<SEC-DOCUMENT>0001144204-12-061037.txt : 20121113
<SEC-HEADER>0001144204-12-061037.hdr.sgml : 20121112
<ACCEPTANCE-DATETIME>20121109190651
ACCESSION NUMBER:		0001144204-12-061037
CONFORMED SUBMISSION TYPE:	S-8
PUBLIC DOCUMENT COUNT:		9
FILED AS OF DATE:		20121113
DATE AS OF CHANGE:		20121109
EFFECTIVENESS DATE:		20121113

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:		S-8
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-184884
		FILM NUMBER:		121195075

	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>S-8
<SEQUENCE>1
<FILENAME>v328019_s8.htm
<DESCRIPTION>FORM S-8
<TEXT>
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<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-top: 0pt; margin-bottom: 0pt; text-align: center"><B>As filed with the
Securities and Exchange Commission on November 9, 2012</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right; text-indent: 0.5in"><B>Registration No. 333-</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-top: 0pt; margin-bottom: 0pt; text-align: center"><B>UNITED STATES</B></P>

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

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

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

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

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0.5in"></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-top: 0pt; margin-bottom: 0pt; text-align: center"><B>FORM S-8</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-top: 0pt; margin-bottom: 0pt; text-align: center"><B>REGISTRATION STATEMENT
UNDER THE SECURITIES ACT OF 1933</B></P>

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

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

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<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>
    <TD STYLE="width: 8%; text-indent: 0.5in">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 84%; border-bottom: windowtext 1pt solid; font-weight: bold; text-align: center"><B>ClearSign Combustion Corporation</B></TD>
    <TD STYLE="width: 8%; text-indent: 0.5in">&nbsp;</TD></TR>
<TR>
    <TD STYLE="text-indent: 0.5in">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; text-align: center">(Exact name of registrant as specified in its charter)</TD>
    <TD STYLE="text-indent: 0.5in">&nbsp;</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>
    <TD STYLE="width: 13%; text-indent: 0.5in">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 34%; border-bottom: black 1pt solid; font-weight: bold; text-align: center"><B>Washington</B></TD>
    <TD STYLE="vertical-align: bottom; width: 8%; text-indent: 0.5in">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 32%; border-bottom: black 1pt solid; font-weight: bold; text-align: center"><B>26-2056298</B></TD>
    <TD STYLE="width: 13%; text-indent: 0.5in">&nbsp;</TD></TR>
<TR>
    <TD STYLE="text-indent: 0.5in">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in">(State or other jurisdiction
        of</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">incorporation or organization)</P></TD>
    <TD STYLE="vertical-align: bottom; text-indent: 0.5in">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">(IRS Employer</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">Identification No.)</P></TD>
    <TD STYLE="text-indent: 0.5in">&nbsp;</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: bottom">
    <TD STYLE="width: 50%; border-bottom: black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>12870 Interurban Avenue
        South</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Seattle, Washington</B></P></TD>
    <TD STYLE="width: 8%; text-align: center">&nbsp;</TD>
    <TD STYLE="width: 42%; border-bottom: black 1pt solid; font-weight: bold; text-align: center"><B>98168</B></TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="text-align: center">(Address of principal executive offices)</TD>
    <TD STYLE="text-indent: 0.5in">&nbsp;</TD>
    <TD STYLE="text-align: center">(Zip Code)</TD></TR>
</TABLE> <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; 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; text-indent: 0.5in"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>ClearSign Combustion
Corporation 2011 Equity Incentive Plan</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Warrant Issued to
Robert Breidenthal</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Warrant Issued to
John Kramlich</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Warrant Issued to
Uri Shumlak</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Warrant Issued to
Tim Londergan</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Warrant Issued to
Tracy Prevo</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">(Full title of the plan)</P>

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

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">12870 Interurban Avenue
South</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">Seattle, Washington
98168</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; 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; text-indent: 0.5in"></P> <P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">(Name
and address of agent for service)</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-top: 0pt; margin-bottom: 0pt; text-align: center">(206) 673-4848</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; text-indent: 0.5in"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">(Telephone number,
including area code, of agent for service)</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">Indicate by check mark whether the registrant
is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of &ldquo;accelerated filer,&rdquo;
and &ldquo;large accelerated filer&rdquo; and &ldquo;smaller reporting company&rdquo; in Rule&nbsp;12b-2 of the Exchange Act. (Check
one):</P>

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

<TABLE ALIGN="CENTER" CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 49%; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif">Large&nbsp;accelerated&nbsp;filer&nbsp;</FONT><FONT STYLE="font-family: Wingdings">o</FONT></TD>
    <TD STYLE="width: 2%; text-indent: 0in">&nbsp;</TD>
    <TD STYLE="width: 49%; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif">Accelerated&nbsp;filer&nbsp;</FONT><FONT STYLE="font-family: Wingdings">o</FONT></TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif">Non-accelerated&nbsp;filer&nbsp;</FONT><FONT STYLE="font-family: Wingdings">o</FONT></TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif">Smaller&nbsp;reporting&nbsp;company&nbsp;</FONT><FONT STYLE="font-family: Wingdings">x</FONT></TD></TR>
<TR>
    <TD STYLE="vertical-align: top; text-align: center">(Do not check if a smaller reporting company)</TD>
    <TD STYLE="vertical-align: bottom; text-indent: 0.5in">&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-indent: 0.5in; text-align: center">&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B>&nbsp;</B></P>

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<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; text-indent: 0"><B>CALCULATION OF REGISTRATION
FEE</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; 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">
    <TD STYLE="font-weight: bold; border-bottom: Black 1pt solid">Title&nbsp;of<BR> Securities&nbsp;to&nbsp;be<BR> Registered</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; border-bottom: Black 1pt solid">Amount&nbsp;to&nbsp;be<BR> Registered&nbsp;(1)</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; border-bottom: Black 1pt solid">Proposed<BR> Maximum<BR> Offering<BR> Price&nbsp;Per<BR> Share&nbsp;(2)</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; border-bottom: Black 1pt solid">Proposed<BR> Maximum<BR> Aggregate<BR> Offering&nbsp;<BR> Price</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-weight: bold; border-bottom: Black 1pt solid">Amount&nbsp;of<BR> Registration<BR> Fee</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="width: 48%; text-indent: 0in">Common Stock, $0.001 par value</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; text-align: right">985,434</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 10%; text-align: right">5.31</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 10%; text-align: right">5,232,655</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 10%; text-align: right">713.73</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; text-indent: 0in">Common Stock, $0.001 par value underlying warrants</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">80,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">1.80</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">144,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">19.64</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="font-weight: bold; text-indent: 0in; padding-left: 0.12in">Total</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">1,065,434</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">&nbsp;</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">$</TD><TD STYLE="font-weight: bold; text-align: right">5,376,655</TD><TD STYLE="font-weight: bold; text-align: left">&nbsp;</TD><TD STYLE="font-weight: bold">&nbsp;</TD>
    <TD STYLE="font-weight: bold; text-align: left">$</TD><TD STYLE="font-weight: bold; text-align: right">0.00</TD><TD STYLE="font-weight: bold; text-align: left">(3)</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">(1) Pursuant to Rule 416(a) under the Securities
Act of 1933, as amended, this registration statement shall also cover such indeterminate number of additional shares of the registrant&rsquo;s
common stock that become issuable by reason of any stock dividend, stock split, recapitalization or other similar transaction that
increases the number of the registrant&rsquo;s outstanding shares to be offered pursuant to the applicable plan described herein.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">(2) Estimated solely for purposes of calculating
the registration fee in accordance with Rule 457(c) and (h)(1) of the Securities Act of 1933, as amended, based on the average
of the high and low prices for the registrant&rsquo;s common stock as reported on The Nasdaq Capital Market on November 8, 2012.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">(3) Pursuant to Rule 457(p) under the Securities
Act of 1933, as amended, the Registrant is off-setting the amount of the filing fee due hereunder from the filing fee of $3,365.02
originally paid on November 14, 2011 in conjunction with the filing of an S-1 registration statement, file no. 333-177946. The
filing fee was subsequently reduced to $1,987.53.</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; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0"><B>PART 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-align: center; text-indent: 0"><B>INFORMATION REQUIRED
IN THE SECTION 10(a) 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">Information required in Part I of Form S-8
to be contained in a prospectus meeting the requirements of Section 10(a) of the Securities Act is not required to be filed with
the Securities and Exchange Commission (the &ldquo;Commission&rdquo;) and is omitted from this Registration Statement in accordance
with the explanatory note to Part I of Form S-8 and Rule&nbsp;428(b)(1) under the Securities Act of 1933, as amended (the &ldquo;Securities
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-align: center; text-indent: 0"><B>PART II</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; text-indent: 0"><B>INFORMATION REQUIRED
IN THE REGISTRATION STATEMENT</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>Item 3. Incorporation of Documents 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 following documents, which have been
filed by ClearSign Combustion Corporation (the &ldquo;Registrant&rdquo;) with the Commission, are incorporated by reference in
this Registration Statement:</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)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
prospectus filed by the Registrant with the Commission on April 25, 2012 which contains audited financial statements for the year
ended December 31, 2011;</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">(ii)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Registrant&rsquo;s Quarterly Reports on Form 10-Q for each of the quarters ended March 31, 2012, as filed with the Commission on
June 11, 2012, June 30, 2012, as filed with the Commission on August 6, 2012 and September 30, 2012, as filed with the Commission
on November 8, 2012;</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">(iii)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Registrant&rsquo;s Current Reports on Form 8-K as filed with the Commission on April 25, 2012, April 30, 2012, May 15, 2012, June
19, 2012 and June 28, 2012;</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">(iv)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All
other reports filed by the Registrant pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; 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; text-indent: 0.5in">(v)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
description of the Registrant's common stock included in the Form 8-A filed with the Commission on April 23, 2012.</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">All documents subsequently filed by the
Registrant pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Securities Exchange Act of 1934 shall be deemed to be incorporated
by reference in this Registration Statement and to be a part thereof from the date of filing such documents.</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>Item 4. Description of Securities.</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">Not applicable.</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>Item 5. Interests of Named Experts and
Counsel.</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"><FONT STYLE="font-family: Times New Roman, Times, Serif">Richardson
&amp; Patel LLP has rendered an opinion relating to the issuance of the common stock being registered. Richardson &amp; Patel LLP
and its principals have accepted shares of the Registrant&rsquo;s common stock in exchange for services rendered to the Registrant
in the past and, although the law firm and its principals are under no obligation to do so, they may continue to accept</FONT>
<FONT STYLE="font-family: Times New Roman, Times, Serif">the Registrant&rsquo;s common stock for services rendered by them. As
of the date of this registration statement, Richardson &amp; Patel LLP and its principals collectively own 385,866 shares of the
Registrant&rsquo;s common stock.</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; text-indent: 0.5in"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B>Item 6. Indemnification of Directors
and Officers.</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 summary is qualified in its
entirety by reference to the complete text of any statutes referred to below and the amended Articles of Incorporation of the Registrant.</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 Registrant&rsquo;s Articles of Incorporation
provide that, to the fullest extent permitted by Washington law, the Registrant&rsquo;s directors will not be liable to the Registrant
or its shareholders for monetary damages. This provision, however, does not eliminate or limit liability for acts or omissions
that involve intentional misconduct or a knowing violation of law by a director, for conduct violating Revised Code of Washington
section 23B.08.310 (approval of an unlawful distribution) or for any transaction from which the director will personally receive
a benefit in money, property, or services to which the director is not legally entitled. Pursuant to section 23B.08.52 of the Revised
Code of Washington, because the Registrant&rsquo;s Articles of Incorporation do not limit the obligation, the Registrant must indemnify
a director who was wholly successful, on the merits or otherwise, in the defense of any proceeding to which the director was a
party because of being a director against reasonable expenses incurred by the director in connection with the proceeding.</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 Registrant&rsquo;s Bylaws further provide
that each person who was, is or is threatened to be made a party to or is otherwise involved in any threatened, pending or completed
action, suit, claim or proceeding, whether civil, criminal, administrative or investigative and whether formal or informal, by
reason of the fact that he or she is or was a director or officer of the Registrant or was serving at the Registrant&rsquo;s request
as a director, officer, partner, trustee, employee or agent of another entity, shall be indemnified and held harmless against all
losses, claims, damages, liabilities and expenses actually and reasonably incurred or suffered in connection with the proceeding.
This indemnification right continues even after the individual has ceased to be a director or officer or to serve at the Registrant&rsquo;s
request as a director, officer, partner, trustee, employee or agent of another entity. However, if the person indemnified initiates
the proceeding, he or she shall be entitled to indemnification only if the proceeding was authorized or ratified by the Registrant&rsquo;s
board of directors. No indemnification will be provided for acts or omissions finally adjudged to be intentional misconduct or
a knowing violation of law, for conduct finally adjudged to be in violation of Revised Code of Washington section 23B.08.310, for
any transaction with respect to which it was finally adjudged that the indemnitee personally received a benefit in money, property
or services to which the indemnitee was not legally entitled or if the Registrant is otherwise prohibited by applicable law from
paying indemnification. The Registrant must advance expenses to an indemnitee for an indemnification obligation so long as the
Registrant receives an undertaking by or on behalf of the indemnitee to repay all amounts so advanced if it is determined by a
final judicial decision from which there is no further right to appeal that the indemnitee is not entitled to be indemnified.</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">Under the Registrant's Director and Officer
Insurance Policy, directors and officers are provided liability coverage of $5 million subject to retention. The policy has a one
year term with annual renewal possible. The policy can be terminated by the insured if there is a merger or acquisition which includes
a change in ownership of 50% of the voting shares. Upon such an occurrence the insurer may elect to cancel the policy. The Registrant
may elect to then obtain &ldquo;run off&rdquo; insurance for a period of between one and six years at a cost of between 125% and
225% of the initial policy premium. The policy is a claim made policy. It covers only those claims made during the policy term.
If an act giving rise to a claim occurs during the policy term, but the claim is not reported within 60 days of the termination
or expiration policy, the claim will not be covered.</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"><FONT STYLE="background-color: white">The
Registrant has entered into, and will enter into in the future, indemnification agreements with the individuals who serve as its
officers and directors. Pursuant to these agreements, the Registrant will indemnify officers and directors who are made parties
to, or threatened to be made parties to, any proceeding by reason of the fact that they are or were officers or directors, or are
or were serving at the Registrant's request as a director, officer, employee, or agent of another entity. The agreements require
the Registrant to indemnify its officers and directors against all expenses, judgments, fines and penalties actually and reasonably
incurred by them in connection with the defense or settlement of any such proceeding, subject to the terms and conditions of the
agreements.</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; text-indent: 0.5in"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B>Item 7. Exemption from Registration Claimed.</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">Not applicable.</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>Item 8. Exhibits.</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>
    <TD STYLE="vertical-align: bottom; width: 13%; border-bottom: windowtext 1pt solid; text-indent: 0in; font-weight: bold; text-align: center">Exhibit&nbsp;No.</TD>
    <TD STYLE="vertical-align: top; width: 2%; padding-bottom: 1pt; text-indent: 0in; font-weight: bold; text-align: center">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom; width: 85%; border-bottom: windowtext 1pt solid; text-indent: 0in; font-weight: bold; text-align: center">Description&nbsp;of&nbsp;Exhibit</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">3.1</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Articles of Incorporation (1)</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">3.2</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Bylaws (1)</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">5.</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Opinion of Richardson &amp; Patel LLP*</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">10.1</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">ClearSign Combustion Corporation 2011 Equity Incentive Plan (1)</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">10.2</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Warrant Agreement Issued to Robert Breidenthal*</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">10.3</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Warrant Agreement Issued to John Kramlich*</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">10.4</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Warrant Agreement Issued to Uri Shumlak*</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">10.5</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Warrant Agreement Issued to Tim Londergan*</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">10.6</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Warrant Agreement Issued to Tracey Prevo*</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">23.1</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Consent of Gumbiner Savett Inc.*</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">23.2</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Consent of Richardson &amp; Patel LLP (included in Exhibit 5)</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">* Filed herewith.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">(1) Incorporated by reference from the Registrant's
S-1 registration statement, as amended, originally filed with the Securities and Exchange Commission on November 14, 2011.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B>Item 9. Undertakings.</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 undersigned registrant hereby undertakes:</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. (1) To file, during any period in which
offers or sales are being made, a post-effective amendment to this registration statement to <FONT STYLE="color: black">include
any material information with respect to the plan of distribution not previously disclosed in the registration statement or any
material change to such information in the registration statement; (2) that for the purpose of determining any liability under
the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement relating to the
securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering
thereof; and (3) to remove from registration by means of a post-effective amendment any of the securities being registered which
remain unsold at the termination of the offering.</FONT></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. The undersigned Registrant hereby undertakes
that, for purposes of determining any liability under the Securities Act, each filing of the Registrant&rsquo;s annual report pursuant
to Section 13(a) or 15(d) of the Exchange Act (and, where applicable, each filing of an employee benefit plan&rsquo;s annual report
pursuant to Section 15(d) of the Exchange Act) that is incorporated by reference in this Registration Statement shall be deemed
to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time
shall be deemed to be the initial bona fide offering thereof.</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">C. Insofar as indemnification for liabilities
arising under the Securities Act may be permitted to directors, officers and controlling persons of the Registrant pursuant to
the foregoing provisions, or otherwise, the Registrant has been advised that in the opinion of the Commission such indemnification
is against public policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or
controlling person in connection with the securities being registered, the Registrant will, unless in the opinion of its counsel
the matter has been settled by a controlling precedent, submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication
of such issue.</P>

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

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    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 12pt"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif"><TR><TD STYLE="text-align: center; width: 100%">&nbsp;</TD></TR></TABLE></DIV>
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<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; text-indent: 0"><B>SIGNATURES</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">Pursuant to the requirements of the Securities
Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing
on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized,
in the City of Irvine, State of California on the 9th day of November, 2012.</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: top">
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-indent: 0in">ClearSign Combustion Corporation</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%; text-indent: 0in">&nbsp;</TD>
    <TD STYLE="width: 4%; text-indent: 0in">&nbsp;</TD>
    <TD STYLE="width: 46%; text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="text-indent: 0in; padding-bottom: 1pt">By:</TD>
    <TD STYLE="text-indent: 0in; text-decoration: none; border-bottom: Black 1pt solid">/s/ Richard Rutkowski</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Richard F. Rutkowski, Chief Executive Officer</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">By:</TD>
    <TD STYLE="text-indent: 0in; text-decoration: none; border-bottom: Black 1pt solid">/s/ James N. Harmon</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">James N. Harmon, Chief Financial Officer</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 accordance with the requirements of the
Securities Act of 1933, as amended, this registration statement was signed by the following persons in the capacities and on the
dates stated:</P>

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: windowtext 1pt solid; text-indent: 0in; text-align: center; width: 26%">Signature</TD>
    <TD STYLE="text-indent: 0in; text-align: center; width: 2%">&nbsp;</TD>
    <TD STYLE="border-bottom: windowtext 1pt solid; text-indent: 0in; text-align: center; width: 45%">Title</TD>
    <TD STYLE="text-indent: 0in; text-align: center; width: 2%">&nbsp;</TD>
    <TD STYLE="border-bottom: windowtext 1pt solid; text-indent: 0in; text-align: center; width: 25%">Date</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-decoration: none; border-bottom: Black 1pt solid">/s/Richard F. Rutkowski</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Richard F. Rutkowski, Chief Executive Officer</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">November 9, 2012</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">and Director</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-decoration: none; border-bottom: Black 1pt solid">/s/ James N. Harmon</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">James N. Harmon, Chief Financial&nbsp; Officer</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">November 9, 2012</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-decoration: none; border-bottom: Black 1pt solid">/s/ David B. Goodson</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">David B. Goodson, Director</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">November 9, 2012</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-decoration: none; border-bottom: Black 1pt solid">/s/ Stephen E. Pirnat</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Stephen E. Pirnat, Director</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">November 9, 2012</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-decoration: none; border-bottom: Black 1pt solid">/s/ Scott P. Issacson</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Scott P. Issacson, Director</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">November 9, 2012</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-decoration: none; border-bottom: Black 1pt solid">/s/ Lon E. Bell</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Lon E. Bell, Director</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">November 9, 2012</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; text-indent: 0.5in">&nbsp;</P>

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 13%; border-bottom: windowtext 1pt solid; text-indent: 0in; font-weight: bold; text-align: center">Exhibit No.</TD>
    <TD STYLE="width: 2%; text-indent: 0in; font-weight: bold; text-align: center">&nbsp;</TD>
    <TD STYLE="width: 85%; border-bottom: windowtext 1pt solid; text-indent: 0in; font-weight: bold; text-align: center">Description of Exhibit</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">3.1</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Articles of Incorporation (1)</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">3.2</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Bylaws (1)</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">5.</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Opinion of Richardson &amp; Patel LLP*</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">10.1</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">ClearSign Combustion Corporation 2011 Equity Incentive Plan (1)</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">10.2</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Warrant Agreement Issued to Robert Breidenthal*</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">10.3</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Warrant Agreement Issued to John Kramlich*</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">10.4</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Warrant Agreement Issued to Uri Shumlak*</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">10.5</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Warrant Agreement Issued to Tim Londergan*</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">10.6</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Warrant Agreement Issued to Tracey Prevo*</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">23.1</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Consent of Gumbiner Savett Inc.*</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; text-align: center">23.2</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">Consent of Richardson &amp; Patel LLP (included in Exhibit 5)</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">* Filed herewith.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">(1) Incorporated by reference from the Registrant's
S-1 registration statement, as amended, originally filed with the Securities and Exchange Commission on November 14, 2011.</P>

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

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<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>v328019_ex5-1.htm
<DESCRIPTION>EXHIBIT 5.1
<TEXT>
<HTML>
<HEAD>
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<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<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-align: right; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right; text-indent: 0.5in">Exhibit 5.1</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; text-indent: 0in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif; color: black"><B>RICHARDSON
&amp; PATEL LLP</B></FONT><BR>
<FONT STYLE="font: 10pt Times New Roman, Times, Serif; color: black"><B>1100 Glendon Avenue</B></FONT><BR>
<FONT STYLE="font: 10pt Times New Roman, Times, Serif; color: black"><B>Eighth Floor</B></FONT><BR>
<FONT STYLE="font: 10pt Times New Roman, Times, Serif; color: black"><B>Los Angeles, California 90024</B></FONT><BR>
<FONT STYLE="font: 10pt Times New Roman, Times, Serif; color: black"><B>Telephone (310) 208-1182</B></FONT><BR>
<FONT STYLE="font: 10pt Times New Roman, Times, Serif; color: black"><B>Facsimile (310) 208-1154</B> </FONT></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; text-indent: 0in">November 9, 2012</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">ClearSign Combustion Corporation</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">12870 Interurban Avenue South</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Seattle, Washington 98168</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="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 6pt"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.5in; text-align: left"><B>Re:</B></TD><TD STYLE="text-align: justify"><B><U>1,065,434 Shares of Common Stock Registered on
Form S-8</U></B></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">Gentlemen:</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 acted as counsel to ClearSign Combustion
Corporation, a Washington corporation (the &ldquo;Company&rdquo;), in connection with the preparation of and the filing with the
Securities and Exchange Commission under the Securities Act of 1933 of the Company&rsquo;s Registration Statement on Form S-8 relating
to 985,434 shares of the Company&rsquo;s common stock (the &ldquo;Plan Shares&rdquo;) which are reserved for issuance from the
ClearSign Combustion Corporation 2011 Equity Incentive Plan and 80,000 shares of the Company's common stock underlying warrants
(the &quot;Warrants&quot;) issued for compensation (the &quot;Warrant Shares&quot;).</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 connection with that registration, we
have reviewed the proceedings of the Board of Directors of the Company relating to the registration and proposed issuance of the
Plan Shares and the Warrant Shares, the Articles of Incorporation of the Company and all amendments thereto, the Bylaws of the
Company and all amendments thereto, and such other documents and matters as we have deemed necessary to the rendering of the following
opinion.</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 upon the foregoing, we are of the
opinion that (i) the Plan Shares issuable by the Company pursuant to the Registration Statement, including the Plan Shares that
will be issued upon exercise of the options, and (ii) the Warrant Shares to be issued upon exercise of the Warrants, will be validly
issued, fully paid and nonassessable. <FONT STYLE="color: black"> We do not find it necessary for the purposes of this opinion
to cover, and accordingly we express no opinion as to, the application of the securities or blue sky laws of the various states
of the United States to the issuance and sale of the Shares.</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">We consent to the use of this opinion in
the registration statement filed with the Securities and Exchange Commission in connection with the registration of the Shares.</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: top">
    <TD STYLE="width: 50%; text-indent: 0in">&nbsp;</TD>
    <TD STYLE="width: 50%; text-indent: 0in">/s/Richardson &amp; Patel LLP</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD STYLE="text-indent: 0in; font-weight: bold">RICHARDSON &amp; PATEL LLP</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0in">&nbsp;</P>

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<DOCUMENT>
<TYPE>EX-10.2
<SEQUENCE>3
<FILENAME>v328019_ex10-2.htm
<DESCRIPTION>EXHIBIT 10.2
<TEXT>
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<P STYLE="margin: 0"></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left">THE SECURITIES REPRESENTED BY THIS CERTIFICATE
HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW
TO, OR IN CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF. NO SUCH SALE OR DISPOSITION MAY BE EFFECTED WITHOUT AN EFFECTIVE REGISTRATION
STATEMENT RELATED THERETO OR AN OPINION OF COUNSEL FOR THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES
ACT OF 1933, AS AMENDED.</P>

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%; font-size: 10pt; text-align: justify">Warrant No. A-1</TD>
    <TD STYLE="width: 50%; font-size: 10pt; text-align: right">Date of Issuance:&nbsp; February 16, 2011</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>CLEARSIGN COMBUSTION CORPORATION</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-align: center"><B><U>Common Stock Purchase Warrant</U></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">ClearSign Combustion Corporation (the &ldquo;Company&rdquo;),
for value received, hereby certifies that Dr. Robert Breidenthal (the &ldquo;Registered Holder&rdquo;) is entitled, subject to
the terms set forth below, to purchase from the Company on or after the date that this Common Stock Purchase Warrant (the &ldquo;Warrant&rdquo;)
is issued (the &ldquo;Exercise Date&rdquo;), up to 20,000 shares of the Company&rsquo;s Common Stock at a purchase price of $2.25
per share. The right of the Registered Holder to purchase the Common Stock shall terminate at 5:00 p.m. Pacific time on February
16, 2021 (the &ldquo;Termination Date&rdquo;). The shares purchasable upon exercise of this Warrant, and the purchase price per
share, each as adjusted from time to time pursuant to the provisions of this Warrant, are hereinafter referred to as the &ldquo;Warrant
Stock&rdquo; and the &ldquo;Purchase Price,&rdquo; respectively.</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: justify; text-indent: 0.5in"><B>1.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Exercise</U>.</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This
Warrant may be exercised by the Registered Holder at any time after the Exercise Date, in whole or in part, by surrendering this
Warrant, with the purchase form appended hereto as <U>Exhibit A</U> duly executed by the Registered Holder, at the principal office
of the Company or at such other office or agency as the Company may designate, accompanied by payment in full by cashier&rsquo;s
check, money order or wire transfer of the Purchase Price payable in respect of the number of shares of Warrant Stock purchased
upon such exercise.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each
exercise of this Warrant shall be deemed to have been effected immediately prior to the close of business on the day on which this
Warrant shall have been surrendered to the Company as provided in Section 1(a) above. At such time, the Registered Holder shall
be deemed to have become the holder of record of the Warrant Stock represented by such certificates.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Upon
exercise of this Warrant the Company, or the Company&rsquo;s agent, shall deliver to the Registered Holder a certificate for the
number of shares of Warrant Stock to which such Registered Holder shall be entitled.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in"><B>2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Adjustments</U>.</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If
outstanding shares of the Company&rsquo;s Common Stock shall be subdivided into a greater number of shares or a dividend in Common
Stock shall be paid in respect of Common Stock, the Purchase Price in effect immediately prior to such subdivision or at the record
date of such dividend shall simultaneously with the effectiveness of such subdivision or immediately after the record date of such
dividend be proportionately reduced. If outstanding shares of Common Stock shall be combined into a smaller number of shares, the
Purchase Price in effect immediately prior to such combination shall, simultaneously with the effectiveness of such combination,
be proportionately increased. When any adjustment is required to be made in the Purchase Price, the number of shares of Warrant
Stock purchasable upon the exercise of this Warrant shall be changed to the number determined by dividing (i) an amount equal to
the number of shares issuable upon the exercise of this Warrant immediately prior to such adjustment, multiplied by the Purchase
Price in effect immediately prior to such adjustment, by (ii) the Purchase Price in effect immediately after such adjustment.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In
case of any recapitalization, reclassification or change of the outstanding securities of the Company or of any reorganization
of the Company or any similar corporate reorganization (other than a merger or consolidation with a wholly-owned subsidiary, a
reincorporation of the Company in a different jurisdiction, or other transaction in which there is no substantial change in the
stockholders of the Company or their relative stock holdings) on or after the date hereof (a &ldquo;Restructuring&rdquo;), then
as a condition to such Restructuring, lawful and adequate provisions shall be made so that in each such case the holder of this
Warrant, upon the exercise hereof at any time after the consummation of such reclassification, change or reorganization, shall
be entitled to receive, in lieu of the stock or other securities and property receivable upon the exercise hereof prior to such
consummation, the stock or other securities or property to which such holder would have been entitled upon such consummation if
such holder had exercised this Warrant immediately prior thereto, all subject to further adjustment as provided in paragraph (a);
and in each such case, the terms of this Section 2 shall be applicable to the shares of stock or other securities properly receivable
upon the exercise of this Warrant after such consummation.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&#9;(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;When
any adjustment is required to be made in the Purchase Price or the number of shares of Warrant Stock issuable upon exercise of
this Warrant, the Company shall promptly mail to the Registered Holder in accordance with Section 8 hereof a certificate setting
forth the Purchase Price after such adjustment and setting forth a brief statement of the facts requiring such adjustment. Such
certificate shall also set forth the kind and amount of stock or other securities or property into which this Warrant shall be
exercisable following the occurrence of any of the events specified in this Section 2.</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; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in"><B>3.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Transfers</U>.</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Registered Holder acknowledges that this Warrant and the Warrant Stock have not been registered under the Securities Act, and agrees
not to sell, pledge, distribute, offer for sale, transfer or otherwise dispose of this Warrant or any Warrant Stock issued upon
its exercise in the absence of (i) an effective registration statement under the Securities Act as to this Warrant and such Warrant
Stock and registration or qualification of this Warrant and such Warrant Stock under any applicable &ldquo;blue sky&rdquo; or state
securities law then in effect, or (ii) an opinion of counsel, reasonably satisfactory to the Company, that such registration and
qualification are not required.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Company will maintain a register containing the name and address of the Registered Holder. The Registered Holder may change his
or her address as shown on the warrant register by written notice to the Company requesting such change.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B>4.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Impairment</U>.</B> The Company will not, by amendment of its charter or through reorganization, consolidation, merger, dissolution,
sale of assets or any other voluntary action, avoid or seek to avoid the observance or performance of any of the terms of this
Warrant, but will at all times in good faith assist in the carrying out of all such terms and in the taking of all such action
as may be necessary or appropriate in order to protect the rights of the holder of this Warrant against impairment.</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>5.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Termination</U>.</B>
This Warrant (and the right to purchase securities upon exercise hereof) shall terminate upon the Termination Date.</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>6.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Reservation
of Stock</U>.</B> The Company covenants and agrees that all shares of Warrant Stock that may be issued upon the exercise of the
rights represented by this Warrant will, upon issuance, be duly authorized, validly issued, fully paid and non-assessable. The
Company will at all times reserve and keep available, solely for the issuance and delivery upon the exercise of this Warrant, such
shares of Warrant Stock and other stock, securities and property, as from time to time shall be issuable upon the exercise of this
Warrant. The Company will take all such action as may be necessary to assure that such shares of Warrant Stock may be issued as
provided herein without violation of any applicable law or regulation, or of any requirements of any domestic securities exchange
or quotation system upon which the Warrant Stock may be listed or quoted.</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>7.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Replacement
of Warrants</U>.</B> Upon receipt of evidence reasonably satisfactory to the Company of the loss, theft, destruction or mutilation
of this Warrant and (in the case of loss, theft or destruction) upon delivery of a reasonable indemnity agreement (with surety
if reasonably required) in an amount reasonably satisfactory to the Company, or (in the case of mutilation) upon surrender and
cancellation of this Warrant, the Company, at its own expense, will issue, in lieu thereof, a new Warrant of like tenor.</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>8.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Mailing
of Notices</U>.</B> All notices hereunder shall be made in writing to the parties at the addresses listed below or at such other
address as shall be given by mail with postage paid and certified or registered or by facsimile or delivery via courier to the
respective parties. Mailed notices shall be deemed to be delivered three days following the date of such mailing. Facsimile transmissions
shall be deemed to be delivered on the date of the transmission, so long as a receipt confirming that the transmission was successful
is received. Notices delivered by courier shall be deemed to be received on the date of delivery by the courier service. Notices
shall be addressed (a) if to the Registered Holder, to the following address</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; text-indent: 0.5in">&nbsp;&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Dr. Robert Breidenthal</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: 0in">and (b) if to the Company, to the following
address:</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">ClearSign Combustion Corporation</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">12201 Tukwila International Boulevard</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Seattle, Washington 98168</P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B>9.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Rights as Shareholder</U>.</B> Until the exercise of this Warrant, the Registered Holder of this Warrant shall not have or exercise
any rights by virtue hereof as a shareholder 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; text-indent: 0.5in"><B>10.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Fractional Shares</U>.</B> No fractional shares of Common Stock will be issued in connection with any exercise hereunder. In lieu
of any fractional shares which would otherwise be issuable, the Company shall pay an amount equal to the product of such fraction
multiplied by the fair market value of one share of Common Stock on the date of exercise.</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>11.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Amendment
or Waiver</U>. </B>Any term of this Warrant may be amended or waived upon written consent of the Company and the Registered Holder.
Any such waiver of a breach of any provision of this Warrant shall not operate as or be construed to be a waiver of any other breach
of such provision or of any breach of any other provision of this Warrant.</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>12.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Representations
of Holder</U>. </B>The Registered Holder hereby represents and warrants to the Company that: (a) he or she has had access to and
is familiar with information concerning the Company&rsquo;s business, affairs, financial condition, and prospects and (b) he or
she has such knowledge and experience in financial and business matters that he or she is capable of evaluating the merits and
risks of accepting the Warrant.</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>13.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Headings</U>.</B>
The headings in this Warrant are for purposes of reference only and shall not limit or otherwise affect the meaning of any provision
of this Warrant.</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>14.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Governing
Law</U>.</B> This Warrant shall be governed, construed and interpreted in accordance with the laws of the State of Washington,
without giving effect to principles of conflicts of law.</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>15.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Assignment</U>.</B> This Warrant is not assignable or transferable by the Registered Holder.</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; text-indent: 0.5in">&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%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-indent: 0in; font-weight: bold">CLEARSIGN COMBUSTION CORPORATION</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-indent: 0in">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%; text-align: justify; padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="width: 4%; text-align: justify; padding-bottom: 1pt">By:</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: justify; width: 46%">/s/ Richard Rutkowski</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: justify">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: justify">Name:&nbsp; Richard Rutkowski, Chief Executive Officer</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B></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-align: center"><B><U>EXHIBIT A</U></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-align: center"><B><U>PURCHASE FORM</U></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="vertical-align: top">
    <TD STYLE="width: 7%">To:</TD>
    <TD STYLE="width: 69%; font-weight: bold">ClearSign Combustion Corporation</TD>
    <TD STYLE="width: 24%">Dated:</TD></TR>
</TABLE>
<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: 0.5in">The undersigned, pursuant to the provisions
set forth in the attached Warrant, hereby irrevocably elects to purchase _________________ shares of the Common Stock covered by
Warrant Number A-1 and herewith makes payment of $_____________, representing the full purchase price for such shares at the price
per share provided for in such Warrant.</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: top">
    <TD STYLE="width: 49%">&nbsp;</TD>
    <TD STYLE="width: 11%">Signature:</TD>
    <TD STYLE="width: 40%; border-bottom: windowtext 1pt solid">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>Address:</TD>
    <TD STYLE="border-bottom: windowtext 1pt solid; text-decoration: underline"></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<DOCUMENT>
<TYPE>EX-10.3
<SEQUENCE>4
<FILENAME>v328019_ex10-3.htm
<DESCRIPTION>EXHIBIT 10.3
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
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<P STYLE="margin: 0">&nbsp;</P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left">THE SECURITIES REPRESENTED BY THIS CERTIFICATE
HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW
TO, OR IN CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF. NO SUCH SALE OR DISPOSITION MAY BE EFFECTED WITHOUT AN EFFECTIVE REGISTRATION
STATEMENT RELATED THERETO OR AN OPINION OF COUNSEL FOR THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES
ACT OF 1933, AS AMENDED.</P>

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%; font-size: 10pt; text-align: justify">Warrant No. A-2</TD>
    <TD STYLE="width: 50%; font-size: 10pt; text-align: right">Date of Issuance:&nbsp; February 16, 2011</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;<B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>CLEARSIGN COMBUSTION CORPORATION</B></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><U>Common Stock Purchase Warrant</U></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">ClearSign Combustion Corporation (the &ldquo;Company&rdquo;),
for value received, hereby certifies that Dr. John Kramlich (the &ldquo;Registered Holder&rdquo;) is entitled, subject to the terms
set forth below, to purchase from the Company on or after the date that this Common Stock Purchase Warrant (the &ldquo;Warrant&rdquo;)
is issued (the &ldquo;Exercise Date&rdquo;), up to 4,000 shares of the Company&rsquo;s Common Stock at a purchase price of $2.25
per share. The right of the Registered Holder to purchase the Common Stock shall terminate at 5:00 p.m. Pacific time on February
16, 2021 (the &ldquo;Termination Date&rdquo;). The shares purchasable upon exercise of this Warrant, and the purchase price per
share, each as adjusted from time to time pursuant to the provisions of this Warrant, are hereinafter referred to as the &ldquo;Warrant
Stock&rdquo; and the &ldquo;Purchase Price,&rdquo; respectively.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in"><B>1.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Exercise</U>.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This
Warrant may be exercised by the Registered Holder at any time after the Exercise Date, in whole or in part, by surrendering this
Warrant, with the purchase form appended hereto as <U>Exhibit A</U> duly executed by the Registered Holder, at the principal office
of the Company or at such other office or agency as the Company may designate, accompanied by payment in full by cashier&rsquo;s
check, money order or wire transfer of the Purchase Price payable in respect of the number of shares of Warrant Stock purchased
upon such exercise.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each
exercise of this Warrant shall be deemed to have been effected immediately prior to the close of business on the day on which this
Warrant shall have been surrendered to the Company as provided in Section 1(a) above. At such time, the Registered Holder shall
be deemed to have become the holder of record of the Warrant Stock represented by such certificates.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Upon
exercise of this Warrant the Company, or the Company&rsquo;s agent, shall deliver to the Registered Holder a certificate for the
number of shares of Warrant Stock to which such Registered Holder shall be entitled.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in"><B>2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Adjustments</U>.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If
outstanding shares of the Company&rsquo;s Common Stock shall be subdivided into a greater number of shares or a dividend in Common
Stock shall be paid in respect of Common Stock, the Purchase Price in effect immediately prior to such subdivision or at the record
date of such dividend shall simultaneously with the effectiveness of such subdivision or immediately after the record date of such
dividend be proportionately reduced. If outstanding shares of Common Stock shall be combined into a smaller number of shares, the
Purchase Price in effect immediately prior to such combination shall, simultaneously with the effectiveness of such combination,
be proportionately increased. When any adjustment is required to be made in the Purchase Price, the number of shares of Warrant
Stock purchasable upon the exercise of this Warrant shall be changed to the number determined by dividing (i) an amount equal to
the number of shares issuable upon the exercise of this Warrant immediately prior to such adjustment, multiplied by the Purchase
Price in effect immediately prior to such adjustment, by (ii) the Purchase Price in effect immediately after such adjustment.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In
case of any recapitalization, reclassification or change of the outstanding securities of the Company or of any reorganization
of the Company or any similar corporate reorganization (other than a merger or consolidation with a wholly-owned subsidiary, a
reincorporation of the Company in a different jurisdiction, or other transaction in which there is no substantial change in the
stockholders of the Company or their relative stock holdings) on or after the date hereof (a &ldquo;Restructuring&rdquo;), then
as a condition to such Restructuring, lawful and adequate provisions shall be made so that in each such case the holder of this
Warrant, upon the exercise hereof at any time after the consummation of such reclassification, change or reorganization, shall
be entitled to receive, in lieu of the stock or other securities and property receivable upon the exercise hereof prior to such
consummation, the stock or other securities or property to which such holder would have been entitled upon such consummation if
such holder had exercised this Warrant immediately prior thereto, all subject to further adjustment as provided in paragraph (a);
and in each such case, the terms of this Section 2 shall be applicable to the shares of stock or other securities properly receivable
upon the exercise of this Warrant after such consummation.</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">&#9;(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;When
any adjustment is required to be made in the Purchase Price or the number of shares of Warrant Stock issuable upon exercise of
this Warrant, the Company shall promptly mail to the Registered Holder in accordance with Section 8 hereof a certificate setting
forth the Purchase Price after such adjustment and setting forth a brief statement of the facts requiring such adjustment. Such
certificate shall also set forth the kind and amount of stock or other securities or property into which this Warrant shall be
exercisable following the occurrence of any of the events specified in this Section 2.</P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in"><B>3.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Transfers</U>.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Registered Holder acknowledges that this Warrant and the Warrant Stock have not been registered under the Securities Act, and agrees
not to sell, pledge, distribute, offer for sale, transfer or otherwise dispose of this Warrant or any Warrant Stock issued upon
its exercise in the absence of (i) an effective registration statement under the Securities Act as to this Warrant and such Warrant
Stock and registration or qualification of this Warrant and such Warrant Stock under any applicable &ldquo;blue sky&rdquo; or state
securities law then in effect, or (ii) an opinion of counsel, reasonably satisfactory to the Company, that such registration and
qualification are not required.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Company will maintain a register containing the name and address of the Registered Holder. The Registered Holder may change his
or her address as shown on the warrant register by written notice to the Company requesting such change.</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-indent: 0.5in"><B>4.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Impairment</U>.</B> The Company will not, by amendment of its charter or through reorganization, consolidation, merger, dissolution,
sale of assets or any other voluntary action, avoid or seek to avoid the observance or performance of any of the terms of this
Warrant, but will at all times in good faith assist in the carrying out of all such terms and in the taking of all such action
as may be necessary or appropriate in order to protect the rights of the holder of this Warrant against impairment.</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-indent: 0.5in"><B>5.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Termination</U>.</B>
This Warrant (and the right to purchase securities upon exercise hereof) shall terminate upon the Termination Date.</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-indent: 0.5in"><B>6.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Reservation
of Stock</U>.</B> The Company covenants and agrees that all shares of Warrant Stock that may be issued upon the exercise of the
rights represented by this Warrant will, upon issuance, be duly authorized, validly issued, fully paid and non-assessable. The
Company will at all times reserve and keep available, solely for the issuance and delivery upon the exercise of this Warrant, such
shares of Warrant Stock and other stock, securities and property, as from time to time shall be issuable upon the exercise of this
Warrant. The Company will take all such action as may be necessary to assure that such shares of Warrant Stock may be issued as
provided herein without violation of any applicable law or regulation, or of any requirements of any domestic securities exchange
or quotation system upon which the Warrant Stock may be listed or quoted.</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-indent: 0.5in"><B>7.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Replacement
of Warrants</U>.</B> Upon receipt of evidence reasonably satisfactory to the Company of the loss, theft, destruction or mutilation
of this Warrant and (in the case of loss, theft or destruction) upon delivery of a reasonable indemnity agreement (with surety
if reasonably required) in an amount reasonably satisfactory to the Company, or (in the case of mutilation) upon surrender and
cancellation of this Warrant, the Company, at its own expense, will issue, in lieu thereof, a new Warrant of like tenor.</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-indent: 0.5in"><B>8.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Mailing
of Notices</U>.</B> All notices hereunder shall be made in writing to the parties at the addresses listed below or at such other
address as shall be given by mail with postage paid and certified or registered or by facsimile or delivery via courier to the
respective parties. Mailed notices shall be deemed to be delivered three days following the date of such mailing. Facsimile transmissions
shall be deemed to be delivered on the date of the transmission, so long as a receipt confirming that the transmission was successful
is received. Notices delivered by courier shall be deemed to be received on the date of delivery by the courier service. Notices
shall be addressed (a) if to the Registered Holder, to the following address</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; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Dr. John Kramlich</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-indent: 0in">and (b) if to the Company, to the following
address:</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">ClearSign Combustion Corporation</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">12201 Tukwila International Boulevard</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Seattle, Washington 98168</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Attn.: Chief Executive Officer</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>9.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Rights as Shareholder</U>.</B> Until the exercise of this Warrant, the Registered Holder of this Warrant shall not have or exercise
any rights by virtue hereof as a shareholder of the Company.</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-indent: 0.5in"><B>10.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Fractional Shares</U>.</B> No fractional shares of Common Stock will be issued in connection with any exercise hereunder. In lieu
of any fractional shares which would otherwise be issuable, the Company shall pay an amount equal to the product of such fraction
multiplied by the fair market value of one share of Common Stock on the date of exercise.</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-indent: 0.5in"><B>11.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Amendment
or Waiver</U>. </B>Any term of this Warrant may be amended or waived upon written consent of the Company and the Registered Holder.
Any such waiver of a breach of any provision of this Warrant shall not operate as or be construed to be a waiver of any other breach
of such provision or of any breach of any other provision of this Warrant.</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-indent: 0.5in"><B>12.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Representations
of Holder</U>. </B>The Registered Holder hereby represents and warrants to the Company that: (a) he or she has had access to and
is familiar with information concerning the Company&rsquo;s business, affairs, financial condition, and prospects and (b) he or
she has such knowledge and experience in financial and business matters that he or she is capable of evaluating the merits and
risks of accepting the Warrant.</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-indent: 0.5in"><B>13.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Headings</U>.</B>
The headings in this Warrant are for purposes of reference only and shall not limit or otherwise affect the meaning of any provision
of this Warrant.</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-indent: 0.5in"><B>14.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Governing
Law</U>.</B> This Warrant shall be governed, construed and interpreted in accordance with the laws of the State of Washington,
without giving effect to principles of conflicts of law.</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-indent: 0.5in"><B>15.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Assignment</U>.</B> This Warrant is not assignable or transferable by the Registered Holder.</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; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-indent: 0in; font-weight: bold">CLEARSIGN COMBUSTION CORPORATION</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%; text-indent: 0in; font-weight: bold">&nbsp;</TD>
    <TD STYLE="width: 4%; text-indent: 0in; font-weight: bold">&nbsp;</TD>
    <TD STYLE="width: 46%; text-indent: 0in; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: justify; padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="text-align: justify; padding-bottom: 1pt">By:</TD>
    <TD STYLE="text-align: justify; border-bottom: Black 1pt solid">/s/ Richard Rutkowski</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: justify">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: justify">Name:&nbsp; Richard Rutkowski, Chief Executive Officer</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 2in; text-align: justify">&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><U>EXHIBIT A</U></B></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><U>PURCHASE FORM</U></B></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"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 7%">To:</TD>
    <TD STYLE="width: 69%; font-weight: bold">ClearSign Combustion Corporation</TD>
    <TD STYLE="width: 24%">Dated:</TD></TR>
</TABLE>
<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: 0.5in">The undersigned, pursuant to the provisions
set forth in the attached Warrant, hereby irrevocably elects to purchase _________________ shares of the Common Stock covered by
Warrant Number A-2 and herewith makes payment of $_____________, representing the full purchase price for such shares at the price
per share provided for in such Warrant.</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">
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    <TD STYLE="width: 49%">&nbsp;</TD>
    <TD STYLE="width: 11%">Signature:</TD>
    <TD STYLE="text-align: justify; border-bottom: Black 1pt solid; width: 40%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>Address:</TD>
    <TD STYLE="text-align: justify; border-bottom: Black 1pt solid">&nbsp;</TD></TR>
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<TYPE>EX-10.4
<SEQUENCE>5
<FILENAME>v328019_ex10-4.htm
<DESCRIPTION>EXHIBIT 10.4
<TEXT>
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<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="margin: 0">THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
AS AMENDED, AND HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF.
NO SUCH SALE OR DISPOSITION MAY BE EFFECTED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO OR AN OPINION OF COUNSEL
FOR THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF 1933, AS AMENDED.</P>

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

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

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<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%; font-size: 10pt; text-align: justify">Warrant No. A-3</TD>
    <TD STYLE="width: 50%; font-size: 10pt; text-align: right">Date of Issuance:&nbsp; February 16, 2011</TD></TR>
</TABLE>
<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>CLEARSIGN COMBUSTION CORPORATION</B></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><U>Common Stock Purchase Warrant</U></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">ClearSign Combustion Corporation (the &ldquo;Company&rdquo;),
for value received, hereby certifies that Dr. Uri Shumlak (the &ldquo;Registered Holder&rdquo;) is entitled, subject to the terms
set forth below, to purchase from the Company on or after the date that this Common Stock Purchase Warrant (the &ldquo;Warrant&rdquo;)
is issued (the &ldquo;Exercise Date&rdquo;), up to 10,000 shares of the Company&rsquo;s Common Stock at a purchase price of $2.25
per share. The right of the Registered Holder to purchase the Common Stock shall terminate at 5:00 p.m. Pacific time on February
16, 2021 (the &ldquo;Termination Date&rdquo;). The shares purchasable upon exercise of this Warrant, and the purchase price per
share, each as adjusted from time to time pursuant to the provisions of this Warrant, are hereinafter referred to as the &ldquo;Warrant
Stock&rdquo; and the &ldquo;Purchase Price,&rdquo; respectively.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in"><B>1.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Exercise</U>.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This
Warrant may be exercised by the Registered Holder at any time after the Exercise Date, in whole or in part, by surrendering this
Warrant, with the purchase form appended hereto as <U>Exhibit A</U> duly executed by the Registered Holder, at the principal office
of the Company or at such other office or agency as the Company may designate, accompanied by payment in full by cashier&rsquo;s
check, money order or wire transfer of the Purchase Price payable in respect of the number of shares of Warrant Stock purchased
upon such exercise.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each
exercise of this Warrant shall be deemed to have been effected immediately prior to the close of business on the day on which this
Warrant shall have been surrendered to the Company as provided in Section 1(a) above. At such time, the Registered Holder shall
be deemed to have become the holder of record of the Warrant Stock represented by such certificates.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Upon
exercise of this Warrant the Company, or the Company&rsquo;s agent, shall deliver to the Registered Holder a certificate for the
number of shares of Warrant Stock to which such Registered Holder shall be entitled.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in"><B>2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Adjustments</U>.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If
outstanding shares of the Company&rsquo;s Common Stock shall be subdivided into a greater number of shares or a dividend in Common
Stock shall be paid in respect of Common Stock, the Purchase Price in effect immediately prior to such subdivision or at the record
date of such dividend shall simultaneously with the effectiveness of such subdivision or immediately after the record date of such
dividend be proportionately reduced. If outstanding shares of Common Stock shall be combined into a smaller number of shares, the
Purchase Price in effect immediately prior to such combination shall, simultaneously with the effectiveness of such combination,
be proportionately increased. When any adjustment is required to be made in the Purchase Price, the number of shares of Warrant
Stock purchasable upon the exercise of this Warrant shall be changed to the number determined by dividing (i) an amount equal to
the number of shares issuable upon the exercise of this Warrant immediately prior to such adjustment, multiplied by the Purchase
Price in effect immediately prior to such adjustment, by (ii) the Purchase Price in effect immediately after such adjustment.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In
case of any recapitalization, reclassification or change of the outstanding securities of the Company or of any reorganization
of the Company or any similar corporate reorganization (other than a merger or consolidation with a wholly-owned subsidiary, a
reincorporation of the Company in a different jurisdiction, or other transaction in which there is no substantial change in the
stockholders of the Company or their relative stock holdings) on or after the date hereof (a &ldquo;Restructuring&rdquo;), then
as a condition to such Restructuring, lawful and adequate provisions shall be made so that in each such case the holder of this
Warrant, upon the exercise hereof at any time after the consummation of such reclassification, change or reorganization, shall
be entitled to receive, in lieu of the stock or other securities and property receivable upon the exercise hereof prior to such
consummation, the stock or other securities or property to which such holder would have been entitled upon such consummation if
such holder had exercised this Warrant immediately prior thereto, all subject to further adjustment as provided in paragraph (a);
and in each such case, the terms of this Section 2 shall be applicable to the shares of stock or other securities properly receivable
upon the exercise of this Warrant after such consummation.</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: 1in">(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;When
any adjustment is required to be made in the Purchase Price or the number of shares of Warrant Stock issuable upon exercise of
this Warrant, the Company shall promptly mail to the Registered Holder in accordance with Section 8 hereof a certificate setting
forth the Purchase Price after such adjustment and setting forth a brief statement of the facts requiring such adjustment. Such
certificate shall also set forth the kind and amount of stock or other securities or property into which this Warrant shall be
exercisable following the occurrence of any of the events specified in this Section 2.</P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in"><B>3.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Transfers</U>.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Registered Holder acknowledges that this Warrant and the Warrant Stock have not been registered under the Securities Act, and agrees
not to sell, pledge, distribute, offer for sale, transfer or otherwise dispose of this Warrant or any Warrant Stock issued upon
its exercise in the absence of (i) an effective registration statement under the Securities Act as to this Warrant and such Warrant
Stock and registration or qualification of this Warrant and such Warrant Stock under any applicable &ldquo;blue sky&rdquo; or state
securities law then in effect, or (ii) an opinion of counsel, reasonably satisfactory to the Company, that such registration and
qualification are not required.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Company will maintain a register containing the name and address of the Registered Holder. The Registered Holder may change his
or her address as shown on the warrant register by written notice to the Company requesting such change.</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-indent: 0.5in"><B>4.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Impairment</U>.</B> The Company will not, by amendment of its charter or through reorganization, consolidation, merger, dissolution,
sale of assets or any other voluntary action, avoid or seek to avoid the observance or performance of any of the terms of this
Warrant, but will at all times in good faith assist in the carrying out of all such terms and in the taking of all such action
as may be necessary or appropriate in order to protect the rights of the holder of this Warrant against impairment.</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-indent: 0.5in"><B>5.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Termination</U>.</B>
This Warrant (and the right to purchase securities upon exercise hereof) shall terminate upon the Termination Date.</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-indent: 0.5in"><B>6.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Reservation
of Stock</U>.</B> The Company covenants and agrees that all shares of Warrant Stock that may be issued upon the exercise of the
rights represented by this Warrant will, upon issuance, be duly authorized, validly issued, fully paid and non-assessable. The
Company will at all times reserve and keep available, solely for the issuance and delivery upon the exercise of this Warrant, such
shares of Warrant Stock and other stock, securities and property, as from time to time shall be issuable upon the exercise of this
Warrant. The Company will take all such action as may be necessary to assure that such shares of Warrant Stock may be issued as
provided herein without violation of any applicable law or regulation, or of any requirements of any domestic securities exchange
or quotation system upon which the Warrant Stock may be listed or quoted.</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-indent: 0.5in"><B>7.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Replacement
of Warrants</U>.</B> Upon receipt of evidence reasonably satisfactory to the Company of the loss, theft, destruction or mutilation
of this Warrant and (in the case of loss, theft or destruction) upon delivery of a reasonable indemnity agreement (with surety
if reasonably required) in an amount reasonably satisfactory to the Company, or (in the case of mutilation) upon surrender and
cancellation of this Warrant, the Company, at its own expense, will issue, in lieu thereof, a new Warrant of like tenor.</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-indent: 0.5in"><B>8.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Mailing
of Notices</U>.</B> All notices hereunder shall be made in writing to the parties at the addresses listed below or at such other
address as shall be given by mail with postage paid and certified or registered or by facsimile or delivery via courier to the
respective parties. Mailed notices shall be deemed to be delivered three days following the date of such mailing. Facsimile transmissions
shall be deemed to be delivered on the date of the transmission, so long as a receipt confirming that the transmission was successful
is received. Notices delivered by courier shall be deemed to be received on the date of delivery by the courier service. Notices
shall be addressed (a) if to the Registered Holder, to the following address</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; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Dr. Uri Shumlak</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-indent: 0in">and (b) if to the Company, to the following
address:</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">ClearSign Combustion Corporation</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">12201 Tukwila International Boulevard</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Seattle, Washington 98168</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Attn.: Chief Executive Officer</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>9.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Rights as Shareholder</U>.</B> Until the exercise of this Warrant, the Registered Holder of this Warrant shall not have or exercise
any rights by virtue hereof as a shareholder of the Company.</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-indent: 0.5in"><B>10.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Fractional Shares</U>.</B> No fractional shares of Common Stock will be issued in connection with any exercise hereunder. In lieu
of any fractional shares which would otherwise be issuable, the Company shall pay an amount equal to the product of such fraction
multiplied by the fair market value of one share of Common Stock on the date of exercise.</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-indent: 0.5in"><B>11.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Amendment
or Waiver</U>. </B>Any term of this Warrant may be amended or waived upon written consent of the Company and the Registered Holder.
Any such waiver of a breach of any provision of this Warrant shall not operate as or be construed to be a waiver of any other breach
of such provision or of any breach of any other provision of this Warrant.</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-indent: 0.5in"><B>12.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Representations
of Holder</U>. </B>The Registered Holder hereby represents and warrants to the Company that: (a) he or she has had access to and
is familiar with information concerning the Company&rsquo;s business, affairs, financial condition, and prospects and (b) he or
she has such knowledge and experience in financial and business matters that he or she is capable of evaluating the merits and
risks of accepting the Warrant.</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-indent: 0.5in"><B>13.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Headings</U>.</B>
The headings in this Warrant are for purposes of reference only and shall not limit or otherwise affect the meaning of any provision
of this Warrant.</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-indent: 0.5in"><B>14.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Governing
Law</U>.</B> This Warrant shall be governed, construed and interpreted in accordance with the laws of the State of Washington,
without giving effect to principles of conflicts of law.</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-indent: 0.5in"><B>15.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Assignment</U>.</B> This Warrant is not assignable or transferable by the Registered Holder.</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; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-indent: 0in; font-weight: bold">CLEARSIGN COMBUSTION CORPORATION</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-indent: 0in; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%; text-align: justify; padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="width: 4%; text-align: justify; padding-bottom: 1pt">By:</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: justify; width: 46%">/s/  Richard Rutkowski</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: justify">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: justify">Name:&nbsp; Richard Rutkowski, Chief Executive Officer</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 2in; text-align: justify">&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><U>EXHIBIT A</U></B></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><U>PURCHASE FORM</U></B></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 0.5in; text-align: left">To:</TD><TD STYLE="text-align: justify"><B>ClearSign Combustion Corporation</B>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Dated:</TD>
</TR></TABLE>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The undersigned, pursuant to the provisions
set forth in the attached Warrant, hereby irrevocably elects to purchase _________________ shares of the Common Stock covered by
Warrant Number A-3 and herewith makes payment of $_____________, representing the full purchase price for such shares at the price
per share provided for in such Warrant.</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: top">
    <TD STYLE="width: 50%">&nbsp;</TD>
    <TD STYLE="width: 8%">Signature:&nbsp;</TD>
    <TD STYLE="width: 42%; border-bottom: windowtext 1pt solid">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>Address:</TD>
    <TD STYLE="border-bottom: windowtext 1pt solid">&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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</DOCUMENT>
<DOCUMENT>
<TYPE>EX-10.5
<SEQUENCE>6
<FILENAME>v328019_ex10-5.htm
<DESCRIPTION>EXHIBIT 10.5
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
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<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left">THE SECURITIES REPRESENTED BY THIS CERTIFICATE
HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW
TO, OR IN CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF. NO SUCH SALE OR DISPOSITION MAY BE EFFECTED WITHOUT AN EFFECTIVE REGISTRATION
STATEMENT RELATED THERETO OR AN OPINION OF COUNSEL FOR THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES
ACT OF 1933, AS AMENDED.</P>

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%; font-size: 10pt; text-align: justify">Warrant No. A-4</TD>
    <TD STYLE="width: 50%; font-size: 10pt; text-align: right">Date of Issuance:&nbsp; February 16, 2011</TD></TR>
</TABLE>
<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>CLEARSIGN COMBUSTION CORPORATION</B></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><U>Common Stock Purchase Warrant</U></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">ClearSign Combustion Corporation (the &ldquo;Company&rdquo;),
for value received, hereby certifies that Tim Londergan (the &ldquo;Registered Holder&rdquo;) is entitled, subject to the terms
set forth below, to purchase from the Company on or after the date that this Common Stock Purchase Warrant (the &ldquo;Warrant&rdquo;)
is issued (the &ldquo;Exercise Date&rdquo;), up to 10,000 shares of the Company&rsquo;s Common Stock at a purchase price of $2.25
per share. The right of the Registered Holder to purchase the Common Stock shall terminate at 5:00 p.m. Pacific time on February
16, 2021 (the &ldquo;Termination Date&rdquo;). The shares purchasable upon exercise of this Warrant, and the purchase price per
share, each as adjusted from time to time pursuant to the provisions of this Warrant, are hereinafter referred to as the &ldquo;Warrant
Stock&rdquo; and the &ldquo;Purchase Price,&rdquo; respectively.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in"><B>1.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Exercise</U>.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This
Warrant may be exercised by the Registered Holder at any time after the Exercise Date, in whole or in part, by surrendering this
Warrant, with the purchase form appended hereto as <U>Exhibit A</U> duly executed by the Registered Holder, at the principal office
of the Company or at such other office or agency as the Company may designate, accompanied by payment in full by cashier&rsquo;s
check, money order or wire transfer of the Purchase Price payable in respect of the number of shares of Warrant Stock purchased
upon such exercise.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each
exercise of this Warrant shall be deemed to have been effected immediately prior to the close of business on the day on which this
Warrant shall have been surrendered to the Company as provided in Section 1(a) above. At such time, the Registered Holder shall
be deemed to have become the holder of record of the Warrant Stock represented by such certificates.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Upon
exercise of this Warrant the Company, or the Company&rsquo;s agent, shall deliver to the Registered Holder a certificate for the
number of shares of Warrant Stock to which such Registered Holder shall be entitled.</P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in"><B>2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Adjustments</U>.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If
outstanding shares of the Company&rsquo;s Common Stock shall be subdivided into a greater number of shares or a dividend in Common
Stock shall be paid in respect of Common Stock, the Purchase Price in effect immediately prior to such subdivision or at the record
date of such dividend shall simultaneously with the effectiveness of such subdivision or immediately after the record date of such
dividend be proportionately reduced. If outstanding shares of Common Stock shall be combined into a smaller number of shares, the
Purchase Price in effect immediately prior to such combination shall, simultaneously with the effectiveness of such combination,
be proportionately increased. When any adjustment is required to be made in the Purchase Price, the number of shares of Warrant
Stock purchasable upon the exercise of this Warrant shall be changed to the number determined by dividing (i) an amount equal to
the number of shares issuable upon the exercise of this Warrant immediately prior to such adjustment, multiplied by the Purchase
Price in effect immediately prior to such adjustment, by (ii) the Purchase Price in effect immediately after such adjustment.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In
case of any recapitalization, reclassification or change of the outstanding securities of the Company or of any reorganization
of the Company or any similar corporate reorganization (other than a merger or consolidation with a wholly-owned subsidiary, a
reincorporation of the Company in a different jurisdiction, or other transaction in which there is no substantial change in the
stockholders of the Company or their relative stock holdings) on or after the date hereof (a &ldquo;Restructuring&rdquo;), then
as a condition to such Restructuring, lawful and adequate provisions shall be made so that in each such case the holder of this
Warrant, upon the exercise hereof at any time after the consummation of such reclassification, change or reorganization, shall
be entitled to receive, in lieu of the stock or other securities and property receivable upon the exercise hereof prior to such
consummation, the stock or other securities or property to which such holder would have been entitled upon such consummation if
such holder had exercised this Warrant immediately prior thereto, all subject to further adjustment as provided in paragraph (a);
and in each such case, the terms of this Section 2 shall be applicable to the shares of stock or other securities properly receivable
upon the exercise of this Warrant after such consummation.</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">&#9;(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;When
any adjustment is required to be made in the Purchase Price or the number of shares of Warrant Stock issuable upon exercise of
this Warrant, the Company shall promptly mail to the Registered Holder in accordance with Section 8 hereof a certificate setting
forth the Purchase Price after such adjustment and setting forth a brief statement of the facts requiring such adjustment. Such
certificate shall also set forth the kind and amount of stock or other securities or property into which this Warrant shall be
exercisable following the occurrence of any of the events specified in this Section 2.</P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in"><B>3.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Transfers</U>.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Registered Holder acknowledges that this Warrant and the Warrant Stock have not been registered under the Securities Act, and agrees
not to sell, pledge, distribute, offer for sale, transfer or otherwise dispose of this Warrant or any Warrant Stock issued upon
its exercise in the absence of (i) an effective registration statement under the Securities Act as to this Warrant and such Warrant
Stock and registration or qualification of this Warrant and such Warrant Stock under any applicable &ldquo;blue sky&rdquo; or state
securities law then in effect, or (ii) an opinion of counsel, reasonably satisfactory to the Company, that such registration and
qualification are not required.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Company will maintain a register containing the name and address of the Registered Holder. The Registered Holder may change his
or her address as shown on the warrant register by written notice to the Company requesting such change.</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-indent: 0.5in"><B>4.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Impairment</U>.</B> The Company will not, by amendment of its charter or through reorganization, consolidation, merger, dissolution,
sale of assets or any other voluntary action, avoid or seek to avoid the observance or performance of any of the terms of this
Warrant, but will at all times in good faith assist in the carrying out of all such terms and in the taking of all such action
as may be necessary or appropriate in order to protect the rights of the holder of this Warrant against impairment.</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-indent: 0.5in"><B>5.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Termination</U>.</B>
This Warrant (and the right to purchase securities upon exercise hereof) shall terminate upon the Termination Date.</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-indent: 0.5in"><B>6.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Reservation
of Stock</U>.</B> The Company covenants and agrees that all shares of Warrant Stock that may be issued upon the exercise of the
rights represented by this Warrant will, upon issuance, be duly authorized, validly issued, fully paid and non-assessable. The
Company will at all times reserve and keep available, solely for the issuance and delivery upon the exercise of this Warrant, such
shares of Warrant Stock and other stock, securities and property, as from time to time shall be issuable upon the exercise of this
Warrant. The Company will take all such action as may be necessary to assure that such shares of Warrant Stock may be issued as
provided herein without violation of any applicable law or regulation, or of any requirements of any domestic securities exchange
or quotation system upon which the Warrant Stock may be listed or quoted.</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-indent: 0.5in"><B>7.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Replacement
of Warrants</U>.</B> Upon receipt of evidence reasonably satisfactory to the Company of the loss, theft, destruction or mutilation
of this Warrant and (in the case of loss, theft or destruction) upon delivery of a reasonable indemnity agreement (with surety
if reasonably required) in an amount reasonably satisfactory to the Company, or (in the case of mutilation) upon surrender and
cancellation of this Warrant, the Company, at its own expense, will issue, in lieu thereof, a new Warrant of like tenor.</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-indent: 0.5in"><B>8.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Mailing
of Notices</U>.</B> All notices hereunder shall be made in writing to the parties at the addresses listed below or at such other
address as shall be given by mail with postage paid and certified or registered or by facsimile or delivery via courier to the
respective parties. Mailed notices shall be deemed to be delivered three days following the date of such mailing. Facsimile transmissions
shall be deemed to be delivered on the date of the transmission, so long as a receipt confirming that the transmission was successful
is received. Notices delivered by courier shall be deemed to be received on the date of delivery by the courier service. Notices
shall be addressed (a) if to the Registered Holder, to the following address</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">Tim Londergan</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-indent: 0in">and (b) if to the Company, to the following
address:</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">ClearSign Combustion Corporation</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">12201 Tukwila International Boulevard</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Seattle, Washington 98168</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Attn.: Chief Executive Officer</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>9.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Rights as Shareholder</U>.</B> Until the exercise of this Warrant, the Registered Holder of this Warrant shall not have or exercise
any rights by virtue hereof as a shareholder of the Company.</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-indent: 0.5in"><B>10.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Fractional Shares</U>.</B> No fractional shares of Common Stock will be issued in connection with any exercise hereunder. In lieu
of any fractional shares which would otherwise be issuable, the Company shall pay an amount equal to the product of such fraction
multiplied by the fair market value of one share of Common Stock on the date of exercise.</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-indent: 0.5in"><B>11.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Amendment
or Waiver</U>. </B>Any term of this Warrant may be amended or waived upon written consent of the Company and the Registered Holder.
Any such waiver of a breach of any provision of this Warrant shall not operate as or be construed to be a waiver of any other breach
of such provision or of any breach of any other provision of this Warrant.</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-indent: 0.5in"><B>12.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Representations
of Holder</U>. </B>The Registered Holder hereby represents and warrants to the Company that: (a) he or she has had access to and
is familiar with information concerning the Company&rsquo;s business, affairs, financial condition, and prospects and (b) he or
she has such knowledge and experience in financial and business matters that he or she is capable of evaluating the merits and
risks of accepting the Warrant.</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-indent: 0.5in"><B>13.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Headings</U>.</B>
The headings in this Warrant are for purposes of reference only and shall not limit or otherwise affect the meaning of any provision
of this Warrant.</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-indent: 0.5in"><B>14.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Governing
Law</U>.</B> This Warrant shall be governed, construed and interpreted in accordance with the laws of the State of Washington,
without giving effect to principles of conflicts of law.</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-indent: 0.5in"><B>15.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Assignment</U>.</B> This Warrant is not assignable or transferable by the Registered Holder.</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; text-indent: 0.5in">&nbsp;</P>

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<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-indent: 0in; font-weight: bold">CLEARSIGN COMBUSTION CORPORATION</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-indent: 0in; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%; text-align: justify; padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="width: 4%; text-align: justify; padding-bottom: 1pt">By:</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: justify; width: 46%">/s/ Richard Rutkowski</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: justify">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: justify">Name:&nbsp; Richard Rutkowski, Chief Executive Officer</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 2in; text-align: justify">&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><U>EXHIBIT A</U></B></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><U>PURCHASE FORM</U></B></P>

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 7%">To:</TD>
    <TD STYLE="width: 76%; font-weight: bold">ClearSign Combustion Corporation</TD>
    <TD STYLE="width: 17%">Dated:</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The undersigned, pursuant to the provisions
set forth in the attached Warrant, hereby irrevocably elects to purchase _________________ shares of the Common Stock covered by
Warrant Number A-4 and herewith makes payment of $_____________, representing the full purchase price for such shares at the price
per share provided for in such Warrant.</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: top">
    <TD STYLE="width: 50%">&nbsp;</TD>
    <TD STYLE="width: 8%">Signature:&nbsp;</TD>
    <TD STYLE="width: 42%; border-bottom: windowtext 1pt solid">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>Address:</TD>
    <TD STYLE="border-bottom: windowtext 1pt solid">&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<DOCUMENT>
<TYPE>EX-10.6
<SEQUENCE>7
<FILENAME>v328019_ex10-6.htm
<DESCRIPTION>EXHIBIT 10.6
<TEXT>
<HTML>
<HEAD>
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<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left">THE SECURITIES REPRESENTED BY THIS CERTIFICATE
HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW
TO, OR IN CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF. NO SUCH SALE OR DISPOSITION MAY BE EFFECTED WITHOUT AN EFFECTIVE REGISTRATION
STATEMENT RELATED THERETO OR AN OPINION OF COUNSEL FOR THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES
ACT OF 1933, AS AMENDED.</P>

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%; font-size: 10pt; text-align: justify">Warrant No. A-5</TD>
    <TD STYLE="width: 50%; font-size: 10pt; text-align: right">Date of Issuance:&nbsp; February 16, 2011</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>CLEARSIGN COMBUSTION CORPORATION</B></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><U>Common Stock Purchase Warrant</U></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">ClearSign Combustion Corporation (the &ldquo;Company&rdquo;),
for value received, hereby certifies that Tracy Prevo (the &ldquo;Registered Holder&rdquo;) is entitled, subject to the terms set
forth below, to purchase from the Company on or after the date that this Common Stock Purchase Warrant (the &ldquo;Warrant&rdquo;)
is issued (the &ldquo;Exercise Date&rdquo;), up to 20,000 shares of the Company&rsquo;s Common Stock at a purchase price of $2.25
per share. The right of the Registered Holder to purchase the Common Stock shall terminate at 5:00 p.m. Pacific time on February
16, 2021 (the &ldquo;Termination Date&rdquo;). The shares purchasable upon exercise of this Warrant, and the purchase price per
share, each as adjusted from time to time pursuant to the provisions of this Warrant, are hereinafter referred to as the &ldquo;Warrant
Stock&rdquo; and the &ldquo;Purchase Price,&rdquo; respectively.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in"><B>1.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Exercise</U>.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This
Warrant may be exercised by the Registered Holder at any time after the Exercise Date, in whole or in part, by surrendering this
Warrant, with the purchase form appended hereto as <U>Exhibit A</U> duly executed by the Registered Holder, at the principal office
of the Company or at such other office or agency as the Company may designate, accompanied by payment in full by cashier&rsquo;s
check, money order or wire transfer of the Purchase Price payable in respect of the number of shares of Warrant Stock purchased
upon such exercise.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each
exercise of this Warrant shall be deemed to have been effected immediately prior to the close of business on the day on which this
Warrant shall have been surrendered to the Company as provided in Section 1(a) above. At such time, the Registered Holder shall
be deemed to have become the holder of record of the Warrant Stock represented by such certificates.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Upon
exercise of this Warrant the Company, or the Company&rsquo;s agent, shall deliver to the Registered Holder a certificate for the
number of shares of Warrant Stock to which such Registered Holder shall be entitled.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in"><B>2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Adjustments</U>.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If
outstanding shares of the Company&rsquo;s Common Stock shall be subdivided into a greater number of shares or a dividend in Common
Stock shall be paid in respect of Common Stock, the Purchase Price in effect immediately prior to such subdivision or at the record
date of such dividend shall simultaneously with the effectiveness of such subdivision or immediately after the record date of such
dividend be proportionately reduced. If outstanding shares of Common Stock shall be combined into a smaller number of shares, the
Purchase Price in effect immediately prior to such combination shall, simultaneously with the effectiveness of such combination,
be proportionately increased. When any adjustment is required to be made in the Purchase Price, the number of shares of Warrant
Stock purchasable upon the exercise of this Warrant shall be changed to the number determined by dividing (i) an amount equal to
the number of shares issuable upon the exercise of this Warrant immediately prior to such adjustment, multiplied by the Purchase
Price in effect immediately prior to such adjustment, by (ii) the Purchase Price in effect immediately after such adjustment.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In
case of any recapitalization, reclassification or change of the outstanding securities of the Company or of any reorganization
of the Company or any similar corporate reorganization (other than a merger or consolidation with a wholly-owned subsidiary, a
reincorporation of the Company in a different jurisdiction, or other transaction in which there is no substantial change in the
stockholders of the Company or their relative stock holdings) on or after the date hereof (a &ldquo;Restructuring&rdquo;), then
as a condition to such Restructuring, lawful and adequate provisions shall be made so that in each such case the holder of this
Warrant, upon the exercise hereof at any time after the consummation of such reclassification, change or reorganization, shall
be entitled to receive, in lieu of the stock or other securities and property receivable upon the exercise hereof prior to such
consummation, the stock or other securities or property to which such holder would have been entitled upon such consummation if
such holder had exercised this Warrant immediately prior thereto, all subject to further adjustment as provided in paragraph (a);
and in each such case, the terms of this Section 2 shall be applicable to the shares of stock or other securities properly receivable
upon the exercise of this Warrant after such consummation.</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: 1in">(c)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;When
any adjustment is required to be made in the Purchase Price or the number of shares of Warrant Stock issuable upon exercise of
this Warrant, the Company shall promptly mail to the Registered Holder in accordance with Section 8 hereof a certificate setting
forth the Purchase Price after such adjustment and setting forth a brief statement of the facts requiring such adjustment. Such
certificate shall also set forth the kind and amount of stock or other securities or property into which this Warrant shall be
exercisable following the occurrence of any of the events specified in this Section 2.</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; text-align: justify; text-indent: 0.5in"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in"><B>3.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Transfers</U>.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(a)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Registered Holder acknowledges that this Warrant and the Warrant Stock have not been registered under the Securities Act, and agrees
not to sell, pledge, distribute, offer for sale, transfer or otherwise dispose of this Warrant or any Warrant Stock issued upon
its exercise in the absence of (i) an effective registration statement under the Securities Act as to this Warrant and such Warrant
Stock and registration or qualification of this Warrant and such Warrant Stock under any applicable &ldquo;blue sky&rdquo; or state
securities law then in effect, or (ii) an opinion of counsel, reasonably satisfactory to the Company, that such registration and
qualification are not required.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">(b)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Company will maintain a register containing the name and address of the Registered Holder. The Registered Holder may change his
or her address as shown on the warrant register by written notice to the Company requesting such change.</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-indent: 0.5in"><B>4.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Impairment</U>.</B> The Company will not, by amendment of its charter or through reorganization, consolidation, merger, dissolution,
sale of assets or any other voluntary action, avoid or seek to avoid the observance or performance of any of the terms of this
Warrant, but will at all times in good faith assist in the carrying out of all such terms and in the taking of all such action
as may be necessary or appropriate in order to protect the rights of the holder of this Warrant against impairment.</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-indent: 0.5in"><B>5.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Termination</U>.</B>
This Warrant (and the right to purchase securities upon exercise hereof) shall terminate upon the Termination Date.</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-indent: 0.5in"><B>6.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Reservation
of Stock</U>.</B> The Company covenants and agrees that all shares of Warrant Stock that may be issued upon the exercise of the
rights represented by this Warrant will, upon issuance, be duly authorized, validly issued, fully paid and non-assessable. The
Company will at all times reserve and keep available, solely for the issuance and delivery upon the exercise of this Warrant, such
shares of Warrant Stock and other stock, securities and property, as from time to time shall be issuable upon the exercise of this
Warrant. The Company will take all such action as may be necessary to assure that such shares of Warrant Stock may be issued as
provided herein without violation of any applicable law or regulation, or of any requirements of any domestic securities exchange
or quotation system upon which the Warrant Stock may be listed or quoted.</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-indent: 0.5in"><B>7.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Replacement
of Warrants</U>.</B> Upon receipt of evidence reasonably satisfactory to the Company of the loss, theft, destruction or mutilation
of this Warrant and (in the case of loss, theft or destruction) upon delivery of a reasonable indemnity agreement (with surety
if reasonably required) in an amount reasonably satisfactory to the Company, or (in the case of mutilation) upon surrender and
cancellation of this Warrant, the Company, at its own expense, will issue, in lieu thereof, a new Warrant of like tenor.</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-indent: 0.5in"><B>8.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Mailing
of Notices</U>.</B> All notices hereunder shall be made in writing to the parties at the addresses listed below or at such other
address as shall be given by mail with postage paid and certified or registered or by facsimile or delivery via courier to the
respective parties. Mailed notices shall be deemed to be delivered three days following the date of such mailing. Facsimile transmissions
shall be deemed to be delivered on the date of the transmission, so long as a receipt confirming that the transmission was successful
is received. Notices delivered by courier shall be deemed to be received on the date of delivery by the courier service. Notices
shall be addressed (a) if to the Registered Holder, to the following address</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; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Tracy Prevo</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-indent: 0in">and (b) if to the Company, to the following
address:</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">ClearSign Combustion Corporation</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">12201 Tukwila International Boulevard</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Seattle, Washington 98168</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Attn.: Chief Executive Officer</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>9.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Rights as Shareholder</U>.</B> Until the exercise of this Warrant, the Registered Holder of this Warrant shall not have or exercise
any rights by virtue hereof as a shareholder of the Company.</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-indent: 0.5in"><B>10.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Fractional Shares</U>.</B> No fractional shares of Common Stock will be issued in connection with any exercise hereunder. In lieu
of any fractional shares which would otherwise be issuable, the Company shall pay an amount equal to the product of such fraction
multiplied by the fair market value of one share of Common Stock on the date of exercise.</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-indent: 0.5in"><B>11.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Amendment
or Waiver</U>. </B>Any term of this Warrant may be amended or waived upon written consent of the Company and the Registered Holder.
Any such waiver of a breach of any provision of this Warrant shall not operate as or be construed to be a waiver of any other breach
of such provision or of any breach of any other provision of this Warrant.</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-indent: 0.5in"><B>12.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Representations
of Holder</U>. </B>The Registered Holder hereby represents and warrants to the Company that: (a) he or she has had access to and
is familiar with information concerning the Company&rsquo;s business, affairs, financial condition, and prospects and (b) he or
she has such knowledge and experience in financial and business matters that he or she is capable of evaluating the merits and
risks of accepting the Warrant.</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-indent: 0.5in"><B>13.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Headings</U>.</B>
The headings in this Warrant are for purposes of reference only and shall not limit or otherwise affect the meaning of any provision
of this Warrant.</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-indent: 0.5in"><B>14.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Governing
Law</U>.</B> This Warrant shall be governed, construed and interpreted in accordance with the laws of the State of Washington,
without giving effect to principles of conflicts of law.</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-indent: 0.5in"><B>15.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>No
Assignment</U>.</B> This Warrant is not assignable or transferable by the Registered Holder.</P>

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

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    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 12pt"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif"><TR><TD STYLE="text-align: center; width: 100%">&nbsp;</TD></TR></TABLE></DIV>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-indent: 0in; font-weight: bold">CLEARSIGN COMBUSTION CORPORATION</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-indent: 0in; font-weight: bold">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-indent: 0in; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%; text-align: justify; padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="width: 4%; text-align: justify; padding-bottom: 1pt">By:</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: justify; width: 46%">/s/ Richard Rutkowski</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: justify">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: justify">Name:&nbsp; Richard Rutkowski, Chief Executive Officer</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 2in; text-align: justify">&nbsp;</P>

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    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 12pt"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif"><TR><TD STYLE="text-align: center; width: 100%">&nbsp;</TD></TR></TABLE></DIV>
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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><U>EXHIBIT A</U></B></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><U>PURCHASE FORM</U></B></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 6pt"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 0.5in; text-align: left">To:</TD><TD STYLE="text-align: justify"><B>ClearSign Combustion Corporation</B>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Dated:</TD>
</TR></TABLE>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The undersigned, pursuant to the provisions
set forth in the attached Warrant, hereby irrevocably elects to purchase _________________ shares of the Common Stock covered by
Warrant Number A-5 and herewith makes payment of $_____________, representing the full purchase price for such shares at the price
per share provided for in such Warrant.</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: top">
    <TD STYLE="width: 50%; padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="width: 8%; padding-bottom: 1pt">Signature:&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: justify; width: 42%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>Address:</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: justify">&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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</BODY>
</HTML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>8
<FILENAME>v328019_ex23-1.htm
<DESCRIPTION>EXHIBIT 23.1
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="margin: 0"><IMG SRC="ex23-1logo.jpg" ALT="">&nbsp;</P>

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

<P STYLE="margin-top: 0; text-align: center; margin-bottom: 0"><B>CONSENT OF INDEPENDENT REGISTRERED PUBLIC ACCOUNTING FIRM</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">ClearSign Combustion Corporation</P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">We consent to the incorporation by reference in Registration
Statement of ClearSign Combustion Corporation on Form S-8 with respect to the registration of 985,434 shares of the Company&rsquo;s
common stock for the Company&rsquo;s 2011 Equity Incentive Plan and 80,000 shares of common stock underlying warrants issued for
compensation of our report dated January 23, 2012, relating to the financial statements of ClearSign Combustion Corporation as
of December 31, 2011 and 2010, and the related statement of operations, stockholders&rsquo; equity (deficit), and cash flows for
each of the years ended December 31, 2011 and 2010, and for the period from inception (January 23, 2008) through December 31, 2011,
which is contained in a prospectus filed on April 25, 2012 pursuant to Rule 424(b)1 promulgated under the Securities Act of 1933.
Our report contains an explanatory paragraph regarding the Company&rsquo;s ability to continue as a going concern.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">/s/ Gumbiner Savett Inc.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">November 9, 2012</P>

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



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

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