nbsp;<I>Industrial combustion</I>&nbsp;includes
both solid fuel systems, such as cement kilns, wood and biomass furnaces, and industrial coal systems as well as gas-fired systems,
such as down-fired petrochemical reformers and natural gas-fired boilers.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&bull;&nbsp;<I>Power generation</I>&nbsp;includes
electric power plants fueled by pulverized coal and those utilizing gas-turbines.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 45pt">In each market segment and sub-segment, we
plan to initially market solutions that we believe could be cost-effective retrofitting of our technology onto existing, standard
system designs to simultaneously improve both their energy efficiency and pollution control characteristics.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Partnership Strategy</I>. We believe
that our Electrodynamic Combustion Control technology has the potential to transform industries that rely upon combustion, and
is broadly applicable in large, scalable, global markets.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We intend to form research and development
partnerships to develop our technology within the industrial combustion and power generation segments.&nbsp;&nbsp;Among the types
of potential partners we will seek to establish relationships with will be:&nbsp;</P>

<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%">
<tr style="vertical-align: top">
    <td style="width: 7%">&nbsp;</td>
    <td style="width: 3%"><font style="font: 10pt Times New Roman, Times, Serif">&middot;</font></td>
    <td style="width: 90%"><font style="font: 10pt Times New Roman, Times, Serif">Large OEMs interested in ECC technology;</font></td></tr>
<tr style="vertical-align: top">
    <td>&nbsp;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">&middot;</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">Engineering and construction companies interested in differentiating their offerings while increasing profitability;</font></td></tr>
<tr style="vertical-align: top">
    <td>&nbsp;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">&middot;</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">Industry research groups, whose mission is the development and testing of new technologies for the eventual benefit of their member companies; and</font></td></tr>
<tr style="vertical-align: top">
    <td>&nbsp;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">&middot;</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">Government entities such as the U.S. Department of Energy, who are chartered with the development of longer-range and potentially disruptive energy technologies.</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In April 2013, we announced our intention
to enter into a development agreement with Grandeg, a European manufacturer of commercial wood pellet boiler systems. Under the
agreement, we will develop solutions based on our ECC technology for both retrofit into existing Grandeg biomass boilers as well
as for integration into new product designs. Grandeg has indicated its intent to provide up to $500,000 in funding to support a
phased initial project that is expected to begin upon execution of a definitive agreement, with the goal of releasing a first commercial
solution to the market during 2014. While a definitive agreement is expected to be executed by June 2013, there is no assurance
that terms will be reached or a final agreement executed.</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our facilities and executive offices are
located at 12870 Interurban Avenue South, Seattle, Washington 98168, and our telephone number is (206) 673-4848. We were incorporated
in Washington on January 23, 2008. Additional information about us is available on our website at www.clearsign.com. The information
contained on or that may be obtained from our website is not, and shall not be deemed to be, a part of this prospectus. Our common
stock, par value $0.0001 per share, is currently traded on The NASDAQ Capital Market under the ticker symbol &ldquo;CLIR.&rdquo;</P>

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

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

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; background-color: white"><B><A NAME="p1_004"></A>RISK FACTORS</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in"><I>&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Investing in our common stock involves
a high degree of risk. Please see the risk factors set forth in Part I, Item 1A of our Annual Report on Form 10-K and other filings
we make with the SEC, which are incorporated by reference in this prospectus. Additional risk factors may be included in a prospectus
supplement relating to a particular offering of securities. Before making an investment decision, you should carefully consider
these risks as well as other information we include or incorporate by reference in this prospectus. The risks and uncertainties
we have described are not the only ones we face. Additional risks and uncertainties not presently known to us or that we currently
deem immaterial may also affect our business operations. These risks could materially affect our business, results of operations
or financial condition and cause the value of our securities to decline.</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.25in"><I>&nbsp;</I></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="p1_005"></A>USE OF PROCEEDS</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Unless we state otherwise in an accompanying
prospectus supplement, we intend to use the net proceeds from the sale of the securities offered by us under this prospectus and
any related prospectus supplement for general corporate purposes. These purposes may include capital expenditures and additions
to working capital.&nbsp;When a particular offering of securities is made, the prospectus supplement relating to that offering
will set forth our intended use of the net proceeds we receive from the sale of the securities. Pending the application of the
net proceeds, we may invest the proceeds in short-term, interest-bearing instruments or other investment-grade securities. We will
not receive any proceeds from the sales, if any, of the shares of common stock being offered and sold by the selling shareholders
or their pledgees, donees, transferees or other successors in interest.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="p1_006"></A>DILUTION</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We will set forth in a prospectus supplement
the following information regarding any material dilution of the equity interests of investors purchasing securities sold by ClearSign
in an offering under this prospectus:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&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: 3%">&nbsp;</td>
    <td style="width: 3%"><font style="font: 10pt Symbol">&middot;</font></td>
    <td style="width: 94%"><font style="font: 10pt Times New Roman, Times, Serif">the net tangible book value per share of our equity securities before and after the offering;</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%">
<tr style="vertical-align: top">
    <td style="width: 3%">&nbsp;</td>
    <td style="width: 3%"><font style="font: 10pt Symbol">&middot;</font></td>
    <td style="width: 94%"><font style="font: 10pt Times New Roman, Times, Serif">the amount of the increase in such net tangible book value per share attributable to the cash payments made by purchases in the offering; and</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%">
<tr style="vertical-align: top">
    <td style="width: 3%">&nbsp;</td>
    <td style="width: 3%"><font style="font: 10pt Symbol">&middot;</font></td>
    <td style="width: 94%"><font style="font: 10pt Times New Roman, Times, Serif">the amount of the immediate dilution from the public offering price which will be absorbed by such purchasers.</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="p1_007"></A>DESCRIPTION OF THE SECURITIES THAT MAY
BE OFFERED</B></P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following summary of the rights of our
common stock is not complete and is subject to and qualified in its entirety by reference to our articles of incorporation and
bylaws, copies of which are incorporated by reference to our registration statement on Form S-1. See &ldquo;Where You Can Find
More Information.&rdquo;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have 64,500,000 shares of capital stock
authorized under our articles of incorporation, consisting of 62,500,000 shares of common stock and 2,000,000 shares of preferred
stock.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">As of May&nbsp;6, 2013 we had 8,793,265
shares of common stock issued and outstanding. Our authorized but unissued shares of common stock are available for issuance without
further action by our shareholders, unless such action is required by applicable law or the rules of the NASDAQ Capital Market
or any other stock exchange or automated quotation system on which our securities may become listed or traded. If the approval
of our shareholders is not so required, our board of directors may determine not to seek stockholder approval.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Holders of our common stock are entitled
to such dividends as may be declared by our board of directors out of funds legally available for such purpose, subject to any
preferential dividend rights of any then outstanding preferred stock. The shares of common stock are neither redeemable nor convertible.
Holders of common stock have no preemptive or subscription rights to purchase any of our securities.</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Each holder of our common stock is entitled
to one vote for each such share outstanding in the holder&rsquo;s name. No holder of common stock is entitled to cumulate votes
in voting for directors.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In the event of our liquidation, dissolution
or winding up, the holders of our common stock are entitled to receive pro rata our assets which are legally available for distribution,
after payments of all debts and other liabilities and subject to the prior rights of any holders of preferred stock then outstanding.
All of the outstanding shares of our common stock are fully paid and non-assessable. The shares of common stock offered by this
prospectus will also be fully paid and non-assessable.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our common stock is listed on the NASDAQ
Capital Market under the symbol &ldquo;CLIR&rdquo;. On May&nbsp;3,&nbsp;2013, the last sale price of our common stock was $8.81
per share. The transfer agent and registrar for our common stock is VStock Transfer, LLC. Its address is 77 Spruce Street, Suite
201, Cedarhurst, New York 11516, and its telephone number is (212) 828-8436.</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our articles of incorporation permit us
to issue up to 2,000,000 shares of preferred stock in one or more series and with rights and preferences that may be fixed or designated
by our board of directors without any further action by our shareholders. We currently have no shares of preferred stock outstanding.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Subject to the limitations prescribed in
our articles of incorporation and under Washington law, our articles of incorporation authorize the board of directors, from time
to time by resolution and without further stockholder action, to provide for the issuance of shares of preferred stock, in one
or more series, and to fix the designation, limitations, voting powers, preferences and relative rights of the shares and to fix
the qualifications, limitations and restrictions thereof.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Description of Warrants to Purchase Common
Stock or Preferred Stock</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We may issue warrants for the purchase of
our preferred stock or common stock, which we refer to in this prospectus as &ldquo;equity warrants&rdquo;. As explained below,
each equity warrant will entitle its holder to purchase our equity securities at an exercise price set forth in, or to be determined
as set forth in, the related prospectus supplement. Equity warrants may be issued separately or together with equity securities.
The equity warrants are to be issued under equity warrant agreements.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The particular terms of each issue of equity
warrants and the equity warrant agreement relating to the equity warrants will be described in the applicable prospectus supplement,
including, as applicable:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&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: 3%">&nbsp;</td>
    <td style="width: 3%"><font style="font: 10pt Symbol">&middot;</font></td>
    <td style="width: 94%"><font style="font: 10pt Times New Roman, Times, Serif">the title of the equity warrants;</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%">
<tr style="vertical-align: top">
    <td style="width: 3%">&nbsp;</td>
    <td style="width: 3%"><font style="font: 10pt Symbol">&middot;</font></td>
    <td style="width: 94%"><font style="font: 10pt Times New Roman, Times, Serif">the initial offering price;</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%">
<tr style="vertical-align: top">
    <td style="width: 3%">&nbsp;</td>
    <td style="width: 3%"><font style="font: 10pt Symbol">&middot;</font></td>
    <td style="width: 94%"><font style="font: 10pt Times New Roman, Times, Serif">the aggregate number of equity warrants and the aggregate number of shares of the equity security purchasable upon exercise of the equity warrants;</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%">
<tr style="vertical-align: top">
    <td style="width: 3%">&nbsp;</td>
    <td style="width: 3%"><font style="font: 10pt Symbol">&middot;</font></td>
    <td style="width: 94%"><font style="font: 10pt Times New Roman, Times, Serif">if applicable, the designation and terms of the equity securities with which the equity warrants are issued, and the number of equity warrants issued with each equity security;</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%">
<tr style="vertical-align: top">
    <td style="width: 3%">&nbsp;</td>
    <td style="width: 3%"><font style="font: 10pt Symbol">&middot;</font></td>
    <td style="width: 94%"><font style="font: 10pt Times New Roman, Times, Serif">the date on which the right to exercise the equity warrants will commence and the date on which the right will expire;</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%">
<tr style="vertical-align: top">
    <td style="width: 3%">&nbsp;</td>
    <td style="width: 3%"><font style="font: 10pt Symbol">&middot;</font></td>
    <td style="width: 94%"><font style="font: 10pt Times New Roman, Times, Serif">if applicable, the minimum or maximum number of the equity warrants that may be exercised at any one time;</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%">
<tr style="vertical-align: top">
    <td style="width: 3%">&nbsp;</td>
    <td style="width: 3%"><font style="font: 10pt Symbol">&middot;</font></td>
    <td style="width: 94%"><font style="font: 10pt Times New Roman, Times, Serif">anti-dilution provisions of the equity warrants, if any;</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</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="font: 10pt Times New Roman, Times, Serif; width: 100%">
<tr style="vertical-align: top">
    <td style="width: 3%">&nbsp;</td>
    <td style="width: 3%"><font style="font: 10pt Symbol">&middot;</font></td>
    <td style="width: 94%"><font style="font: 10pt Times New Roman, Times, Serif">redemption or call provisions, if any, applicable to the equity warrants;</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%">
<tr style="vertical-align: top">
    <td style="width: 3%">&nbsp;</td>
    <td style="width: 3%"><font style="font: 10pt Symbol">&middot;</font></td>
    <td style="width: 94%"><font style="font: 10pt Times New Roman, Times, Serif">any additional terms of the equity warrants, including terms, procedures and limitations relating to the exchange and exercise of the equity warrants; 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="font: 10pt Times New Roman, Times, Serif; width: 100%">
<tr style="vertical-align: top">
    <td style="width: 3%">&nbsp;</td>
    <td style="width: 3%"><font style="font: 10pt Symbol">&middot;</font></td>
    <td style="width: 94%"><font style="font: 10pt Times New Roman, Times, Serif">the exercise price.</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Holders of equity warrants will not be entitled,
solely by virtue of being holders, to vote, to consent, to receive dividends, to receive notice as shareholders with respect to
any meeting of shareholders for the election of directors or any other matter, or to exercise any rights whatsoever as a holder
of the equity securities purchasable upon exercise of the equity warrants.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Anti-Takeover Effects of Certain Provisions of Washington
Law and Our Charter Documents</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following is a summary of certain provisions
of Washington law, our articles of incorporation and our bylaws. This summary does not purport to be complete and is qualified
in its entirety by reference to the corporate law of Washington and our articles of incorporation and bylaws.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Effect of Washington Anti-Takeover Statute.</I>&nbsp;We
are subject to Section 23B.19 of the Washington Revised Statutes, an anti-takeover law (the &ldquo;Anti-Takeover Statute&rdquo;).
In general, the Anti-Takeover Statute prohibits a target corporation from entering into a significant business transaction with
an acquiring person for a period of five years following the acquiring person&rsquo;s share acquisition unless</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">the share acquisition is exempt because it was inadvertently made
and the acquiring person divests himself of a sufficient amount of the voting shares so that he is no longer the beneficial owner,
directly or indirectly, of 10% or more of the outstanding voting shares of the target corporation and would not have, during the
five year period prior to the announcement date of the significant business transaction been an acquiring person but for the inadvertent
acquisition,</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">the significant business transaction or the purchase of shares made
by the acquiring person is approved prior to the acquiring person&rsquo;s share acquisition time by a majority of the members of
the board of directors of the target corporation; or</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">at or subsequent to the acquiring person&rsquo;s share acquisition
time, the significant business transaction is approved by a majority of the members of the board of directors of the target corporation
and approved at an annual or special meeting of shareholders, and not by written consent, by the affirmative vote of at least two-thirds
of the outstand ing voting shares, except shares beneficially owned by or under the voting control of the acquiring person.</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 Anti-Takeover Statute generally defines
an &ldquo;acquiring person&rdquo; as a person or group of persons, other than the target corporation or a subsidiary of the target
corporation, who beneficially owns 10% or more of the outstanding voting shares of the target corporation. The term &ldquo;acquiring
person&rdquo; does not include a person who (a) beneficially owned 10% or more of the outstanding voting shares of the target corporation
on March 23, 1988; (b) acquires its shares by gift, inheritance, or in a transaction in which no consideration is exchanged; (c)
exceeds the 10% threshold as a result of action taken solely by the target corporation, such as redemption of shares, unless that
person, by his own action, acquires additional shares of the target corporation; (d) beneficially was the owner of 10% or more
of the outstanding voting shares prior to the time the target corporation had a class of voting shares registered with the SEC
pursuant to section 12 or 15 of the Securities Exchange Act; or (e) beneficially was the owner of 10% or more of the outstanding
voting shares prior to the time the target corporation amended its articles of incorporation to provide that the corporation shall
be subject to the provisions of this chapter.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The Anti-Takeover Statute defines a &ldquo;significant
business transaction&rdquo; as:</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A
merger, share exchange, or consolidation of a target corporation or a subsidiary of a target corporation with (i) an acquiring
person, or (ii) any other domestic or foreign corporation which is, or after the merger, share exchange, or consolidation would
be, an affiliate or associate of the acquiring person;</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: 0pt 0 0pt 0.5in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A
sale, lease, exchange, mortgage, pledge, transfer, or other disposition or encumbrance, whether in one transaction or a series
of transactions, to or with an acquiring person or an affiliate or associate of an acquiring person of assets of a target corporation
or a subsidiary of a target corporation (i) having an aggregate market value equal to 5% or more of the aggregate market value
of all the assets, determined on a consolidated basis, of the target corporation, (ii) having an aggregate market value equal to
5% or more of the aggregate market value of all the outstanding shares of the target corporation, or (iii) representing 5% or more
of the earning power or net income, determined on a consolidated basis, of the target corporation;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in">(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
termination, while the corporation has an acquiring person and as a result of the acquiring person&rsquo;s acquisition of 10% or
more of the shares of the corporation, of 5% or more of the employees of the target corporation or its subsidiaries employed in
this state, whether at one time or over the five-year period following the share acquisition time;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in">(d)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
issuance, transfer, or redemption by a target corporation or a subsidiary of a target corporation, whether in one transaction or
a series of transactions, of shares or of options, warrants, or rights to acquire shares of a target corporation or a subsidiary
of a target corporation to or beneficially owned by an acquiring person or an affiliate or associate of an acquiring person except
pursuant to the exercise of warrants or rights to purchase shares offered, or a dividend, distribution, or redemption paid or made
pro rata to, all shareholders or holders of options, warrants, or rights to acquire shares of the target corporation, and except
for involuntary redemptions permitted by the target corporation&rsquo;s charter or by the law of this state or the state of incorporation;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in">(e)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
liquidation or dissolution of a target corporation proposed by, or pursuant to an agreement, arrangement, or understanding, whether
or not in writing, with an acquiring person or an affiliate or associate of an acquiring person;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in">(f)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A
reclassification of securities, including, without limitation, any shares split, shares dividend, or other distribution of shares
in respect of stock, or any reverse shares split, or recapitalization of a target corporation, or a merger or consolidation of
a target corporation with a subsidiary of the target corporation, or any other transaction, whether or not with or into or otherwise
involving an acquiring person, proposed by, or pursuant to an agreement, arrangement, or understanding, whether or not in writing,
with an acquiring person or an affiliate or associate of an acquiring person, that has the effect, directly or indirectly, of increasing
the proportionate share of the outstanding shares of a class or series of voting shares or securities convertible into voting shares
of a target corporation or a subsidiary of the target corporation that is directly or indirectly owned by an acquiring person or
an affiliate or associate of an acquiring person, except as a result of immaterial changes due to fractional share adjustments;
or</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in">(g)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A
receipt by an acquiring person or an affiliate or associate of an acquiring person of the benefit, directly or indirectly, except
proportionately as a shareholder of a target corporation, of loans, advances, guarantees, pledges, or other financial assistance
or tax credits or other tax advantages provided by or through a target corporation.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Finally, the Anti-Takeover Statute defines
a &ldquo;target corporation&rdquo; as:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&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: 7%">&nbsp;</td>
    <td style="width: 5%"><font style="font: 10pt Times New Roman, Times, Serif">(a)</font></td>
    <td style="width: 88%"><font style="font: 10pt Times New Roman, Times, Serif">Every domestic corporation, if:</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">(i)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
corporation has a class of voting shares registered with the SEC pursuant to Section 12 or 15 of the Securities Exchange Act; or&nbsp;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">(ii)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
corporation&rsquo;s articles of incorporation have been amended to provide that such a corporation shall be subject to the provisions
of this chapter, if the corporation did not have a class of voting shares registered with the SEC pursuant to section 12 or 15
of the Securities Exchange Act on the effective date of that amendment; and</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">&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 0pt 0.5in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Every
foreign corporation required to have a certificate of authority to transact business in the State of Washington if:</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">(i)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
corporation has a class of voting shares registered with the SEC pursuant to section 12 or 15 of the Securities Exchange Act;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">(ii)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
corporation&rsquo;s principal executive office is located in the state;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">(iii)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
corporation has: (A) more than 10% of its shareholders of record resident in the state; or (B) more than 10% of its shares owned
of record by state residents; or (C) 1,000 or more shareholders of record resident in the state;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">(iv)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A
majority of the corporation&rsquo;s employees, together with those of its subsidiaries, are residents of the state or the corporation,
together with its subsidiaries, employs more than one thousand residents of the state; and</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">(v)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A
majority of the corporation&rsquo;s tangible assets, together with those of its subsidiaries, measured by market value, are located
in the state or the corporation, together with its subsidiaries, has more than fifty million dollars&rsquo; worth of tangible assets
located in the state.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Our Charter Documents.</I>&nbsp;Our charter
documents include provisions that may have the effect of discouraging, delaying or preventing a change in control or an unsolicited
acquisition proposal that a shareholder might consider favorable, including a proposal that might result in the payment of a premium
over the market price for the shares held by our shareholders. Certain of these provisions are summarized in the following paragraphs.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Effects of authorized but unissued common
stock and blank check preferred stock.&nbsp;</I>One of the effects of the existence of authorized but unissued common stock and
undesignated preferred stock may be to enable our board of directors to make more difficult or to discourage an attempt to obtain
control of our Company by means of a merger, tender offer, proxy contest or otherwise, and thereby to protect the continuity of
management. If, in the due exercise of its fiduciary obligations, the board of directors were to determine that a takeover proposal
was not in our best interest, such shares could be issued by the board of directors without shareholder approval in one or more
transactions that might prevent or render more difficult or costly the completion of the takeover transaction by diluting the voting
or other rights of the proposed acquirer or insurgent shareholder group, by putting a substantial voting block in institutional
or other hands that might undertake to support the position of the incumbent board of directors, by effecting an acquisition that
might complicate or preclude the takeover, or otherwise.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In addition, our articles of incorporation
grant our board of directors broad power to establish the rights and preferences of authorized and unissued shares of preferred
stock. The issuance of shares of preferred stock could decrease the amount of earnings and assets available for distribution to
holders of shares of common stock. The issuance also may adversely affect the rights and powers, including voting rights, of those
holders and may have the effect of delaying, deterring or preventing a change in control of our Company.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Cumulative Voting.</I>&nbsp;Our articles
of incorporation do not provide for cumulative voting in the election of directors which would allow holders of less than a majority
of the stock to elect some directors.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Vacancies.&nbsp;</I>Our bylaws provide
that any vacancy occurring on our board of directors may be filled by the shareholders, by the board of directors or, if the directors
in office constitute less than a quorum, by the affirmative vote of a majority of the remaining directors.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Special Meeting of Shareholders.</I>&nbsp;A
special meeting of shareholders may only be called by our chairman of the board, the president or the board of directors or by
holders of at least 25% of all the votes entitled to be cast on any issue proposed to be considered at the special meeting.&nbsp;</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="p1_008"></A>SELLING SHAREHOLDERS</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have prepared this prospectus to allow
the selling shareholders named in the Selling Shareholder Table below to sell, from time to time, up to 147,618 shares of our common
stock. All of the common stock included in that table may be offered by the selling shareholders for their own account by means
of this prospectus. We will receive no proceeds from the sale of the shares held by the selling shareholders although, if the warrants
are exercised, we would receive $300,010 from the exercise of the warrants if a cashless exercise does not occur.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I><U>Registration of Warrants held by the
MDB Selling Shareholders</U></I>&nbsp;- As part of this prospectus, we are registering for resale 136,368 shares of common stock
underlying warrants. The shares described in the table below under the heading &ldquo;MDB Selling Shareholders&rdquo; consist of
shares of common stock that will be issued if these selling shareholders exercise their warrants. The warrants were originally
issued to MDB Capital Group, LLC (&ldquo;MDB&rdquo;) in partial compensation for services rendered to us by MDB in connection with
a private offering we undertook in April 2011. MDB subsequently transferred warrants covering 62,050 shares of our common stock
to its employees. The warrants include piggy-back registration rights, which the MDB Selling Shareholders have exercised. Within
the past three years, MDB has provided underwriting and investment banking services, consulting services, and intellectual property
services described in previously filed periodic reports, proxy statements and other information with the SEC.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I><U>Registration of Other Shares</U></I>&nbsp;-
As part of this prospectus, we are registering for resale 11,250 shares of common stock issued to John McFarland pursuant to the
ClearSign Combustion Corporation 2013 Consultant Stock Plan approved by the Company&rsquo;s shareholders on May 2, 2013 for consulting
services provided or to be provided in 2013. Since September 2011, Mr. McFarland has provided investor relations services to the
Company.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following table sets forth information
with respect to the common stock known to us to be beneficially owned by the selling shareholders as of May&nbsp;6, 2013, including
the total number of securities the selling shareholders may sell under this prospectus from time to time, and the number of securities
the selling shareholders will own thereafter assuming no other acquisitions or dispositions of our securities. However, we have
no way of determining the number of shares of common stock each will hold after this offering. Therefore, we have prepared the
table below on the assumption that the selling shareholders will sell all of the shares of common stock covered by this prospectus.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We may amend or supplement this prospectus
from time to time to update the disclosure set forth herein, however, if a selling shareholder transfers his or her interest in
the common stock warrants prior to the effective date of the registration statement of which this prospectus is a part, we will
be required to file a post-effective amendment to the registration statement to provide the information concerning the transferee.
Alternatively, if a selling shareholder transfers his or her interest in the common stock warrants after the effective date of
the registration statement of which this prospectus is a part, we may use a supplement to update this prospectus. See our discussion
titled &ldquo;Plan of Distribution&rdquo; for further information regarding the selling shareholders&rsquo; method of distribution
of these shares.</P>

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


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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0.5in"><B>&nbsp;</B></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 NOWRAP>&nbsp;</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="font-weight: bold; text-align: center">Securities</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD><TD NOWRAP>&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP>&nbsp;</TD><TD NOWRAP>&nbsp;</TD><TD NOWRAP>&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP>&nbsp;</TD><TD NOWRAP>&nbsp;</TD><TD NOWRAP>&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP>&nbsp;</TD><TD NOWRAP>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP>&nbsp;</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="font-weight: bold; text-align: center">Beneficially</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD><TD NOWRAP>&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP>&nbsp;</TD><TD NOWRAP>&nbsp;</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="font-weight: bold; text-align: center">Securities</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="font-weight: bold; text-align: center">%&nbsp;Beneficial</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP>&nbsp;</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="font-weight: bold; text-align: center">Owned&nbsp;Prior</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD><TD NOWRAP>&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP>&nbsp;</TD><TD NOWRAP>&nbsp;</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="font-weight: bold; text-align: center">Beneficially</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="font-weight: bold; text-align: center">Ownership</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP>&nbsp;</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="font-weight: bold; text-align: center">to</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="font-weight: bold; text-align: center">Securities&nbsp;Being</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="font-weight: bold; text-align: center">Owned&nbsp;After</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="font-weight: bold; text-align: center">After</TD><TD NOWRAP STYLE="font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Name</TD><TD NOWRAP STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Offering&nbsp;(1)</TD><TD NOWRAP STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD><TD NOWRAP STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Offered</TD><TD NOWRAP STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD><TD NOWRAP STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Offering&nbsp;(2)</TD><TD NOWRAP STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD><TD NOWRAP STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" NOWRAP STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Offering</TD><TD NOWRAP STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font-weight: bold; font-style: italic; text-align: left">MDB Selling Shareholders: &nbsp; </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="width: 48%; text-align: left">MDB Capital Group, LLC (3)(4) &nbsp; </TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; text-align: right">534,025</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; text-align: right">74,318</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; text-align: right">459,707</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; text-align: right">5.1</TD><TD STYLE="width: 1%; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Amy En-Mei Wang (4)(5)(6) &nbsp; </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">116,132</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">17,409</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">98,723</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1.1</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Christopher A. Marlett (4)(6)(7) &nbsp; </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">810,967</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">91,727</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">719,240</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">8.0</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Daniel E. Nagy (4)(6)(8) &nbsp; </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">13,365</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">865</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">12,500</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">0.1</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Gary A. Schuman (4)(6)(9) &nbsp; </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">6,812</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">312</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">6,500</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">0.1</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">George H. Brandon (4)(10)(11) &nbsp; </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">41,052</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">2,882</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">38,170</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">0.4</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Kevin M. Cotter (4)(6)(12) &nbsp; </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">30,867</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">2,882</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">27,985</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">0.3</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Robert C. Clifford (4)(6)(13) &nbsp; </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">66,507</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">2,882</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">63,625</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">0.7</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Robert M. Levande (4)(6)(14) &nbsp; </TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">134,708</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">17,409</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">117,299</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1.3</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font-weight: bold; text-align: left; padding-left: 9pt">Total of MDB Selling Shareholders &nbsp; </TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold; text-align: right">1,220,410</TD><TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold; text-align: right">136,368</TD><TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold; text-align: right">1,084,042</TD><TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold; text-align: right">11.9</TD><TD STYLE="font-weight: bold; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left"><font style="font: 10pt Times New Roman, Times, Serif">John McFarland (15) <b>&nbsp; &nbsp;</b></font></TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold; text-align: right">24,750</TD><TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold; text-align: right">11,250</TD><TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold; text-align: right">13,500</TD><TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold; text-align: right">0.2</TD><TD STYLE="font-weight: bold; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font-weight: bold; text-align: left; padding-left: 9pt">Total of Selling Shareholders &nbsp; </TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold; text-align: right">1,245,160</TD><TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold; text-align: right">147,618</TD><TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold; text-align: right">1,097,542</TD><TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold; text-align: right">11.9</TD><TD STYLE="font-weight: bold; text-align: left">%</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0.5in">&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: 1%">&nbsp;</td>
    <td style="width: 7%"><font style="font: 10pt Times New Roman, Times, Serif">(1)</font></td>
    <td style="width: 92%"><font style="font: 10pt Times New Roman, Times, Serif">Percentages stated in the above table are based on a total of 8,793,265 shares of common stock outstanding as of May 6, 2013.</font></td></tr>
<tr style="vertical-align: top">
    <td>&nbsp;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">(2)</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">Assumes that all of the shares offered hereby are sold and that shares owned before the offering but not offered hereby are not sold.</font></td></tr>
<tr style="vertical-align: top">
    <td>&nbsp;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">(3)</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">Includes 289,207 shares of common stock and 244,818 shares of common stock underlying two warrants. Christopher A. Marlett is CEO of MDB Capital Group, LLC, a broker-dealer, and has sole voting and dispositive power with respect to its shares of common stock.</font></td></tr>
<tr style="vertical-align: top">
    <td>&nbsp;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">(4)</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">The address of the security holder is 401 Wilshire Boulevard, Suite 1020, Santa Monica, California 90401.</font></td></tr>
<tr style="vertical-align: top">
    <td>&nbsp;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">(5)</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">Includes 74,573 shares of common stock and 41,559 shares of common stock underlying two warrants.</font></td></tr>
<tr style="vertical-align: top">
    <td>&nbsp;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">(6)</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">This security holder is an associated person of a broker-dealer.&nbsp; This person has represented to the Company that he or she received a portion of the securities as compensation, and he had no agreements or understanding, directly or indirectly, with any person to distribute the securities at the time of their acquisition.</font></td></tr>
<tr style="vertical-align: top">
    <td>&nbsp;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">(7)</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">Includes 183,490 shares of common stock and 89,859 shares of common stock underlying two warrants owned by Mr. Marlett. This amount also includes 3,593 shares of common stock owned by Integrated Surgical Systems, Inc. and 289,207 shares of common stock and 244,818 shares of common stock underlying two warrants owned by MDB Capital Group, LLC, for both of which Mr. Marlett is deemed the beneficial owner.&nbsp; Mr. Marlett is&nbsp;the CEO and a director of Integrated Surgical Systems, Inc. The board of directors of Integrated Surgical Systems, Inc., at large, holds voting and investment control over the securities held by the corporation.&nbsp; Mr. Marlett is also CEO of MDB Capital Group, LLC and has sole voting and dispositive power with respect to its shares of common stock.</font></td></tr>
<tr style="vertical-align: top">
    <td>&nbsp;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">(8)</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">Includes 12,500 shares of common stock and 865 shares of common stock underlying a warrant.</font></td></tr>
<tr style="vertical-align: top">
    <td>&nbsp;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">(9)</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">Includes 4,500 shares of common stock and 312 shares of common stock underlying a warrant.</font></td></tr>
<tr style="vertical-align: top">
    <td>&nbsp;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">(10)</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">Includes 18,040 shares of common stock and 21.512 shares of common stock underlying two warrants.</font></td></tr>
<tr style="vertical-align: top">
    <td>&nbsp;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">(11)</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">This security holder is an associated person of a broker-dealer.&nbsp; This person has represented to the Company that he acquired a portion of the securities as an investment and received a portion of the securities as compensation, and he had no agreements or understanding, directly or indirectly, with any person to distribute the securities at the time of their acquisition.</font></td></tr>
<tr style="vertical-align: top">
    <td>&nbsp;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">(12)</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">Includes 13,495 shares of common stock and 17,372 shares of common stock underlying two warrants.</font></td></tr>
<tr style="vertical-align: top">
    <td>&nbsp;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">(13)</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">Includes 25,995 shares of common stock and 21,512 shares of common stock underlying two warrants.</font></td></tr>
<tr style="vertical-align: top">
    <td>&nbsp;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">(14)</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">Includes 93,149 shares of common stock and 41,559 shares of common stock underlying two warrants.</font></td></tr>
<tr style="vertical-align: top">
    <td>&nbsp;</td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">(15)</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">Includes 11,250 shares of common stock held in escrow pending performance of consulting services in 2013. The address of the security holder is 2854 Johnson Ferry Road, Suite 200, Marietta, Georgia 30062.</font></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><A NAME="p1_009"></A>PLAN OF DISTRIBUTION</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">We or the selling
shareholders may offer and sell the securities in any one or more of the following ways:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&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: 0.25in">&nbsp;</td>
    <TD STYLE="width: 0.25in"><font style="font: 10pt Symbol">&middot;</font></td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">to or through underwriters, brokers or dealers;</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&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: 0.25in">&nbsp;</td>
    <TD STYLE="width: 0.25in"><font style="font: 10pt Symbol">&middot;</font></td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">directly to one or more other purchasers;</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&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: 0.25in">&nbsp;</td>
    <TD STYLE="width: 0.25in"><font style="font: 10pt Symbol">&middot;</font></td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">through a block trade in which the broker or dealer engaged to handle the block trade will attempt to sell the securities as agent, but may position and resell a portion of the block as principal to facilitate the transaction;</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&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: 0.25in">&nbsp;</td>
    <TD STYLE="width: 0.25in"><font style="font: 10pt Symbol">&middot;</font></td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">through agents on a best-efforts basis;</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&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: 0.25in">&nbsp;</td>
    <TD STYLE="width: 0.25in"><font style="font: 10pt Symbol">&middot;</font></td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">in &ldquo;at the market&rdquo; offerings, as defined in Rule 415 under the Securities Act, at negotiated prices, at prices prevailing at the time of sale or at prices related to such prevailing market prices, including sales made directly on NASDAQ or sales made through a market maker other than on an exchange or other similar offerings through sales agents; or</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&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: 0.25in">&nbsp;</td>
    <TD STYLE="width: 0.25in"><font style="font: 10pt Symbol">&middot;</font></td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">otherwise through any other method permitted by applicable law or a combination of any of the above methods of sale.</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&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-indent: 0.5in; background-color: white">In addition, we
may enter into option, share lending or other types of transactions that require us to deliver shares of common stock to an underwriter,
broker or dealer, who will then resell or transfer the shares of common stock under this prospectus. We may also enter into hedging
transactions with respect to our securities. For example,</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">we may:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&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: 0.25in">&nbsp;</td>
    <TD STYLE="width: 0.25in"><font style="font: 10pt Symbol">&middot;</font></td>
    <TD><font style="font: 10pt Times New Roman, Times, Serif">enter into transactions involving short sales of the shares of common stock by underwriters, brokers or dealers;</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white">
<tr style="vertical-align: top">
    <td style="width: 24px">&nbsp;</td>
    <td style="width: 24px"><font style="font: 10pt Symbol">&middot;</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">sell shares of common stock short and deliver the shares to close out short positions;</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white">
<tr style="vertical-align: top">
    <td style="width: 24px">&nbsp;</td>
    <td style="width: 24px"><font style="font: 10pt Symbol">&middot;</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">enter into option or other types of transactions that require the delivery shares of common stock to an underwriter, broker or dealer, who will then resell or transfer the shares of common stock under this prospectus; or</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white">
<tr style="vertical-align: top">
    <td style="width: 24px">&nbsp;</td>
    <td style="width: 24px"><font style="font: 10pt Symbol">&middot;</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">loan or pledge the shares of common stock to an underwriter, broker or dealer, who may sell the loaned shares or, in the event of default, sell the pledged shares.</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">We may enter into
derivative transactions with third parties, or sell securities not covered by this prospectus to third parties in privately negotiated
transactions. If the applicable prospectus supplement indicates, in connection with those derivatives, the third parties may sell
securities covered by this prospectus and the applicable prospectus supplement, including in short sale transactions. If so, the
third party may use securities pledged by or borrowed from us or others to settle those sales or to close out any related open
borrowings of stock, and may use securities received from us in settlement of those derivatives to close out any related open borrowings
of stock. The third party in such sale transactions will be an underwriter and, if not identified in this prospectus, will be identified
in the applicable prospectus supplement (or a post-effective amendment). In addition, we may otherwise loan or pledge securities
to a financial institution or other third party that in turn may sell the&nbsp;securities short using this prospectus. Such financial
institution or other third party may transfer its economic short position to investors in our securities or in connection with
a concurrent offering of other securities.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Each time we or
the selling shareholders sell securities, we or the selling shareholders will provide a prospectus supplement that will name any
underwriter, dealer or agent involved in the offer and sale of the securities. Any prospectus supplement will also set forth the
terms of the offering, including:</P>

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

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white">
<tr style="vertical-align: top">
    <td style="width: 24px">&nbsp;</td>
    <td style="width: 24px"><font style="font: 10pt Symbol">&middot;</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">the purchase price of the securities and the proceeds we or the selling shareholders will receive from the sale of the securities;</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">
<tr style="vertical-align: top">
    <td style="width: 24px">&nbsp;</td>
    <td style="width: 24px"><font style="font: 10pt Symbol">&middot;</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">any underwriting discounts and other items constituting underwriters&rsquo; compensation;</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white">
<tr style="vertical-align: top">
    <td style="width: 24px">&nbsp;</td>
    <td style="width: 24px"><font style="font: 10pt Symbol">&middot;</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">any public offering or purchase price and any discounts or commissions allowed or re-allowed or paid to dealers;</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white">
<tr style="vertical-align: top">
    <td style="width: 24px">&nbsp;</td>
    <td style="width: 24px"><font style="font: 10pt Symbol">&middot;</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">any commissions allowed or paid to agents;</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white">
<tr style="vertical-align: top">
    <td style="width: 24px">&nbsp;</td>
    <td style="width: 24px"><font style="font: 10pt Symbol">&middot;</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">any other offering expenses;</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white">
<tr style="vertical-align: top">
    <td style="width: 24px">&nbsp;</td>
    <td style="width: 24px"><font style="font: 10pt Symbol">&middot;</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">any securities exchanges on which the securities may be listed;</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white">
<tr style="vertical-align: top">
    <td style="width: 24px">&nbsp;</td>
    <td style="width: 24px"><font style="font: 10pt Symbol">&middot;</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">the method of distribution of the securities;</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white">
<tr style="vertical-align: top">
    <td style="width: 24px">&nbsp;</td>
    <td style="width: 24px"><font style="font: 10pt Symbol">&middot;</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">the terms of any agreement, arrangement or understanding entered into with the underwriters, brokers or dealers; and</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; background-color: white">
<tr style="vertical-align: top">
    <td style="width: 24px">&nbsp;</td>
    <td style="width: 24px"><font style="font: 10pt Symbol">&middot;</font></td>
    <td><font style="font: 10pt Times New Roman, Times, Serif">any other information we think is important.</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">If underwriters
or dealers are used in the sale, the securities will be acquired by the underwriters or dealers for their own account. The securities
may be sold from time to time by us or the selling shareholders in one or more transactions:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</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="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<tr>
    <TD STYLE="width: 10%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 3%"><font style="font: 10pt Times New Roman, Times, Serif">&bull;</font></td>
    <TD STYLE="vertical-align: top; width: 2%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 85%"><font style="font: 10pt Times New Roman, Times, Serif">at a fixed price or prices, which may be changed;</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<tr>
    <TD STYLE="vertical-align: top; width: 10%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 3%"><font style="font: 10pt Times New Roman, Times, Serif">&bull;</font></td>
    <TD STYLE="vertical-align: top; width: 2%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 85%"><font style="font: 10pt Times New Roman, Times, Serif">at market prices prevailing at the time of sale;</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<tr>
    <TD STYLE="width: 10%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 3%"><font style="font: 10pt Times New Roman, Times, Serif">&bull;</font></td>
    <TD STYLE="vertical-align: top; width: 2%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 85%"><font style="font: 10pt Times New Roman, Times, Serif">at prices related to such prevailing market prices;</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<tr>
    <TD STYLE="width: 10%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 3%"><font style="font: 10pt Times New Roman, Times, Serif">&bull;</font></td>
    <TD STYLE="vertical-align: top; width: 2%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 85%"><font style="font: 10pt Times New Roman, Times, Serif">at varying prices determined at the time of sale;&nbsp;or</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<tr>
    <TD STYLE="width: 10%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 3%"><font style="font: 10pt Times New Roman, Times, Serif">&bull;</font></td>
    <TD STYLE="vertical-align: top; width: 2%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 85%"><font style="font: 10pt Times New Roman, Times, Serif">at negotiated prices.</font></td></tr>
<tr>
    <TD>&nbsp;</td>
    <TD STYLE="vertical-align: top">&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">&nbsp;</td>
    <TD STYLE="vertical-align: top">&nbsp;</td>
    <TD STYLE="vertical-align: top"><font style="font: 10pt Times New Roman, Times, Serif">Such sales may be effected:</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<tr>
    <TD STYLE="width: 10%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 3%"><font style="font: 10pt Times New Roman, Times, Serif">&bull;</font></td>
    <TD STYLE="vertical-align: top; width: 2%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 85%">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">in transactions on any national securities exchange or quotation
        service on which the securities may be</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">listed or quoted at the time of sale;</P></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<tr>
    <TD STYLE="width: 10%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 3%"><font style="font: 10pt Times New Roman, Times, Serif">&bull;</font></td>
    <TD STYLE="vertical-align: top; width: 2%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 85%"><font style="font: 10pt Times New Roman, Times, Serif">in transactions in the over-the-counter market;</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<tr>
    <TD STYLE="width: 10%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 3%"><font style="font: 10pt Times New Roman, Times, Serif">&bull;</font></td>
    <TD STYLE="vertical-align: top; width: 2%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 85%">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">in block transactions in which the broker or dealer so engaged
        will attempt to sell the securities as agent</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">but may position and resell a portion of the block as principal
        to facilitate the transaction, or in crosses,</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">in which the same broker acts as an agent on both sides of the
        trade;</P></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<tr>
    <TD STYLE="width: 10%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 3%"><font style="font: 10pt Times New Roman, Times, Serif">&bull;</font></td>
    <TD STYLE="vertical-align: top; width: 2%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 85%"><font style="font: 10pt Times New Roman, Times, Serif">through the writing of options;&nbsp;or</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<tr>
    <TD STYLE="width: 10%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 3%"><font style="font: 10pt Times New Roman, Times, Serif">&bull;</font></td>
    <TD STYLE="vertical-align: top; width: 2%">&nbsp;</td>
    <TD STYLE="vertical-align: top; width: 85%"><font style="font: 10pt Times New Roman, Times, Serif">through other types of transactions.</font></td></tr>
</table>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Any shares of common
stock covered by this prospectus that qualify for sale pursuant to Rule 144 under the Securities Act may be sold under Rule 144
rather than pursuant to this prospectus.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">The securities
may be offered to the public either through underwriting syndicates represented by one or more managing underwriters or directly
by one or more of such firms. Unless otherwise set forth in the prospectus supplement, the obligations of underwriters or dealers
to purchase the securities offered will be&nbsp;subject to certain conditions precedent and the underwriters or dealers will be
obligated to purchase all the offered securities if any are purchased. Any public offering price and any discount or concession
allowed or reallowed or paid by underwriters or dealers to other dealers may be changed from time to time.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">The securities
may be sold directly by us, the selling shareholders or through agents as designated from time to time. Any agent involved in the
offer or sale of the securities in respect of which this prospectus is delivered will be named, and any commissions payable to
such agent will be set forth in, the prospectus supplement. Unless otherwise indicated in the prospectus supplement, any such agent
will be acting on a best efforts basis for the period of its appointment.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Offers to purchase
the securities offered by this prospectus may be solicited, and sales of the securities may be made by us or the selling shareholders
directly to institutional investors or others, who may be deemed to be underwriters within the meaning of the Securities Act with
respect to any resale of the securities. The terms of any offer made in this manner will be included in the prospectus supplement
relating to the offer.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Some of the underwriters,
dealers or agents used by us or the selling shareholders in any offering of securities under this prospectus may be customers of,
engage in transactions with, and perform services for us or affiliates of ours in the ordinary course of business. Underwriters,
dealers, agents and other persons may be entitled to indemnification against and contribution toward certain civil liabilities,
including liabilities under the Securities Act, and to be reimbursed for certain expenses.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Subject to any
restrictions relating to debt securities in bearer form, any securities initially sold outside the United States may be resold
in the United States through underwriters, dealers or otherwise.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">&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-indent: 0.5in; background-color: white">Any underwriters
to which offered securities are sold by us or the selling shareholders for public offering and sale may make a market in such securities,
but those underwriters will not be obligated to do so and may discontinue any market making at any time.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">The anticipated
date of delivery of the securities offered by this prospectus will be described in the applicable prospectus supplement relating
to the offering.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">The selling shareholders
and any broker-dealer participating in the distribution of the shares of common stock may be deemed to be an &ldquo;underwriter&rdquo;
within the meaning of the Securities Act with respect to any securities such entity sells pursuant to this prospectus.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">To comply with
the securities laws of some states, if applicable, the securities may be sold in these jurisdictions only through registered or
licensed brokers or dealers. In addition, in some states the securities may not be sold unless they have been registered or qualified
for sale or an exemption from registration or qualification requirements is available and is complied with.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">There can be no assurance that we or the
selling shareholders will sell all or any of the securities offered by this prospectus.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="p1_010"></A>LEGAL MATTERS</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Richardson &amp; Patel, LLP, with an office
at The Chrysler Building, 405 Lexington Avenue, 49th Floor, New York, New York 10174, will pass upon the validity of the securities
offered in this prospectus. As of May 6, 2013, Richardson &amp; Patel, LLP and its principals or entities controlled by its principals
own 166,495 shares of our common stock, a portion of which it accepted as payment for certain legal services rendered to us. Although
Richardson &amp; Patel, LLP is not under any obligation to accept shares of our common stock in payment for services, it may do
so in the future.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="p1_011"></A>EXPERTS</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Gumbiner Savett Inc., independent registered
public accounting firm, has audited our&nbsp;financial statements included in our Annual Report on Form 10-K for the year ended
December&nbsp;31, 2012, as set forth in their report, which is incorporated by reference in the prospectus and elsewhere in this
registration statement. Our financial statements are incorporated by reference in reliance on the report of Gumbiner Savett Inc.,
given on their authority as experts in accounting and auditing.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="p1_012"></A>WHERE YOU CAN FIND MORE INFORMATION</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We have filed with the SEC a registration
statement on Form S-3 under the Securities Act with respect to the securities covered by this prospectus. This prospectus, which
is a part of the registration statement, does not contain all of the information set forth in the registration statement or the
exhibits and schedules filed therewith. For further information with respect to us and the securities covered by this prospectus,
please see the registration statement and the exhibits filed with the registration statement. A copy of the registration statement
and the exhibits filed with the registration statement may be inspected without charge at the Public Reference Room maintained
by the SEC, located at 100&nbsp;F&nbsp;Street, N.E., Washington,&nbsp;D.C. 20549. Please call the SEC at 1-800-SEC-0330 for more
information about the operation of the Public Reference Room. The SEC also maintains an Internet website that contains reports,
proxy and information statements and other information regarding registrants that file electronically with the SEC. The address
of the website is http://www.sec.gov.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">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 Public
Reference Room and website of the SEC referred to above. We maintain a website at http://www.unipixel.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&nbsp;13(a) or 15(d) 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; text-indent: 0.5in">&nbsp;</P>


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="p1_013"></A>INFORMATION INCORPORATED BY REFERENCE</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The SEC and applicable law permits us to
&ldquo;incorporate by reference&rdquo; into this prospectus information that we have or may in the future file with or furnish
to the SEC. This means that we can disclose important information by referring you to those documents. You should read carefully
the information incorporated herein by reference because it is an important part of this prospectus. We hereby incorporate by reference
the following documents into this prospectus:</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">Our Annual Report on Form 10-K for the fiscal year ended December
31, 2012, as filed with the SEC on February 22, 2013;</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">All information in our proxy statement filed with the SEC on March
27, 2013 to the extent incorporated by reference in our Annual Report on Form 10-K for the year ended December 31, 2012;</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">Our Quarterly Report on Form 10-Q for the period ended March 31, 2013,
as filed with the SEC on May 6, 2013; and</FONT></TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">Our Current Reports on Form 8-K filed with the SEC on January 18,
2013 and January 22, 2013.</FONT></TD></TR></TABLE>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Additionally, all documents filed by us
with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act, after the date of this prospectus and before the termination
or completion of this offering shall be deemed to be incorporated by reference into this prospectus from the respective dates of
filing of such documents. Any information that we subsequently file with the SEC that is incorporated by reference as described
above will automatically update and supersede any previous information that is part of this prospectus.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Upon written or oral request, we will provide
you without charge, a copy of any or all of the documents incorporated by reference, other than exhibits to those documents unless
the exhibits are specifically incorporated by reference in the documents. Please send requests to ClearSign Combustion Corporation,
12870 Interurban Avenue South, Seattle, Washington 98168, Attn: Chief Financial Officer, Telephone: (206) 673-4848.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="text-transform: uppercase"><B><A NAME="p1_014"></A>DISCLOSURE
OF COMMISSION POSITION ON INDEMNIFICATION</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="text-transform: uppercase"><B>FOR
SECURITIES ACT LIABILITIES</B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Insofar as indemnification for liabilities
arising under the Securities Act of 1933 may be permitted to directors, officers or persons controlling the company, we have been
informed 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.</P>

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


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

















































<HR SIZE="1" NOSHADE ALIGN="LEFT" STYLE="width: 100%; color: black">

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center; background-color: white"><IMG SRC="tlogo.jpg" ALT=""></P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; background-color: white"><B>2,600,000 Shares</B></P>

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

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

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

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

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

<HR SIZE="1" NOSHADE ALIGN="CENTER" STYLE="width: 12%; color: black">

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

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

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

<HR SIZE="1" NOSHADE ALIGN="CENTER" STYLE="width: 12%; color: black">

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; background-color: white"><B>MDB CAPITAL
GROUP, LLC</B></P>

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

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

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

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; background-color: white">February 5, 2015</P>

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`
end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
