<SEC-DOCUMENT>0001144204-19-015348.txt : 20190321
<SEC-HEADER>0001144204-19-015348.hdr.sgml : 20190321
<ACCEPTANCE-DATETIME>20190321160300
ACCESSION NUMBER:		0001144204-19-015348
CONFORMED SUBMISSION TYPE:	PRE 14A
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20190321
FILED AS OF DATE:		20190321
DATE AS OF CHANGE:		20190321

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
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		PRE 14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35521
		FILM NUMBER:		19697048

	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>PRE 14A
<SEQUENCE>1
<FILENAME>tv516851_pre14a.htm
<DESCRIPTION>PRE 14A
<TEXT>
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<P STYLE="margin: 0"></P>

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

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

<!-- Field: Rule-Page --><DIV ALIGN="LEFT" STYLE="margin-top: 0; margin-bottom: 0"><DIV STYLE="font-size: 1pt; border-top: Black 2pt solid; border-bottom: Black 1pt solid; width: 100%">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<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>SCHEDULE 14A</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(RULE 14a-101)</B></P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SCHEDULE 14A INFORMATION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Proxy Statement Pursuant to Section 14(a)
of the</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Securities Exchange Act of 1934</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"><FONT STYLE="font-family: Times New Roman, Times, Serif">Filed
by the Registrant </FONT><FONT STYLE="font-family: Wingdings">x</FONT></P>



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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">Filed
by a Party other than the Registrant </FONT><FONT STYLE="font-family: Wingdings">&uml;</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Check the appropriate box:</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: 0.25in"><FONT STYLE="font-family: Wingdings; font-size: 10pt">x</FONT></TD>
    <TD STYLE="padding-bottom: 3pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Preliminary Proxy Statement&nbsp; </FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 3pt"><FONT STYLE="font-family: Wingdings; font-size: 10pt">&uml;</FONT></TD>
    <TD STYLE="padding-bottom: 3pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2))</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 3pt"><FONT STYLE="font-family: Wingdings; font-size: 10pt">&uml;</FONT></TD>
    <TD STYLE="padding-bottom: 3pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Definitive Proxy Statement</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 3pt"><FONT STYLE="font-family: Wingdings; font-size: 10pt">&uml;</FONT></TD>
    <TD STYLE="padding-bottom: 3pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Definitive Additional Materials &nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-family: Wingdings; font-size: 10pt">&uml;</FONT></TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Soliciting Material Pursuant to &sect;240.14a-12</FONT></TD></TR>
</TABLE>


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 14pt"><B>ClearSign
Combustion Corporation</B></FONT></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">(Name of Registrant as Specified in Its
Charter)</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">(Name of Person(s) Filing Proxy Statement,
if Other Than the Registrant)</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Payment of Filing Fee (Check the appropriate box):</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Wingdings">x</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif">No
fee required.</FONT></TD>
</TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Wingdings">&uml;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif">Fee
computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.</FONT></TD>
</TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">1.</TD><TD>Title of each class of securities to which transaction applies:</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">2.</TD><TD>Aggregate number of securities to which transaction applies:</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">3.</TD><TD>Per unit price or other underlying value of transaction computed pursuant to Exchange Act&nbsp;Rule 0-11 (set forth the amount
on which the filing fee is calculated and state how it was determined):</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">4.</TD><TD>Proposed maximum aggregate value of transaction:</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">5.</TD><TD>Total fee paid:</TD></TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Wingdings">&uml;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif">Fee
paid previously with preliminary materials:</FONT></TD>
</TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Wingdings">&uml;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif">Check
box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting
fee was paid previously.&nbsp; Identify the previous filing by registration statement number, or the form or schedule and the
date of its filing.</FONT></TD>
</TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">1.</TD><TD><P STYLE="margin-top: 0; margin-bottom: 0">Amount previously
paid:</P></TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">2.</TD><TD>Form, Schedule or Registration Statement No.:</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">3.</TD><TD>Filing Party:</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">4.</TD><TD>Date Filed:</TD></TR></TABLE>

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

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

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; text-align: center; margin-bottom: 0pt"><IMG SRC="tv516851_pre14aimg01.jpg" ALT=""></P>

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

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

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

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

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">You are invited to attend the Annual Meeting
of Shareholders of ClearSign Combustion Corporation on May 8, 2019, which will be held at our corporate office at 12870 Interurban
Avenue South, Seattle, Washington 98168 at 1:30 p.m. local time. Enclosed with this letter are your Notice of Annual Meeting of
Shareholders, proxy statement and proxy voting card along with a copy of the Company&rsquo;s Annual Report on Form 10-K. The proxy
statement included with this letter discusses each of the proposals to be considered at the Annual Meeting.</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: 0.5in">At this year&rsquo;s meeting, you will be
asked to: (1) elect five directors to serve until the election and qualification of their successors; (2) approve, on an advisory
basis, the appointment of Gumbiner Savett Inc. as our independent registered public accounting firm for the fiscal year ending
December 31, 2019; (3) approve an amendment to the ClearSign Combustion Corporation 2011 Equity Incentive Plan to increase the
number of shares of common stock reserved for awards; (4) approve an amendment to our articles of incorporation to specify the
threshold of shareholder votes required to call a special meeting of shareholders; (5) approve, on an advisory basis, the compensation
paid to our named executive officers; and (6) approve one or more adjournments of the Annual Meeting to a later date or dates to
solicit additional proxies if there are insufficient votes to approve the amendment to the 2011 Equity Incentive Plan, approve
the amendment to our articles of incorporation or in the absence of a quorum.</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 Board of Directors has fixed the close
of business on March 8, 2019 as the record date for determining the shareholders entitled to notice of and to vote at the Annual
Meeting and any adjournment and postponements thereof (the &ldquo;Record Date&rdquo;).</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Please use this opportunity to take part
in the affairs of the Company by voting on the business to come before this meeting. If you are a record holder of the Company&rsquo;s
common stock on the Record Date, you are eligible to vote with respect to these matters personally, either at the meeting or by
proxy. It is important that your shares be voted, whether or not you plan to attend the meeting, to ensure the presence of a quorum.
We urge you to authorize your proxy in advance by following the instructions printed on it. Returning the proxy does NOT deprive
you of your right to attend the meeting and vote your shares in person.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 2in; 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: 50%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Sincerely,</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ Colin James Deller</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Colin James Deller, Chief Executive Officer</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Seattle, Washington</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">April &nbsp;&nbsp;&nbsp;, 2019</FONT></TD>
    <TD>&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right">&nbsp;</P>


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><IMG SRC="tv516851_pre14aimg01.jpg" ALT=""></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>12870 Interurban Avenue South</B></P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>to be held May 8, 2019</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">To the Shareholders of ClearSign Combustion Corporation:</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">The Annual Meeting of Shareholders will be held at our office
at 12870 Interurban Avenue South, Seattle, Washington 98168 at 1:30 p.m. local time on May 8, 2019. During the Annual Meeting,
shareholders will be asked to:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">(1)</TD><TD>elect five directors to serve until the election and qualification of their successors;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">(2)</TD><TD>approve, on an advisory basis, the appointment of Gumbiner Savett Inc. as our independent registered public accounting firm
for the year ending December 31, 2019;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">(3)</TD><TD>approve an amendment to the ClearSign Combustion Corporation 2011 Equity Incentive Plan to increase the number of shares of
common stock reserved for awards;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">(4)</TD><TD>approve an amendment to our articles of incorporation to specify the threshold of shareholder votes required to call a special
meeting of shareholders;</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">(5)</TD><TD>approve, on an advisory basis, the compensation paid to our named executive officers; and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">(6)</TD><TD>approve one or more adjournments of the Annual Meeting to a later date or dates to solicit additional proxies if there are
insufficient votes to approve the amendment to the 2011 Equity Incentive Plan, approve the amendment to our articles of incorporation
or in the absence of a quorum.</TD></TR></TABLE>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">If you are a shareholder of record as of March 8, 2019, you
may vote at the meeting. The date of mailing this Notice of Meeting and proxy statement is on or about April , 2019.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">By order of our Board of Directors</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%; border-bottom: Black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ Brian G. Fike</FONT></TD>
    <TD STYLE="width: 50%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Brian G. Fike</FONT></TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">interim Chief Financial Officer, Treasurer and Secretary</FONT></TD>
    <TD>&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></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: 90%">&nbsp;</TD>
    <TD STYLE="width: 10%; border-bottom: black 1pt solid; text-align: center"><FONT STYLE="font-size: 10pt"><B>Page No.</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; background-color: #CCEEFF">
    <TD><A HREF="#a_001"><FONT STYLE="font-size: 10pt">The Proxy Procedure</FONT></A></TD>
    <TD STYLE="text-align: center"><A HREF="#a_001"><FONT STYLE="font-size: 10pt">i</FONT></A></TD></TR>
<TR STYLE="vertical-align: top; background-color: white">
    <TD><A HREF="#a_002"><FONT STYLE="font-size: 10pt">About the Meeting:&nbsp;&nbsp;Questions and Answers</FONT></A></TD>
    <TD STYLE="text-align: center"><A HREF="#a_002"><FONT STYLE="font-size: 10pt">1</FONT></A></TD></TR>
<TR STYLE="vertical-align: top; background-color: #CCEEFF">
    <TD><A HREF="#a_003"><FONT STYLE="font-size: 10pt">Governance of the Company</FONT></A></TD>
    <TD STYLE="text-align: center"><A HREF="#a_003"><FONT STYLE="font-size: 10pt">6</FONT></A></TD></TR>
<TR STYLE="vertical-align: top; background-color: white">
    <TD><A HREF="#a_004"><FONT STYLE="font-size: 10pt">Proposal 1 - Election of Directors</FONT></A></TD>
    <TD STYLE="text-align: center"><A HREF="#a_004"><FONT STYLE="font-size: 10pt">11</FONT></A></TD></TR>
<TR STYLE="vertical-align: top; background-color: #CCEEFF">
    <TD><A HREF="#a_005"><FONT STYLE="font-size: 10pt">Report of the Audit Committee</FONT></A></TD>
    <TD STYLE="text-align: center"><A HREF="#a_005"><FONT STYLE="font-size: 10pt">14</FONT></A></TD></TR>
<TR STYLE="vertical-align: top; background-color: white">
    <TD STYLE="padding-left: 0.75in; text-indent: -0.75in"><A HREF="#a_006"><FONT STYLE="font-size: 10pt">Proposal 2 &ndash; Approve, on an Advisory Basis, of the Appointment of An Independent Registered Public Accounting Firm</FONT></A></TD>
    <TD STYLE="text-align: center"><A HREF="#a_006"><FONT STYLE="font-size: 10pt">15</FONT></A></TD></TR>
<TR STYLE="vertical-align: top; background-color: #CCEEFF">
    <TD><A HREF="#a_007"><FONT STYLE="font-size: 10pt">Executive Compensation and Related Information</FONT></A></TD>
    <TD STYLE="text-align: center"><A HREF="#a_007"><FONT STYLE="font-size: 10pt">16</FONT></A></TD></TR>
<TR STYLE="vertical-align: top; background-color: white">
    <TD STYLE="padding-left: 0.75in; text-indent: -0.75in"><A HREF="#a_008"><FONT STYLE="font-size: 10pt">Proposal 3 - Approve an Amendment to the ClearSign Combustion Corporation 2011 Equity Incentive Plan to Increase the Number of Shares of Common Stock Reserved for Awards</FONT></A></TD>
    <TD STYLE="text-align: center"><A HREF="#a_008"><FONT STYLE="font-size: 10pt">21</FONT></A></TD></TR>
<TR STYLE="vertical-align: top; background-color: #CCEEFF">
    <TD STYLE="padding-left: 0.75in; text-indent: -0.75in"><A HREF="#a_009"><FONT STYLE="font-size: 10pt">Proposal 4 &ndash; Approve an Amendment to Our Articles of Incorporation to Specify the Threshold of Shareholder Votes Required to Call a Special Meeting of Shareholders;</FONT></A></TD>
    <TD STYLE="text-align: center"><A HREF="#a_009"><FONT STYLE="font-size: 10pt">25</FONT></A></TD></TR>
<TR STYLE="vertical-align: top; background-color: white">
    <TD STYLE="padding-left: 0.75in; text-indent: -0.75in"><A HREF="#a_010"><FONT STYLE="font-size: 10pt">Proposal 5 &ndash; Approve, on an Advisory Basis, of the Compensation of our Named Executive Officers (&ldquo;Say-on-Pay&rdquo;)</FONT></A></TD>
    <TD STYLE="text-align: center"><A HREF="#a_010"><FONT STYLE="font-size: 10pt">26</FONT></A></TD></TR>
<TR STYLE="vertical-align: top; background-color: #CCEEFF">
    <TD><A HREF="#a_011"><FONT STYLE="font-size: 10pt">Proposal 6 - Approve Adjournment of the Annual Meeting to Solicit Additional Proxies</FONT></A></TD>
    <TD STYLE="text-align: center"><A HREF="#a_011"><FONT STYLE="font-size: 10pt">26</FONT></A></TD></TR>
<TR STYLE="vertical-align: top; background-color: white">
    <TD><A HREF="#a_012"><FONT STYLE="font-size: 10pt">Security Ownership of Certain Beneficial Owners and Management</FONT></A></TD>
    <TD STYLE="text-align: center"><A HREF="#a_012"><FONT STYLE="font-size: 10pt">27</FONT></A></TD></TR>
<TR STYLE="vertical-align: top; background-color: #CCEEFF">
    <TD><A HREF="#a_013"><FONT STYLE="font-size: 10pt">Certain Relationships and Related Transactions</FONT></A></TD>
    <TD STYLE="text-align: center"><A HREF="#a_013"><FONT STYLE="font-size: 10pt">28</FONT></A></TD></TR>
<TR STYLE="vertical-align: top; background-color: white">
    <TD><A HREF="#a_014"><FONT STYLE="font-size: 10pt">Requirements for Advance Notification of Nominations and Shareholder Proposals</FONT></A></TD>
    <TD STYLE="text-align: center"><A HREF="#a_014"><FONT STYLE="font-size: 10pt">30</FONT></A></TD></TR>
<TR STYLE="vertical-align: top; background-color: #CCEEFF">
    <TD><A HREF="#a_015"><FONT STYLE="font-size: 10pt">Other Matters</FONT></A></TD>
    <TD STYLE="text-align: center"><A HREF="#a_015"><FONT STYLE="font-size: 10pt">30</FONT></A></TD></TR>
<TR STYLE="vertical-align: top; background-color: white">
    <TD><A HREF="#a_016"><FONT STYLE="font-size: 10pt">Annex I &ndash; Amendment No. 1 to the ClearSign Combustion Corporation 2011 Equity Incentive Plan</FONT></A></TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; background-color: #CCEEFF">
    <TD><A HREF="#a_017"><FONT STYLE="font-size: 10pt">Annex II &ndash; Amendment to the Articles of Incorporation of ClearSign Combustion Corporation.</FONT></A></TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
</TABLE>

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


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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="text-transform: uppercase"><B><A NAME="a_001"></A>the
proxy procedure</B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">This proxy statement and the accompanying
proxy card are first being mailed on or about April , 2019 to owners of record of shares of common stock of ClearSign Combustion
Corporation (which may be referred to in this proxy statement as &ldquo;we,&rdquo; &ldquo;us,&rdquo; &ldquo;ClearSign,&rdquo; or
the &ldquo;Company&rdquo;) in connection with the solicitation of proxies by our board of directors (&ldquo;Board&rdquo;) for our
annual meeting of shareholders (the &ldquo;Annual Meeting&rdquo;) to be held on May 8, 2019 at 1:30 p.m. local time at our corporate
office at 12870 Interurban Avenue South, Seattle, Washington 98168. This proxy procedure permits all shareholders, many of whom
are unable to attend the Annual Meeting, to vote their shares at the Annual Meeting. Our Board encourages you to read this document
thoroughly and to take this opportunity to vote on the matters to be decided at the Annual Meeting.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="text-transform: uppercase"><B>IMPORTANT
NOTICE</B></FONT></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"><B>WHETHER OR NOT YOU PLAN TO ATTEND THE ANNUAL MEETING, WE
REQUEST THAT YOU MARK, DATE AND SIGN THE ENCLOSED PROXY CARD AND RETURN IT AS PROMPTLY AS POSSIBLE IN THE ENCLOSED ENVELOPE. SIGNING
AND RETURNING A PROXY WILL NOT PREVENT YOU FROM VOTING IN PERSON AT THE MEETING.</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>THANK YOU FOR ACTING PROMPTLY</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>IMPORTANT NOTICE REGARDING THE AVAILABILITY OF PROXY MATERIALS
FOR THE ANNUAL MEETING OF SHAREHOLDERS TO BE HELD ON MAY 8, 2019: The Notice of Annual Meeting, proxy statement and 2018 Annual
Report on Form 10-K are also available at www.clearsign.com, which does not have &ldquo;cookies&rdquo; that identify visitors
to the site.</B></P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="text-transform: uppercase"><B><A NAME="a_002"></A>About
The Meeting: Questions And Answers</B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>What am I voting on?</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-align: justify; text-indent: 0.5in">At this year&rsquo;s
meeting, you will be asked to:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.8in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.8in">(1)&nbsp;&nbsp;elect
five directors to serve until the election and qualification of their successors;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.8in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.8in">(2)&nbsp;&nbsp;approve,
on an advisory basis, the appointment of Gumbiner Savett Inc. as our independent registered public accounting firm for the year
ending December 31, 2019;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.8in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.8in">(3)&nbsp;&nbsp;&nbsp;approve
an amendment to the ClearSign Combustion Corporation 2011 Equity Incentive Plan to increase the number of shares of common stock
reserved for awards;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.8in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.8in">(4)&nbsp;&nbsp;approve
an amendment to our articles of incorporation to specify the threshold of shareholder votes required to call a special meeting
of shareholders;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.8in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.8in">(5)&nbsp;&nbsp;approve,
on an advisory basis, the compensation paid to our named executive officers; and</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.8in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.8in">(6)&nbsp;&nbsp;approve
one or more adjournments of the Annual Meeting to a later date or dates to solicit additional proxies if there are insufficient
votes to approve the amendment to the 2011 Equity Incentive Plan, approve the amendment to our articles of incorporation or in
the absence of a quorum.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Who is entitled to vote at the Annual Meeting, and how many
votes do they have?</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">Shareholders of record at the close of business
on March 8, 2019 (the &ldquo;Record Date&rdquo;) may vote at the Annual Meeting. Each share of our common stock has one vote. There
were 26,697,261 shares of common stock outstanding on March 8, 2019. From April 28, 2019 through May 7, 2019 (excluding weekends
and holidays), you may inspect, at our corporate office, a list of shareholders eligible to vote. If you would like to inspect
the list, please call Brian G. Fike, our interim Chief Financial Officer, at (206) 673-4848, to arrange a visit to our office.
In addition, the list of shareholders will be available for viewing by shareholders at the Annual Meeting.</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">You may vote over
the internet, by telephone, by mail or in person at the Annual Meeting. Please be aware that if you vote by telephone or over the
internet, you may incur costs such as telephone and internet access charges for which you will be responsible.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white"><B><I>Vote by Internet.</I></B>
You can vote via the internet at <I>www.proxyvote.com</I>. You will need to use the control number appearing on your proxy card
to vote via the internet. You can use the internet to transmit your voting instructions up until 11:59 p.m. Eastern Time on Tuesday,
April 16, 2019. Internet voting is available 24 hours a day. If you vote via the internet, you do not need to vote by telephone
or return a proxy card.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white"><B><I>Vote by Telephone.</I></B>
You can vote by telephone by calling the toll-free telephone number 1-800-690-6903. You will need to use the control number appearing
on your proxy card to vote by telephone. You may transmit your voting instructions from any touch-tone telephone up until 11:59&nbsp;p.m.
Eastern Time on Tuesday, April 16, 2019. Telephone voting is available 24 hours a day. If you vote by telephone, you do not need
to vote over the internet or return a proxy card.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white"><B><I>Vote by Mail
</I></B>If you received a printed proxy card, you can vote by marking, dating and signing it, and returning it in the postage-paid
envelope provided to ClearSign Combustion Corporation, c/o Broadridge, 51 Mercedes Way, Edgewood, New York 11717. Please promptly
mail your proxy card to ensure that it is received prior to the closing of the polls at the Annual Meeting.</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white"><B><I>Vote in Person
at the Meeting.</I></B> If you attend the Annual Meeting and plan to vote in person, we will provide you with a ballot at the Annual
Meeting. If your shares are registered directly in your name, you are considered the shareholder of record and you have the right
to vote in person at the Annual Meeting. If your shares are held in the name of your broker or other nominee, you are considered
the beneficial owner of shares held in street name. As a beneficial owner, if you wish to vote at the Annual Meeting, you will
need to bring to the Annual Meeting a legal proxy from your broker or other nominee authorizing you to vote those shares.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">If you vote by any of the methods discussed
above, you will be designating Colin James Deller, our Chief Executive Officer on the meeting date, and/or Brian G. Fike, our interim
Chief Financial Officer, Treasurer and Secretary, as your proxy(ies). They may act together or individually on your behalf, and
will have the authority to appoint a substitute to act as proxy.</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">Submitting a proxy will not affect your
right to attend the Annual Meeting and vote in person.</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">If your shares are held in the name of a
bank, broker or other nominee, you will receive separate voting instructions from your bank, broker or other nominee describing
how to vote your shares. The availability of internet voting will depend on the voting process of your bank, broker or other nominee.
Please check with your bank, broker or other nominee and follow the voting instructions it provides.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Can I receive future materials via the internet?</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">If you vote by internet, simply follow the
prompts for enrolling in electronic proxy delivery service. This will reduce the Company&rsquo;s printing and postage costs in
the future, as well as the number of paper documents you will receive.</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">A proxy is a person you appoint to vote
on your behalf. By using the methods discussed above, you will be appointing Colin James Deller, our Chief Executive Officer, and/or
Brian G. Fike, our interim Chief Financial Officer, Treasurer and Secretary, as your proxies. They may act together or individually
to vote on your behalf, and will have the authority to appoint a substitute to act as proxy. If you are unable to attend the Annual
Meeting, please vote by proxy so that your shares of common stock may be counted.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>How will my proxy vote my shares?</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">If
you are a shareholder of record, your proxy will vote according to your instructions. If you choose to vote by mail and complete
and return the enclosed proxy card but do not indicate your vote, your proxy will vote &ldquo;FOR&rdquo; the election of the directors-nominees
(see Proposal 1), &ldquo;FOR&rdquo; the approval, on an advisory basis, of Gumbiner Savett Inc. as our independent registered public
accounting firm for the year ending December 31, 2019 (see Proposal 2), &ldquo;FOR&rdquo; </FONT>approving <FONT STYLE="font-family: Times New Roman, Times, Serif">an
amendment to the ClearSign Combustion Corporation 2011 Equity Incentive Plan to increase the number of shares of common stock that
may be reserved for awards (see Proposal 3), &ldquo;FOR&rdquo; approving an amendment to our articles of incorporation to specify
the threshold of shareholder votes required to call a special meeting of shareholders (see Proposal 4); &ldquo;FOR&rdquo; approving,
on an advisory basis, of the compensation paid to our named executive officers (see Proposal 5) and &ldquo;FOR&rdquo; approving
one or more adjournments of the Annual Meeting to a later date or dates to solicit additional proxies if there are insufficient
votes to approve Proposal 3 and/or Proposal 4 or in the absence of a quorum (see Proposal 6).</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 do not intend to bring any other matter
for a vote at the Annual Meeting, and we do not know of anyone else who intends to do so, however, we will transact any such other
business as may properly come before the Annual Meeting or any adjournments thereof. <B><I>Your proxies are authorized to vote
on your behalf, using their best judgment, on any other business that properly comes before the Annual Meeting.</I></B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">If your shares are held in the name of a
bank, broker or other nominee (a &ldquo;Nominee&rdquo;), you will receive separate voting instructions from your Nominee describing
how to vote your shares. The availability of internet voting will depend on the voting process of your Nominee. Please check with
your Nominee and follow the voting instructions your Nominee provides.</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">You should instruct your Nominee how to
vote your shares. If you do not give voting instructions to the Nominee, the Nominee will determine if it has the discretionary
authority to vote on the particular matter. Under applicable rules, brokers have the discretion to vote on routine matters, such
as the ratification of the selection of an independent registered public account firm, but do not have discretion to vote on non-routine
matters. Under the regulations applicable to New York Stock Exchange member brokerage firms (many of whom are the record holders
of shares of our common stock), the uncontested election of directors is no longer considered a routine matter. Matters related
to executive compensation and to the implementation of, or a material revision to, an equity incentive plan are also not considered
routine. As a result, if you are a beneficial owner and hold your shares in street name, but do not give your Nominee instructions
on how to vote your shares with respect to Proposals 1, 3, 4 and 5, votes may not be cast on your behalf. If your Nominee indicates
on its proxy card that it does not have discretionary authority to vote on a particular proposal, your shares will be considered
to be &ldquo;broker non-votes&rdquo; with regard to that matter. Broker non-votes will be counted as present for purposes of determining
whether enough votes are present to hold our Annual Meeting, but a broker non-vote will not otherwise affect the outcome of a vote.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>How do I change my vote?</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">If you are a shareholder of record, you
may revoke your proxy at any time before your shares are voted at the Annual Meeting by:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">notifying our interim Chief Financial Officer, Treasurer and Secretary,
Brian G. Fike, in writing at 12870 Interurban Avenue South, Seattle, Washington 98168, that you are revoking your proxy;</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">submitting a proxy at a later date via the internet or telephone,
or by signing and delivering a proxy card relating to the same shares and bearing a later date than the date of the previous proxy
prior to the vote at the Annual Meeting, in which case your later-submitted proxy will be recorded, and your earlier proxy revoked;
or</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">attending and voting by ballot at the Annual Meeting.</FONT></TD></TR></TABLE>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">If your shares are held in the name of a
Nominee, you should check with your Nominee and follow the voting instructions provided by your Nominee.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Who will count the votes?</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our Secretary, Brian G. Fike, will act as
the inspector of election and count the votes, with the assistance of reports provided by Broadridge Shareholder Services.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>What constitutes a quorum?</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 holders of a majority of the Company&rsquo;s
eligible votes as of the Record Date, either present or represented by proxy, constitute a quorum. A quorum is necessary in order
to conduct the Annual Meeting. If you choose to have your shares represented by proxy at the Annual Meeting, you will be considered
part of the quorum. Both abstentions and broker non-votes are counted as present for the purpose of determining the presence of
a quorum. If a quorum is not present at the Annual Meeting, the shareholders present in person or by proxy may adjourn the meeting
to a later date. If an adjournment is for more than 30 days or a new record date is fixed for the adjourned meeting, we will provide
notice of the adjourned meeting to each shareholder of record entitled to vote at the meeting.</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>What vote is required to approve each proposal?</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B><I>Election of Directors</I></B>. For
Proposal 1, the election of directors, the nominees will be elected by a plurality of the votes of the shares of common stock present
in person or represented by proxy and entitled to vote at the Annual Meeting. You may choose to vote, or withhold your vote, separately
for each nominee. A properly executed proxy with voting instructions marked &ldquo;WITHHOLD&rdquo; with respect to the election
of one or more directors will not be voted with respect to the director or directors indicated, although it will be counted for
the purposes of determining whether there is a quorum.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B><I>Approval, on an Advisory Basis, of
the Appointment of Gumbiner Savett Inc. as the Company&rsquo;s Independent Registered Public Accounting Firm</I></B>. This is an
advisory vote only and not binding on the Company.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B><I>Approval of an Amendment to the ClearSign
Combustion Corporation 2011 Equity Incentive Plan to Increase the Number of Shares of Common Stock Reserved for Awards.</I></B>
Proposal 3 will be approved if a quorum is present and the affirmative vote of the holders of shares of common stock present in
person or represented by proxy and entitled to vote at the Annual Meeting exceeds the votes cast against Proposal 3.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B><I>Approval of an Amendment to our Articles
of Incorporation to Specify the Threshold of Shareholder Votes Required to call a Special Meeting of Shareholders.</I></B> Proposal
4 will be approved if a majority of the shares outstanding on the Record Date votes in favor of the proposal.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B><I>Approval, on an Advisory Basis, of
the Compensation Paid to our Named Executive Officers.</I></B> Proposal 5 is also an advisory vote only. This vote will not be
binding on us, our Board, or our Compensation Committee. However, the Board and the Compensation Committee will consider the outcome
of this vote when making future compensation decisions for our executive officers.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B><I>Approval of One or More Adjournments
of the Annual Meeting in Certain Circumstances.</I></B> Proposal 6 will be approved if a quorum is present and the affirmative
vote of the holders of shares of common stock present in person or represented by proxy and entitled to vote at the Annual Meeting
exceeds the votes cast against Proposal 6. If a quorum is not present at the Annual Meeting, Section 2, Subsection 2.8 of our bylaws
states that a majority of the votes represented may adjourn the Annual Meeting.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B><I>Other Proposals</I></B>. So long as
a quorum is present, in order to approve any other proposal that might properly come before the Annual Meeting, the affirmative
vote of the holders of shares of common stock entitled to vote must exceed the votes cast against the proposal, except when a different
vote is required by law or by our articles of incorporation.</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">Abstentions and broker non-votes with respect
to any matter will be counted as present and entitled to vote on that matter for purposes of establishing a quorum, but will not
be counted for purposes of determining the number of votes cast. Accordingly, abstentions and broker non-votes will have no effect
on the outcome of voting with respect to any of the proposals.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>What percentage of our common stock do our directors and
officers own?</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">As of March 8, 2019, our current directors
and executive officers beneficially owned approximately 29.2% of our common stock outstanding. See the discussion under the heading
&ldquo;Security Ownership of Certain Beneficial Owners and Management&rdquo; on page 29 for more details.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Who is soliciting proxies, how are they being solicited,
and who pays the cost?</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We, on behalf of our Board, through our
directors, officers, and employees, are soliciting proxies primarily by mail and the internet. Proxies may also be solicited in
person, by telephone, or facsimile. We will pay the cost of soliciting proxies. We will also reimburse stockbrokers and other custodians,
nominees, and fiduciaries for their reasonable out-of-pocket expenses for forwarding proxy and solicitation materials to the owners
of our common stock.</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Who is the independent registered public accounting firm,
and will they be represented at the Annual Meeting?</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">Gumbiner Savett Inc. served as the independent
registered public accounting firm auditing and reporting on our financial statements for the year ended December 31, 2018 and has
been appointed to serve as our independent registered public accounting firm for 2019. We expect that representatives of Gumbiner
Savett Inc. will not be present at the Annual Meeting.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>What are the recommendations of the Board?</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 recommendations of our Board are set
forth together with the description of each proposal in this proxy statement. In summary, the Board recommends a vote:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">FOR the election of the director nominees (see Proposal 1);</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">FOR the approval of Gumbiner Savett Inc. as our independent registered
public accounting firm for the year ending December 31, 2019 (see Proposal 2);</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">FOR the approval of an amendment to the ClearSign Combustion Corporation
2011 Equity Incentive Plan to increase the number of shares reserved for awards (see Proposal 3);</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">FOR the approval of an amendment to our articles of incorporation
to specify the threshold of shareholder votes required to call a special meeting of shareholders (see Proposal 4);</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">FOR the approval of the compensation paid to our named executive officers
(see Proposal 5); and</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">FOR the approval of one or more adjournments of the Annual Meeting
to a later date or dates to solicit additional proxies if there are insufficient votes to approve the amendment to the 2011 Equity
Incentive Plan, to approve an amendment to our articles of incorporation or in the absence of a quorum (see Proposal 6).</FONT></TD></TR></TABLE>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B><I>With respect to any other matter that
properly comes before the meeting, the proxy holders will vote as recommended by the Board or, if no recommendation is given, in
their own discretion.</I></B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">If you sign and return your proxy card but
do not specify how you want to vote your shares, the persons named as proxy holders on the proxy card will vote in accordance with
the recommendations of the Board.</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: center"><FONT STYLE="text-transform: uppercase"><B>&nbsp;</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="text-transform: uppercase"><B><A NAME="a_003"></A>Governance
of the Company</B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following table sets forth the names
and ages of the directors and executive officers serving immediately prior to the Annual Meeting. Our officers are appointed by,
and serve at the pleasure of, the Board.</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="width: 25%; text-align: center; border-bottom: Black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Name</B></FONT></TD>
    <TD STYLE="width: 2%; padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="width: 5%; text-align: center; border-bottom: Black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Age</B></FONT></TD>
    <TD STYLE="width: 2%; padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="width: 66%; text-align: center; border-bottom: Black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Position</B></FONT></TD></TR>
<TR>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Colin James Deller</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">51</FONT></TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Chief Executive Officer</FONT></TD></TR>
<TR>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Brian G. Fike</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">50</FONT></TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">interim Chief Financial Officer, Treasurer and Secretary</FONT></TD></TR>
<TR>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Donald W. Kendrick, Ph.D.</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">53</FONT></TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Chief Technology Officer</FONT></TD></TR>
<TR>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Stephen Sock</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">53</FONT></TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Senior Vice President, Business Development</FONT></TD></TR>
<TR>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Robert T. Hoffman Sr.</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">60</FONT></TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Director</FONT></TD></TR>
<TR>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Lon E. Bell, Ph.D.</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">78</FONT></TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Director</FONT></TD></TR>
<TR>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Susanne L. Meline</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">51</FONT></TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Director</FONT></TD></TR>
<TR>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Bruce A. Pate</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">61</FONT></TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Director</FONT></TD></TR>
<TR>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">James M. Simmons</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">70</FONT></TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Director</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our business, property and affairs are managed
by, or under the direction of, our Board, in accordance with the Washington Business Corporation Act and our bylaws. Members of
the Board are kept informed of our business through discussions with the Chief Executive Officer and other key members of management,
by reviewing materials provided to them by management, and by participating in meetings of the Board and its Committees.</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">Shareholders may communicate with the members
of the Board, either individually or collectively, or with any independent directors, individually or as a group, by writing to
the Board at 12870 Interurban Avenue South, Seattle, Washington 98168. These communications will be reviewed by the Corporate Secretary
who, depending on the subject matter, will (a) forward the communication to the director or directors to whom it is addressed or
who is responsible for the topic matter, (b) attempt to address the inquiry directly (for example, where it is a request for publicly
available information or a stock related matter that does not require the attention of a director), or (c) not forward the communication
if it is primarily commercial in nature or if it relates to an improper or irrelevant topic. At each meeting of the Nominating
and Corporate Governance Committee, the Corporate Secretary presents a summary of communications received and will make those communications
available to any director upon request.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Independence of Directors</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">In determining the independence of our directors,
we apply the definition of &ldquo;independent director&rdquo; provided under the listing rules of The Nasdaq Stock Market LLC (&ldquo;Nasdaq&rdquo;).
Pursuant to these rules, the Board concluded its annual review of director independence in February 2019. After considering all
relevant facts and circumstances, the Board affirmatively determined that all of the directors then serving on the Board, including
those nominated for election at the Annual Meeting, are independent within the meaning of Nasdaq Listing Rule 5605(a)(2) and Rule
10A-3(b) promulgated under the Securities Exchange Act of 1934, as amended (the &ldquo;Exchange Act&rdquo;), with the exception
of Robert T. Hoffman Sr.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Board Meetings and Committees of our Board </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 Board has three standing committees,
the Audit Committee, the Compensation Committee and the Nominating and Corporate Governance Committee, referred to in this proxy
statement as the &ldquo;Governance Committee.&rdquo; Ms. Meline is the Chairperson of the Audit Committee and the Board has determined
that she, together with Mr. Simmons, are audit committee financial experts, Mr. Pate is the Chairperson of the Compensation Committee
and Mr. Hoffman is the Chairperson of the Governance Committee. During the year ended December 31, 2018, the Board held 13 meetings,
the Audit Committee held four meetings, the Compensation Committee held seven meetings, and the Governance Committee held four
meetings. Each of our directors attended at least 75% of the aggregate of the total number of meetings held by the Board and the
Board Committee(s) of which he or she is a member. We do not have a policy with regard to Board attendance at the Annual Meeting.
All of the members of our Board attended the 2018 Annual Meeting.</P>

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


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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The Audit Committee operates pursuant to
a charter that can be viewed on our website at www.clearsign.com (under &ldquo;Investors-Corporate Governance-Governance Documents&rdquo;).
The role of the Audit Committee includes, but is not limited to, the following:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">oversee management&rsquo;s preparation of our financial statements
and management&rsquo;s conduct of the accounting and financial reporting processes;</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">appoint, compensate, retain and oversee the work of the independent
registered public accounting firm engaged for the purpose of preparing or issuing an audit report or performing other audit, review
or attest services for the Company;</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">oversee management&rsquo;s maintenance of internal controls and procedures
for financial reporting at least annually;</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">oversee our compliance with applicable legal and regulatory requirements,
including without limitation, those requirements relating to financial controls and reporting;</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">oversee the independent registered public accounting firm&rsquo;s
qualifications and independence;</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">prepare the report required by the rules of the Securities and Exchange
Commission to be included in our proxy statement; and</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">discharge such duties and responsibilities as may be required of the
Audit Committee by the provisions of applicable laws, rules or regulations. </FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The Audit Committee is authorized (without
seeking Board approval) to retain or terminate special legal, accounting or other advisors and may request any officer or employee
of the Company or the Company&rsquo;s outside counsel or independent registered public accounting firm to meet with any members
of, or advisors to, the Audit Committee. The Audit Committee has available appropriate funding from the Company, as determined
by the Audit Committee, for payment of compensation to any independent registered public accounting firm engaged for the purpose
of preparing or issuing an audit report or performing other audit, review or attest services for the Company; compensation to any
advisers employed by the Audit Committee; and ordinary administrative expenses of the Audit Committee that are necessary or appropriate
in carrying out its duties.</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The role of the Compensation Committee is
to:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">review, approve and recommend to the Board our compensation and benefit<FONT STYLE="color: #171717">s
</FONT>policies generally and the annual compensation (base salary, bonus and other benefits) for all of our executives, including
our Chief Executive Officer;</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">administer the ClearSign Combustion Corporation 2011 Equity Incentive
Plan and the 2013 Consultant Stock Plan; and</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">annually review and make recommendations to the Board with respect
to the compensation of non-executive directors<FONT STYLE="color: #191919">, </FONT>including any incentive plan compensation.</FONT></TD></TR></TABLE>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">A copy of the charter of the Compensation
Committee is available on our website at www.clearsign.com (under &ldquo;Investors-Corporate Governance-Governance Documents&rdquo;).</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The Compensation Committee may engage outside
advisers, including outside auditors, attorneys and consultants, as it deems necessary to discharge its responsibilities. The Compensation
Committee has sole authority to retain and terminate any compensation expert or consultant used to provide advice on compensation
levels or assist in the evaluation of director, Chief Executive Officer or senior executive compensation, including sole authority
to approve the fees of any expert or consultant and other retention terms. In addition, the Compensation Committee considers, but
is not bound by, the recommendations of our Chief Executive Officer with respect to the compensation packages of our other executive
officers.&nbsp;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Pursuant to the terms of the ClearSign Combustion
Corporation 2011 Equity Incentive Plan, the Compensation Committee may delegate to one or more officers of the Company the authority
to grant awards under the plan to participants who are not insiders of the Company. The Compensation Committee has delegated this
authority to the Chief Executive Officer for compensation for nonexecutives of the Company. The Compensation Committee maintains
the authority to grant the total award amount, and delegates authority to the Chief Executive Officer to distribute the award among
nonexecutive employees of the Company.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><I>Nominating and Corporate Governance Committee</I></B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The role of the Governance Committee is
to:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">evaluate from time to time the appropriate size (number of members)
of the Board and recommend any increase or decrease;</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">determine the desired skills and attributes of members of the Board,
taking into account the needs of the business and listing standards;</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">establish criteria for prospective members, conduct candidate searches,
interview prospective candidates, and oversee programs to introduce the candidate to us, our management, and operations;</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">review planning for succession to the positions of Chairperson of
the Board and Chief Executive Officer and other senior management positions;</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">annually recommend to the Board persons to be nominated for election
as directors;</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">recommend to the Board the members of all standing Committees;</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">adopt or develop for Board consideration corporate governance principles
and policies; and </FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD><FONT STYLE="font-family: Times New Roman, Times, Serif">periodically review and report to the Board on the effectiveness of
corporate governance procedures and the Board as a governing body, including conducting an annual self-assessment of the Board
and its standing committees. </FONT></TD></TR></TABLE>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">A copy of the charter of the Governance
Committee is available on our website at www.clearsign.com (under &ldquo;Investors-Corporate Governance-Governance Documents&rdquo;).
The members of the Governance Committee reviewed the qualifications of the director-nominees.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>Policy with Regard to Security Holder
Proposals and Director Recommendations</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">Shareholder proposals are reviewed by the
Corporate Secretary&rsquo;s office for compliance with the requirements for such proposals set forth in our Policy Regarding Shareholder
Candidates for Nomination and in Regulation 14a-8 of the Exchange Act. Shareholder proposals that meet these requirements will
be summarized by the Corporate Secretary&rsquo;s office. Summaries and copies of the shareholder proposals are circulated to the
Chairman of the Governance Committee.</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The Governance Committee will consider director
candidates recommended by shareholders. If a director candidate is recommended by a shareholder (a &ldquo;Nominating Shareholder&rdquo;),
the Governance Committee expects to evaluate such candidate in the same manner it evaluates director candidates it identifies.
A Nominating Shareholder must have <FONT STYLE="background-color: white">continuously held at least 5% of the Company&rsquo;s common
stock for at least three years by the date the name of the candidate is submitted, and must continue to hold the common stock through
the date of the annual meeting. A Nominating Shareholder</FONT> may submit one candidate for consideration at any annual meeting
of shareholders. A Nominating Shareholder must submit a candidate for consideration as a director in writing to the Company&rsquo;s
Secretary. The submission must be received by a date not later than the 120<SUP>th</SUP> calendar day before the anniversary of
the date that the prior year&rsquo;s annual meeting proxy statement was released to shareholders (or if the annual meeting date
has changed by more than 30 days, a reasonable time before we begin to print and mail the proxy statement) and must include the
following information:</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in">1.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The name,
address and number of shares of common stock owned by the Nominating Shareholder;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in">2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A representation
that the Nominating Shareholder meets the requirements described above and will continue to meet them through the date of the annual
meeting. If the Nominating Shareholder is not a registered holder of the Company&rsquo;s common stock, the Nominating Shareholder
must provide evidence of eligibility as provided in Exchange Act Rule 14a-8(b)(2).</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in">3.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A description
of all arrangements or understandings (whether written or oral) between or among the Nominating Shareholder and the candidate or
any other person or entity (naming such person or entity) regarding the candidate&rsquo;s nomination.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in">4.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All information
regarding the candidate that the Company would be required to disclose in a proxy statement filed pursuant to the rules and regulations
of the Securities and Exchange Commission with respect to a meeting at which the candidate would stand for election.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in">5.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Confirmation
that the candidate is independent under the independence requirements established by the Company, Rule 10A-3(b) promulgated under
the Exchange Act and Nasdaq Listing Rule 5605(a)(2), or if the candidate is not independent under all such criteria, a description
of the reasons why the candidate is not independent.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in">6.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The consent
of the candidate to serve as a member of the Company&rsquo;s board of directors, if nominated and elected.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in">7.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A representation
signed by the candidate that if elected he or she will:</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in">(i)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;represent
all shareholders of the Company in accordance with applicable laws and the Company&rsquo;s article of incorporation, bylaws and
other policies;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in">(ii)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;comply
with all rules, policies or requirements generally applicable to non-executive directors; and</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in">(iii)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;upon
request, complete and sign a customary director and officer questionnaire.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our Policy Regarding Shareholder Candidates
for Nomination is available on our website at www.clearsign.com (under &ldquo;Investors-Corporate Governance-Governance Documents&rdquo;).</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Director Qualifications and Diversity</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 Board seeks independent directors who
represent a diversity of backgrounds and experiences that will enhance the quality of the Board&rsquo;s deliberations and decisions.
Candidates should have substantial experience with one or more publicly traded companies or should have achieved a high level of
distinction in their chosen fields. The Board is particularly interested in maintaining a mix that includes individuals who are
active or retired executive officers and senior executives, particularly those with experience in combustion, technology, air pollution
control and air emission regulation, intellectual property, start-up companies, research and development, strategic planning, business
development, compensation, finance, accounting and banking.</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In evaluating nominations to the Board of
Directors, the Governance Committee also looks for certain personal attributes, such as integrity, ability and willingness to apply
sound and independent business judgment, comprehensive understanding of a director&rsquo;s role in corporate governance, availability
for meetings and consultation on Company matters, and the willingness to assume and carry out fiduciary responsibilities. The Governance
Committee took these specifications into account in formulating and re-nominating its present Board members. The current director
candidates were recommended by the Governance Committee, which is comprised of a majority of independent directors.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Compensation Committee Interlocks and Insider Participation
</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">Throughout 2018, Lon E. Bell (Chair) and
Scott P. Isaacson served on the Compensation Committee. Susanne Meline was appointed to the Compensation Committee in February
2018 and Jeffrey Ott resigned as a director and, in conjunction with his resignation, as a member of all Board Committees, including
the Compensation Committee, on October 1, 2018. Mr. Isaacson retired as a director and, in conjunction with his resignation, as
a member of all Board Committees, including the Compensation Committee, on January 24, 2019. Neither Dr. Bell, Mr. Ott, Ms. Meline
nor Mr. Isaacson has ever been an officer or employee of ours. None of our prior or current executive officers serves as a member
of the board of directors or compensation committee of any entity that has one or more executive officers serving as a member of
our Board or the Compensation Committee.</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We adopted a Code of Business Conduct and
Ethics (&ldquo;Code of Ethics&rdquo;) applicable to our principal executive officer and principal financial and accounting officer
and any persons performing similar functions. In addition, the Code of Ethics applies to our employees, officers, directors, agents
and representatives. The Code of Ethics requires, among other things, that our employees avoid conflicts of interest, comply with
all laws and other legal requirements, conduct business in an honest and ethical manner, and otherwise act with integrity and in
our best interest. The Code of Ethics is available on our website at www.clearsign.com (under &ldquo;Investors&rdquo;). <FONT STYLE="background-color: white">We
intend to satisfy the disclosure requirement regarding an amendment to, or a waiver from, a provision of our Code of Ethics that
applies to our principal executive officer, principal financial officer, principal accounting officer or controller, or persons
performing similar functions by posting the information on our internet website, www.clearsign.com.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>Risk Oversight by the Board of Directors</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">It is management&rsquo;s responsibility
to assess and manage the various risks we face. It is the Board&rsquo;s responsibility to oversee management in this effort, in
order to ensure that risks and uncertainties that may relate to our ongoing operations and to our plans for the future are considered
and managed appropriately. In exercising its oversight, the Board has allocated some areas of focus to its Committees and has retained
areas of focus for itself, as more fully described below.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Full Board</I> - Risks and exposures
focused on by the full Board include strategic, financial and execution risks and other current matters that may present material
risk to our operations, plans, prospects or reputation. Throughout the year, the Chief Executive Officer discusses these risks
with the Board during strategy reviews that focus on a particular function or aspect of our business.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Audit Committee</I> - Risks and exposures
focused on by the Audit Committee are those associated with financial matters, particularly financial reporting, tax, accounting,
disclosure, internal control over financial reporting, financial policies, investment guidelines, risk management as a whole and
credit and liquidity matters.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Governance Committee</I> - Risks and
exposures focused on by the Governance Committee are those relating to corporate governance and management and director succession
planning.</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Compensation Committee</I> - Risks and
exposures focused on by the Compensation Committee are those associated with leadership assessment and compensation programs and
arrangements, including incentive plans, to ensure that compensation incentives are aligned with our risk management objectives.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Board Leadership Structure </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 Chairperson of the Board presides at
all meetings of the Board. The Chairperson is appointed on an annual basis by at least a majority vote of the directors. At a special
meeting of the Board held on November 6, 2018, the Board determined to separate the offices of the Chief Executive Officer and
the Chairperson and appointed Mr. Hoffman as Chairperson of the Board while Stephen Pirnat, the Company&rsquo;s former Chief Executive
Officer, continued to fill that office. With the retirement of Mr. Pirnat, Mr. Hoffman is temporarily filling the position of interim
Chief Executive Officer from January 1, 2019 through March 31, 2019. The Board believes that this leadership structure increases
the Board&rsquo;s independence from management by allocating authority for operational leadership to the Chief Executive Officer
while allocating to the Board the responsibility for monitoring and overseeing management. The Board appointed Ms. Meline to the
role of lead independent director at a regular meeting held on February 7, 2019. As the lead independent director, Ms. Meline is
the liaison between Mr. Hoffman, as the Chairperson, and the other independent directors. We believe that having a lead independent
director will facilitate communication among the members of the Board.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><FONT STYLE="background-color: white"><B>Compliance
with Section 16 of the Exchange Act</B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="background-color: white">Based
solely upon a review of Forms 3, 4 and 5 furnished to the Company, the Company believes that, with the exception of the individual
and the entity named below, all of its directors, officers and beneficial owners of more than 10% of our equity securities timely
filed these reports during 2018.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in"><FONT STYLE="background-color: white">Roberto Ruiz,
the Company&rsquo;s former Chief Operating Officer, filed a Form 4 disclosing the grant of an option to purchase 20,000 shares
of the Company&rsquo;s common stock 10 days after the filing due date.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in"><FONT STYLE="background-color: white">GPclirSPV LLC
filed a Form 3 disclosing its indirect ownership of 5,213,543 shares of the Company&rsquo;s common stock 7 days after the filing
due date.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><FONT STYLE="text-transform: uppercase"><B><A NAME="a_004"></A>Proposal
1 &mdash; Election Of Directors</B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Nominees for Election</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 Board of Directors is comprised of five
members. Our Board, upon the recommendation of the Governance Committee, has nominated our five incumbent directors for re-election
at the Annual Meeting. Each nominee has agreed, if elected, to serve until the election and qualification of his or her successor.
If any nominee is unable to stand for election, which circumstance we do not anticipate, the Board may provide for a lesser number
of directors or designate a substitute. In the latter event, shares represented by proxies may be voted for a substitute nominee.</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">If a quorum is present at the Annual Meeting,
then nominees will be elected by a plurality of the votes cast. There is no cumulative voting in the election of directors.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following biographical information is
furnished as to each nominee for election as a director:</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Mr. Hoffman became
a director of our Company in July 2018 in conjunction with the execution of a Voting Agreement between the Company and clirSPV
LLC and was appointed as Chairman in November 2018. Mr. Hoffman has more than 30 years of relevant capital markets experience and
expertise. In 2011, Mr. Hoffman founded and continues to manage Princeton Opportunity Management LLC. Previously, he served as
founder and managing partner of Candlewood Capital, a long/short fund which managed more than $1 billion in primarily institutional
assets. Mr. Hoffman also was a Managing Director and Portfolio Manager for the Growth &amp; Income (G&amp;I) mutual fund and institutional
assets of what was originally Scudder Stevens and Clark, where he was responsible for all buy and sell decisions. During his tenure,
G&amp;I assets under management expanded from approximately $1.75 billion to more than $25 billion. Mr. Hoffman was also nominated
by two separate governors to serve three terms as a Member and Chairman of the State of New Jersey Investment Council (SIC) from
1990 to 2002. The SIC has ultimate oversight responsibility for state and local pension funds totaling more than $80 billion. Mr.
Hoffman's career also includes service as the Assistant State Treasurer for Pensions and Investments for the State of New Jersey,
Special Assistant to the Governor of New Jersey and Mergers, and Acquisitions Analyst at ABN/LaSalle Bank. He holds an M.B.A. with
Distinction from the Kellogg School of Management at Northwestern University and an Economics degree from Dartmouth College.</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Lon E. Bell, Ph.D.</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">Dr. Bell became a director of our Company
in November 2011. Since November 2012, he has been a member of the board of directors of Ideal Power Inc., a publicly traded reporting
company, and he was appointed as the Chief Executive Officer and President of Ideal Power Inc. on April 10, 2018. Dr. Bell founded
Gentherm Inc., formerly known as Amerigon Inc., in 1991 and was a consultant to Gentherm from December 2010 to December 2012. Dr.
Bell has served many roles at Gentherm, including Chief Technology Officer until December 2010, Director of Technology until 2000,
Chairman and Chief Executive Officer until 1999, and President until 1997. Dr. Bell served as the Chief Executive Officer and President
of BSST LLC, a subsidiary of Gentherm from September 2000 to December 2010. He served as a Director of Gentherm from 1991 to 2012.
Previously, Dr. Bell co-founded Technar Incorporated, which developed and manufactured automotive components, and served as Technar&rsquo;s
Chairman and President until selling majority ownership to TRW Inc. in 1986. Dr. Bell continued managing Technar, then known as
TRW Technar, as its President until 1991. He co-founded Mahindra REVA Electric Vehicle Pvt Ltd in 1994 and serves as a Director.
Since April 2014 he has been Chairman of the External Advisory Board to the Mechanical and Civil Engineering Department at the
California Institute of Technology. He has served as a director of CDTI Advanced materials (NASDAQ: CDTI) since 2013 and Chairman
since 2016. Dr. Bell co-founded CALSTART, a non-profit in 1991 and served as its first president. Dr. Bell is a leading expert
in the mass production of vehicle sensors and thermoelectric products. He has authored more than 20 publications in the areas of
thermodynamics of thermoelectric systems, automotive crash sensors, and other electronic and electromechanical devices. Five of
his inventions have gone into mass production and dominated their target markets. Dr. Bell received a BSc. in Mathematics, a MSc.
in Rocket Propulsion, and a Ph.D. in Mechanical Engineering from the California Institute of Technology. Dr. Bell&rsquo;s recognized
technological expertise in the field of thermodynamics and his demonstrated ability to commercialize inventions led us to conclude
that he should serve as a director.</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Ms. Meline has
been a director of our Company since February 2018. In 2003, Ms. Meline co-founded Francis Capital Management (&ldquo;FCM&rdquo;),
a value-based investment advisor, where she continues specialize in analyzing small cap stocks. Prior to co-founding FCM, Ms. Meline
worked as an investment banker with Houlihan Lokey, a global investment bank serving corporations, institutions, and governments
worldwide. She also practiced law in the corporate group of Jones Day, an international law firm that provides legal advisory services
across multiple disciplines and jurisdictions. Ms. Meline is a Certified Director through the UCLA Anderson School of Management,
a member of the National Association of Corporate Directors (the &ldquo;NACD&rdquo;) and holds a CERT Certificate in CyberSecurity
Oversight from the NACD and Carnegie Mellon University Software Engineering Institute . Ms. Meline received a B.A in political
science from UCLA, and a J.D. from the UC Hastings College of the Law. She served on the board of directors of Finomial Corporation,
a fintech company, until 2019.</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Mr. Pate joined our Company as a director
in January 2019. <FONT STYLE="color: #333333; background-color: white">Mr. Pate is the general partner of Pate Capital Partners
LP, which he founded in 2004 to invest in publicly traded companies with a special emphasis in energy and resource-related sectors.
Prior to founding Pate Capital Partners LP, Mr. Pate spent over 20 years at Morgan Stanley &amp; Co. as a principal of the firm,
where he managed fixed income and equity portfolios for entrepreneurs, foundations, and corporations.</FONT></P>

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


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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; color: #333333"><FONT STYLE="background-color: white">Mr.
Simmons joined our Company as a director in January 2019. He is the founder and Chief Investment Officer of ICM Asset Management,
an investment advisory firm founded in 1981. Mr. Simmons has been a Chartered Financial Analyst since 1985 and has over four decades
of experience in security analysis portfolio management. As ICM&rsquo;s Chief Investment Officer, he leads portfolio strategy for
all portfolios with a particular emphasis on undiscovered and turn-around smaller capitalized companies. In addition, Jim has been
active over the years in assisting small start-up companies in Spokane and the Northwest. As Chairman of the Board of ICM he also
provides the overarching strategic direction for the firm. Before founding ICM, Mr. Simmons served as the head of Old National
Bank&rsquo;s trust investment department, and prior to this, as a portfolio manager with the bank now known as Comerica. Mr. Simmons
earned a bachelor&rsquo;s degree in economics from Michigan State University, and is a member of both CFA Institute and the CFA
Society of Spokane.</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">The experience in investing that each of
Ms. Meline and Messrs. Hoffman, Pate and Simmons brings to our Board includes their experience in analyzing the operations of businesses,
and particularly smaller capitalized companies, to determine the likelihood of success. We believe that their experience, together
with the expertise brought to our operations by Colin James Deller, who transitioned from President to Chief Executive Officer
on April 1, 2019, will help us achieve our goals of proving commercial viability of our products, generating interest from end
users and original equipment manufacturers and licensing our technology. For these reasons we concluded that each of these individuals
should serve as a director.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">None of our director nominees is related
to any other director nominee or any officer. None of our director nominees has been involved in a legal proceeding that requires
disclosure pursuant to Item 401(f) of Regulation S-K promulgated under the Exchange Act. Mr. Hoffman was selected as a director
pursuant to the terms of a Voting Agreement we entered into with clirSPV LLC in July 2018. Messrs. Pate and Simmons were selected
as directors pursuant to the terms of the Cooperation Agreement we entered into with Anthony DiGiandomenico and his affiliates
in January 2019.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Director Compensation for 2018</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following table sets forth information
concerning compensation for services rendered by our non-executive directors for 2018. The amounts represented in the &ldquo;Stock
Awards&rdquo; column reflect the stock compensation expense recorded by the Company and does not necessarily equate to the income
that will ultimately be realized by the director for such awards.</P>

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

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP STYLE="font-weight: bold; text-align: left; border-bottom: Black 1pt solid"><FONT STYLE="font-size: 10pt">Name</FONT></TD><TD STYLE="font-weight: bold; padding-bottom: 1pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid"><FONT STYLE="font-size: 10pt">Fees
    Earned<BR> or Paid in <BR> Cash</FONT></TD><TD STYLE="font-weight: bold; padding-bottom: 1pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid"><FONT STYLE="font-size: 10pt">Stock
    <BR> Awards</FONT></TD>
    <TD NOWRAP STYLE="padding-bottom: 1pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="padding-bottom: 1pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="font-weight: bold; padding-bottom: 1pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid"><FONT STYLE="font-size: 10pt">Option<BR>
    &nbsp;Awards</FONT></TD><TD STYLE="font-weight: bold; padding-bottom: 1pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="font-weight: bold; padding-bottom: 1pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid"><FONT STYLE="font-size: 10pt">Non-Equity<BR>
    Incentive Plan <BR> Compensation</FONT></TD><TD STYLE="font-weight: bold; padding-bottom: 1pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid"><FONT STYLE="font-size: 10pt">Nonqualified<BR>
    Deferred<BR>
    Compensation<BR> Earnings</FONT></TD><TD STYLE="font-weight: bold; padding-bottom: 1pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="font-weight: bold; padding-bottom: 1pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid"><FONT STYLE="font-size: 10pt">All
    Other<BR> Compensation</FONT></TD><TD STYLE="font-weight: bold; padding-bottom: 1pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid"><FONT STYLE="font-size: 10pt">Total</FONT></TD><TD STYLE="font-weight: bold; padding-bottom: 1pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD NOWRAP COLSPAN="2" STYLE="text-align: right"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD NOWRAP COLSPAN="2" STYLE="text-align: right"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD NOWRAP STYLE="text-align: right"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD NOWRAP COLSPAN="2" STYLE="text-align: right"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD NOWRAP COLSPAN="2" STYLE="text-align: right"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD NOWRAP COLSPAN="2" STYLE="text-align: right"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD NOWRAP COLSPAN="2" STYLE="text-align: right"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD NOWRAP COLSPAN="2" STYLE="text-align: right"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD NOWRAP STYLE="width: 24%; text-align: left; padding-left: 0in"><FONT STYLE="font-size: 10pt">Lon E. Bell</FONT></TD><TD STYLE="width: 1%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">$</FONT></TD><TD STYLE="width: 8%; text-align: right"><FONT STYLE="font-size: 10pt">50,000</FONT></TD><TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">$</FONT></TD><TD STYLE="width: 8%; text-align: right"><FONT STYLE="font-size: 10pt">50,000</FONT></TD>
    <TD STYLE="width: 2%; text-align: right"><FONT STYLE="font-size: 10pt">(1</FONT></TD><TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">)</FONT></TD><TD STYLE="width: 1%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">$</FONT></TD><TD STYLE="width: 8%; text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="width: 1%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">$</FONT></TD><TD STYLE="width: 8%; text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="width: 1%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">$</FONT></TD><TD STYLE="width: 8%; text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="width: 1%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">$</FONT></TD><TD STYLE="width: 8%; text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="width: 1%"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">$</FONT></TD><TD STYLE="width: 8%; text-align: right"><FONT STYLE="font-size: 10pt">100,000</FONT></TD><TD STYLE="width: 1%; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD NOWRAP STYLE="text-align: left"><FONT STYLE="font-size: 10pt">Scott P. Isaacson</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">50,000</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">50,000</FONT></TD>
    <TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">(2</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">)</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">100,000</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD NOWRAP STYLE="text-align: left"><FONT STYLE="font-size: 10pt">Jeffrey L. Ott</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">37,500</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">37,500</FONT></TD>
    <TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">(3</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">)</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">75,000</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD NOWRAP STYLE="text-align: left"><FONT STYLE="font-size: 10pt">Susanne Meline</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">50,000</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">50,000</FONT></TD>
    <TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">(4</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">)</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">100,000</FONT></TD><TD STYLE="text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD NOWRAP STYLE="text-align: left; padding-bottom: 1pt"><FONT STYLE="font-size: 10pt">Robert T. Hoffman</FONT></TD><TD STYLE="padding-bottom: 1pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1pt solid; text-align: right"><FONT STYLE="font-size: 10pt">25,000</FONT></TD><TD STYLE="padding-bottom: 1pt; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1pt solid; text-align: right"><FONT STYLE="font-size: 10pt">25,000</FONT></TD>
    <TD STYLE="padding-bottom: 1pt; text-align: right"><FONT STYLE="font-size: 10pt">(5</FONT></TD><TD STYLE="padding-bottom: 1pt; text-align: left"><FONT STYLE="font-size: 10pt">)</FONT></TD><TD STYLE="padding-bottom: 1pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1pt solid; text-align: right"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="padding-bottom: 1pt; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="padding-bottom: 1pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1pt solid; text-align: right"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="padding-bottom: 1pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1pt solid; text-align: right"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="padding-bottom: 1pt; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="padding-bottom: 1pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1pt solid; text-align: right"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="padding-bottom: 1pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="border-bottom: Black 1pt solid; text-align: right"><FONT STYLE="font-size: 10pt">50,000</FONT></TD><TD STYLE="padding-bottom: 1pt; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD NOWRAP STYLE="padding-bottom: 2.5pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="padding-bottom: 2.5pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left"><FONT STYLE="font-size: 10pt">$</FONT></TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right"><FONT STYLE="font-size: 10pt">212,500</FONT></TD><TD STYLE="padding-bottom: 2.5pt; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left"><FONT STYLE="font-size: 10pt">$</FONT></TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right"><FONT STYLE="font-size: 10pt">212,500</FONT></TD>
    <TD STYLE="padding-bottom: 2.5pt; text-align: right"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="padding-bottom: 2.5pt; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="padding-bottom: 2.5pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left"><FONT STYLE="font-size: 10pt">$</FONT></TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="padding-bottom: 2.5pt; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="padding-bottom: 2.5pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left"><FONT STYLE="font-size: 10pt">$</FONT></TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="padding-bottom: 2.5pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left"><FONT STYLE="font-size: 10pt">$</FONT></TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="padding-bottom: 2.5pt; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD><TD STYLE="padding-bottom: 2.5pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left"><FONT STYLE="font-size: 10pt">$</FONT></TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right"><FONT STYLE="font-size: 10pt">-</FONT></TD><TD STYLE="padding-bottom: 2.5pt"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left"><FONT STYLE="font-size: 10pt">$</FONT></TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right"><FONT STYLE="font-size: 10pt">425,000</FONT></TD><TD STYLE="padding-bottom: 2.5pt; text-align: left"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify"><TD STYLE="width: 0.25in; text-align: left">(1)</TD><TD STYLE="text-align: justify">Since his appointment as a director, Dr. Bell has received
grants of 99,693 shares of common stock as compensation for his services.</TD>
</TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in; text-align: left">(2)</TD><TD STYLE="text-align: justify">During his tenure as a director, Mr Isaacson received grants
of 99,693 shares of common stock as compensation for his services. Mr. Isaacson
resigned as a director on January 24, 2019.</TD>
</TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in; text-align: left">(3)</TD><TD STYLE="text-align: justify">During his tenure as a director, Mr. Ott received grants
of 69,034 shares of common stock as compensation for his services Mr. Ott resigned
as a director on October 1, 2018.</TD>
</TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in; text-align: left">(4)</TD><TD STYLE="text-align: justify">Since her appointment as a director, Ms Meline has received
grants of 27,027 shares of common stock for her services</TD>
</TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in; text-align: left">(5)</TD><TD STYLE="text-align: justify">Since his appointment as a director, Mr Hoffman has received
grants of 13,514 shares of common stock for his services</TD>
</TR></TABLE>





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


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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In 2018, each non-executive director&rsquo;s
annual compensation in the amount of $100,000 was paid 50% in cash and 50% in common stock. <FONT STYLE="background-color: white">The
number of shares of common stock issued was calculated by using the last sale price of the common stock on May 3, 2018, the date
of the grant.</FONT> The common stock is subject to a right of repurchase by the Company at $0.0001 per share through May 3, 2019
if the director terminates service or certain other designated events occurred.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The equity component of the Company&rsquo;s
director compensation program is designed to build an ownership stake in the Company while conveying an incentive to directors
relative to the returns recognized by our shareholders.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">All directors are reimbursed for ordinary
and reasonable expenses incurred in exercising their responsibilities in accordance with the Company&rsquo;s expense reimbursement
procedure applicable to all employees 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">Other than the 2011 Equity Incentive Plan,
the independent directors are not eligible to participate in the Company&rsquo;s employee benefit plans, including the retirement
plan.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Vote Required and Recommendation</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 affirmative vote of the holders of a
plurality of the shares of common stock present in person or represented by proxy and entitled to vote on the nominees will be
required to approve each nominee. This means that the nominees receiving the most votes for election will be elected.</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>The Board unanimously recommends a vote
&ldquo;FOR&rdquo; each of the nominees.</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="text-transform: uppercase"><B><A NAME="a_005"></A>Report
of the Audit Committee</B></FONT></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">The following Report of the Audit Committee
shall not be deemed incorporated by reference into any of our filings under the Securities Act of 1933 or the Exchange Act, except
to the extent we specifically incorporate it by reference therein.</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 Audit Committee of the Board has:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.8in; text-indent: -10.35pt">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif">reviewed
and discussed the Company&rsquo;s audited financial statements for the year ended December 31, 2018 with management;</FONT></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.8in; text-indent: -10.35pt">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif">discussed
with the Company&rsquo;s independent auditors the matters required to be discussed by Auditing Standard No. 1301, <I>Communications
with Audit Committees</I>, issued by the Public Company Accounting Oversight Board; and</FONT></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.8in; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in; text-align: left"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif">received
the written disclosures and letter from the independent auditors required by the applicable requirements of the Public Accounting
Oversight Board regarding the independent auditors communications with the Audit Committee concerning independence, and has discussed
with the independent auditor the independent auditor's independence.</FONT></TD>
</TR></TABLE>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In reliance on the review and discussions
referred to above, the Audit Committee recommended to the Board that the financial statements audited by Gumbiner Savett Inc. for
the year ended December 31, 2018 be included in its Annual Report on Form 10-K for such fiscal year.</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: 100%; font-size: 10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Audit Committee of the Board </FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Susanne Meline, Chairperson</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Lon E, Bell, Ph.D.</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">James M. Simmons</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="text-transform: uppercase"><B><A NAME="a_006"></A>Proposal
2 &ndash; APPROVE, ON AN ADVISORY BASIS, of THE Appointment<BR>
of Independent Registered Public Accounting Firm </B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The Audit Committee of the Board has appointed
Gumbiner Savett Inc. as our independent registered public accounting firm to audit our financial statements for the year ending
December 31, 2019. Gumbiner Savett Inc. has served as our independent registered public accounting firm since 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">Shareholder approval of the selection of
Gumbiner Savett Inc. as our independent registered public accounting firm is advisory only and is not required by our bylaws or
the Washington Business Corporation Act. The Board seeks such approval as a matter of good corporate practice. Should the shareholders
fail to approve the selection of Gumbiner Savett Inc. as our independent registered public accounting firm, the Board will reconsider
whether to retain that firm in the future. In making its recommendation to the Board that shareholders ratify the appointment of
Gumbiner Savett Inc. as our independent registered public accounting firm for the year ending December 31, 2019, the Audit Committee
considered whether Gumbiner Savett Inc.&rsquo;s provision of non-audit services is compatible with maintaining its independence.
The Audit Committee approved the audit fees, audit-related fees, tax fees and all other fees described below and believes such
fees are compatible with the independence of Gumbiner Savett Inc.</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP>&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">2018</TD><TD STYLE="padding-bottom: 1pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">2017</TD><TD STYLE="padding-bottom: 1pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 74%; text-align: left">Audit Fees</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 10%; text-align: right">57,000</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 10%; text-align: right">57,000</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Audit Related Fees</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Tax Fees</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">5,375</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">All Other Fees</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">21,912</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">24,298</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
</TABLE>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><I>Audit Fees.</I> &ldquo;Audit Fees&rdquo;
are the aggregate fees of Gumbiner Savett Inc. attributable to professional services rendered in 2018 and 2017 for the audit of
our annual financial statements and for review of financial statements included in our quarterly reports on Form 10-Q and for services
that are normally provided by Gumbiner Savett Inc. in connection with statutory and regulatory filings or engagements for those
fiscal years.</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>Tax Fees.</I> &ldquo;Tax Fees&rdquo;
are the aggregate fees of Gumbiner Savett Inc. billed for professional services rendered to us for tax compliance, tax advice,
and tax planning.</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>All Other Fees.</I> &ldquo;All Other
Fees&rdquo; are the aggregate fees of Gumbiner Savett Inc. attributable to customary agreed upon professional services in connection
with the underwritten sale of our common stock in February 2018 and review of our 2018 and 2017 proxy statements.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Pre-approval Policies and Procedures</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 Audit Committee is required to review
and approve in advance the retention of the independent registered public accounting firm for the performance of all audit and
lawfully permitted non-audit services and the fees for such services. The required pre-approval policies and procedures were complied
with during 2018 and 2017.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Gumbiner Savett Inc. Representatives at Annual Meeting</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We expect that representatives of Gumbiner
Savett Inc. will not be present at the Annual Meeting.</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">This is an advisory vote and does not require
a minimum number of votes.</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>The Board unanimously recommends you
vote &ldquo;FOR&rdquo; approval of the appointment of Gumbiner Savett Inc. as our independent registered public accounting firm
for the year ending December 31, 2019.</B></P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><A NAME="a_007"></A><FONT STYLE="text-transform: uppercase"><B>Executive
Compensation and Related Information</B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following is biographical information
about our executive officers.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Colin James Deller, Ph.D., Chief Executive Officer</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Dr. Deller joined
us as our President in February 2019 and transitioned to the office of Chief Executive Officer on April 1, 2019. Dr. Deller began
his career at Hamworthy Combustion while also completing his Ph.D. In 1996, Dr. Deller joined Callidus, where he was employed in
Project Engineering and Sales, and over the course of ten years advanced to serve as Chief Combustion Engineer and Manager of Burner
Order Execution before being promoted to oversee Callidus&rsquo; entire burner business. From 2010 until he left Callidus, following
the acquisition of Callidus by Honeywell, Dr. Deller served as General Manager with full profit and loss accountability for the
Honeywell UOP Callidus burner business worldwide. During that time, he led his team in developing new international markets, including
developing a leading market position in China. From May 2018 until he joined the Company, Dr. Deller served as the interim Global
Operations Director for the entire Honeywell International UOP Callidus business, which includes flares and thermal oxidizers in
addition to burners.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Dr. Deller has
a Bachelor of Engineering in mechanical engineering from Portsmouth Polytechnic, U.K., a doctorate in flame chemistry from the
University of Portsmouth, U.K., and an MBA from The University of London.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Brian G. Fike, interim Chief Financial Officer, Treasurer
and Secretary </B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Mr. Fike was appointed as our Controller
in January 2016 and as our interim Chief Financial Officer, Secretary and Treasurer in May 2017. Prior to joining the Company,
from March 2001 to January 2016, Mr. Fike was employed by Darigold, Inc., a $2.3 billion dairy manufacturing co-op of 500 member
farmers, where he successively held the positions of Plant Controller, Accounting and Finance Manager, Strategy Manager and Regional
Controller. Prior to his career at Darigold, Mr. Fike held similar positions in the specialty foods and industrial automation industries.
Mr. Fike also served eight years in the U.S. Naval Reserve.</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">Mr. Fike holds a BBA in Accountancy from
Boise State University and an MBA from the University of Washington.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Donald W. Kendrick, Ph.D., Chief Technology Officer </B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Dr. Kendrick joined the Company in May 2015
as our Senior Vice President of Technology and was promoted to Chief Technology Officer in August 2016. Prior to joining ClearSign,
Dr. Kendrick was CTO of Lean Flame, Inc. from January 2008 to April 2015. Prior to that, he was Operations Manager for United Technologies
Corporation&rsquo;s Pratt &amp; Whitney PulseDyne Division and Senior Manager at the United Technologies Corporate Research Center
(UTRC). He has also served as the Aerothermal Department Head of Ramgen Power Systems, Director of Research at Imperium Renewables
and President of Gaidheal Consulting, LLC. Dr. Kendrick&rsquo;s areas of expertise include engineering research and development
and product commercialization in the areas of combustion, ultra-low emissions systems, renewal energy, biofuels, power generation
and gas turbines (aero and industrial). He is widely published, holds a number of issued patents in his area of expertise and serves
as a reviewer for several journals including Combustion and Flame and Combustion Science and Technology.</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: 10pt Times New Roman, Times, Serif">Dr.
Kendrick holds a B.A.Sc. degree in Mechanical Engineering (Honours) from the University of British Columbia and both a MSc. and
Ph.D. degree in Mechanical Engineering from the California Institute of Technology</FONT>.</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Stephen M. Sock, Senior Vice President, Business Development</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="background-color: white">Mr.
Sock joined the Company in July 2017 as Senior Vice President, Business Development. Prior to joining the Company, Mr. Sock spent
25 years in the process plants industry, the majority with Amec Foster Wheeler, where he was employed from July 1991 through July
2016 and then briefly, from May 2017 through July 2017, with Burrow Global Engineering &amp; Construction. During his career at
Amec Foster Wheeler, Mr. Sock was employed in various capacities of increasing responsibility including Sales &amp; Marketing Coordinator,
Business Development Manager, Proposal Manager, Estimating Department Manager, Proposal Department Manager, Director Technology
Business Development and ultimately Vice President Commercial Operations. Mr. Sock has extensive experience interacting with global
customers in the process plants industries involving technology licensing, product and service sales, proposal preparation and
contract negotiation. Through this experience, Mr. Sock has as strong understanding of how clients in these industries make complicated
purchasing decisions. He joined Foster Wheeler as a Process Engineer directly from Lehigh University, where he studied Chemical
Engineering.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">None of our executive officers is related
to any of our directors or any other officer. None of our executive officers has been involved in a legal proceeding that requires
disclosure pursuant to Item 401(f) of Regulation S-K promulgated under the Exchange Act. None of our officers was selected as such
as a result of an arrangement or understanding between him and any other person.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>Summary Compensation Table for 2018
and 2017</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The table below summarizes the total compensation
paid to or earned by our Chief Executive Officer and our two most highly compensated executive officers other than our Chief Executive
Officer, referred to herein as the &ldquo;named executive officers&rdquo; or &ldquo;NEOs,&rdquo; in 2018 and 2017. The amounts
represented in the &ldquo;Option Awards&rdquo; column reflects the stock compensation expense recorded by the Company pursuant
to ASC Topic 718 and does not necessarily equate to the income that will ultimately be realized by the named executive officers
for such awards.</P>

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

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

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Name
    and</B></FONT><BR> <FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Principal Position</B></FONT></TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Year</TD><TD STYLE="padding-bottom: 1pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Salary</TD><TD NOWRAP STYLE="padding-bottom: 1pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Bonus</TD><TD NOWRAP STYLE="padding-bottom: 1pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Option</B></FONT><BR>
    <FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Awards (1)</B></FONT></TD><TD STYLE="padding-bottom: 1pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>All
    Other</B></FONT><BR> <FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Compensation (2<FONT STYLE="font-style: normal">)</FONT></B></FONT></TD><TD STYLE="padding-bottom: 1pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Total</TD><TD STYLE="padding-bottom: 1pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP>&nbsp;</TD><TD>&nbsp;</TD>
    <TD NOWRAP COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD NOWRAP COLSPAN="2">&nbsp;</TD><TD NOWRAP>&nbsp;</TD><TD>&nbsp;</TD>
    <TD NOWRAP COLSPAN="2">&nbsp;</TD><TD NOWRAP>&nbsp;</TD><TD>&nbsp;</TD>
    <TD NOWRAP COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD NOWRAP COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD NOWRAP COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 34%; font-weight: bold; text-align: left">Stephen E. Pirnat</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 8%; text-align: right">2018</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 8%; text-align: right">350,000</TD><TD NOWRAP STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 8%; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">0</FONT></TD><TD NOWRAP STYLE="width: 1%; text-align: left">(3)</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 8%; text-align: right">18,640</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 8%; text-align: right">30,611</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 8%; text-align: right">399,251</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">President, Chief Executive Officer</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">2017</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">350,000</TD><TD NOWRAP STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">165,000</FONT></TD><TD NOWRAP STYLE="text-align: left">(4)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">92,269</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">29,884</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">637,153</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD NOWRAP STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD NOWRAP STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font-weight: bold; text-align: left">Roberto Ruiz</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">2018</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">300,000</TD><TD NOWRAP STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">0</FONT></TD><TD NOWRAP STYLE="text-align: left">(3)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">55,923</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">25,361</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">381,284</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Chief Operating Officer</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">2017</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">270,833</TD><TD NOWRAP STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">0</FONT></TD><TD NOWRAP STYLE="text-align: left">(4)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">65,654</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">24,106</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">360,593</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD NOWRAP STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD NOWRAP STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font-weight: bold; text-align: left">Donald W. Kendrick</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">2018</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">200,000</TD><TD NOWRAP STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">38,771</FONT></TD><TD NOWRAP STYLE="text-align: left">(3)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">51,915</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">28,819</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">319,505</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Chief Technology Officer</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">2017</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">198,750</TD><TD NOWRAP STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">90,000</FONT></TD><TD NOWRAP STYLE="text-align: left">(4)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">42,215</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">26,503</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">357,468</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD NOWRAP STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD NOWRAP STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font-weight: bold; text-align: left">Manuel Menendez</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">2018</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">218,242</TD><TD NOWRAP STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">58,231</FONT></TD><TD NOWRAP STYLE="text-align: left">(3)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">17,360</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">22,937</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">316,770</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">President, ClearSign Asia</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">2017</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">40,252</FONT></TD><TD NOWRAP STYLE="text-align: left">(5)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">25,000</FONT></TD><TD NOWRAP STYLE="text-align: left">(4)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">18,443</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">2,737</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">86,432</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
</TABLE>


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(1) The amounts included in this column are the aggregate dollar
amounts of compensation expense recognized by us for financial statement reporting purposes in accordance with Accounting Standards
Codification 718, Compensation-Stock Compensation, and includes amounts from option awards granted in 2018, 2017, 2016, and 2015.
For information on the valuation assumptions used in calculating these dollar amounts, see Notes 2 and 8 to our financial statements
in our Annual Report on Form 10-K for the year ended December 31, 2018. These amounts reflect our accounting expense for these
awards and do not correspond to the actual value that may be recognized by the individuals upon option exercise.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(2) Relates to healthcare benefits and employer matching in
a defined contribution retirement plan available to all employees.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(3) Bonuses for 2018 were accrued in 2018 and paid in March
of 2019.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(4) Bonuses for 2017 were accrued in 2017 and paid in April,
2018</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(5) Mr. Menendez was hired in October of 2017.</P>

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


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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following table sets forth information
concerning outstanding equity awards held by our NEO&rsquo;s at December 31, 2018.</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER" STYLE="border-collapse: collapse; width: 85%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Name</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Number of<BR> Securities<BR> Underlying<BR> Unexercised<BR> Options<BR> (#) Exercisable</TD><TD STYLE="padding-bottom: 1pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Equity Incentive<BR> Plan Awards:<BR> Number of<BR> Securities<BR> Underlying<BR> Unexercised <BR>
Unearned Options<BR> (#) Unexercisable</TD><TD STYLE="padding-bottom: 1pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Option<BR> Exercise<BR> Price ($)</TD><TD STYLE="padding-bottom: 1pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Option <BR>
Expiration <BR>
Date</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP>&nbsp;</TD><TD>&nbsp;</TD>
    <TD NOWRAP COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD NOWRAP COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD NOWRAP COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD NOWRAP>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 48%; font-weight: bold; text-align: left">Stephen E. Pirnat</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">18,750</FONT></TD><TD STYLE="width: 1%; text-align: left">(1)</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">11,250 </FONT></TD><TD STYLE="width: 1%; text-align: left">(1)</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 10%; text-align: right">4.21</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 12%; text-align: center">3/31/2026</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">200,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">5.21</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">3/31/2025</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">100,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">5.97</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">2/2/2025</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font-weight: bold; text-align: left">Donald W. Kendrick</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">1,875</FONT></TD><TD STYLE="text-align: left">(2)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">28,125</FONT></TD><TD STYLE="text-align: left">(2)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">1.90</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">3/31/2028</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">9,375</FONT></TD><TD STYLE="text-align: left">(3)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">15,625</FONT></TD><TD STYLE="text-align: left">(3)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">3.80</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">3/31/2027</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">15,625</FONT></TD><TD STYLE="text-align: left">(1)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">9,375</FONT></TD><TD STYLE="text-align: left">(1)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">4.21</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">3/31/2026</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">22,500</FONT></TD><TD STYLE="text-align: left">(4)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">2,500</FONT></TD><TD STYLE="text-align: left">(4)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">5.07</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">3/31/2025</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="font-weight: bold; text-align: left">Roberto Ruiz</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">1,250</FONT></TD><TD STYLE="text-align: left">(2)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">18,750</FONT></TD><TD STYLE="text-align: left">(2)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">1.90</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">3/31/2028</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">3,750</FONT></TD><TD STYLE="text-align: left">(3)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">6,250</FONT></TD><TD STYLE="text-align: left">(3)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">3.80</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">3/31/2027</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">31,250</FONT></TD><TD STYLE="text-align: left">(1)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">18,750</FONT></TD><TD STYLE="text-align: left">(1)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">4.21</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">3/31/2026</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">17,500</FONT></TD><TD STYLE="text-align: left">(5)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">2,500</FONT></TD><TD STYLE="text-align: left">(5)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">5.21</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">3/31/2025</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">11,500</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">9.90</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">12/31/2023</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">30,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">4.88</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">12/31/2022</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font-weight: bold; text-align: left">Manuel Menendez</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">1,250</FONT></TD><TD STYLE="text-align: left">(2)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">18,750</FONT></TD><TD STYLE="text-align: left">(2)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">1.90</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">03/31/28</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">20,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">-</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">$</TD><TD STYLE="text-align: right">3.10</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: center">11/1/2027</TD></TR>
</TABLE>


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 4.65pt">(1) Unearned options vest 6.25% on July 1, 2016 and
on the first day of each calendar quarter thereafter until fully vested on April 1, 2020. In the event of a change in control of
the Company, the unvested options becomely fully vested. At December 31, 2018, these options have vested 62.5%.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 4.65pt">(2) Unearned options vest 6.25% on July 1, 2018 and
on the first day of each calendar quarter thereafter until fully vested on April 1, 2022. In the event of a change in control of
the Company, the unvested options becomely fully vested. At December 31, 2018, these options have vested 6.25%.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 4.65pt">(3) Unearned options vest 6.25% on July 1, 2017 and
on the first day of each calendar quarter thereafter until fully vested on April 1, 2021. In the event of a change in control of
the Company, the unvested options becomely fully vested. At December 31, 2018, these options have vested 37.5%.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 4.65pt">(4) Unearned options vested at the rate of 40% on
April 1, 2016 and ontinue to vest at the rate of 5% on the first day of each calendar quarter thereafter until they are fully vested
on April 1, 2019. At December 31, 2018, 90% of these options were vested.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 4.65pt">(5) Unearned options vest 6.25% on July 1, 2015 and
on the first day of each calendar quarter thereafter until fully vested on April 1, 2019. In the event of a change in control of
the Company, the unvested options becomely fully vested. At December 31, 2018, these options have vested 87.5%.</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Employment Contracts and Termination of Employment and Change-in-Control
Arrangements</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><I>Employment Agreement with Stephen E. Pirnat</I></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Effective February 3, 2015 we entered into
an employment agreement with Stephen E. Pirnat, our former Chief Executive Officer. Unless earlier terminated, the agreement was
to continue until December 31, 2017 however, on October 30, 2017 we extended the term of the agreement to December 31, 2018. Mr.
Pirnat retired on December 31, 2018, at which time the agreement expired.</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">Mr. Pirnat's annual salary was $350,000 with a cost-of-living
adjustment made to the annual salary at the beginning of each calendar year of the term, although Mr. Pirnat waived the right to
receive this adjustment for the years 2016, 2017 and 2018. Pursuant to the agreement, the Compensation Committee could grant an
annual bonus to Mr. Pirnat, which could equal up to 60% of his annual salary, based on performance standards and goals achieved
by him.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In conjunction with the employment of Mr.
Pirnat in 2015, the Company also issued two stock option awards, pursuant to the ClearSign Combustion Corporation 2011 Equity Incentive
Plan, for the purchase of 100,000 shares of common stock at an exercise price of $5.97 per share and for the purchase of 200,000
shares of the Company&rsquo;s common stock at an exercise price of $5.21 per share. The term of each option is 10 years. The option
for the purchase of 100,000 shares vested entirely on February 3, 2016. The option for the purchase of 200,000 shares vested 50%
on April 1, 2016 and the remaining 50% vested on April 1, 2017.</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">Mr. Pirnat was entitled to receive a relocation
allowance, including moving expenses in an amount not to exceed $24,000, closing costs relating to the sale of his residence in
Oklahoma in an amount not to exceed $40,000 and six months of living expenses following his move to Seattle, Washington, which
did not exceed $6,300 per month. Total relocation costs incurred were $39,150.</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">According to the agreement, Mr. Pirnat&rsquo;s employment could
be terminated for cause, as defined in the agreement, due to his death or disability, by the election of the Company or Mr. Pirnat,
or as a result of a change in control, as defined in the agreement. If the agreement was terminated as a result of Mr. Pirnat&rsquo;s
death, disability or by his election, Mr. Pirnat was entitled to receive accrued but unpaid annual salary, the value of unused
paid time off through the effective date of termination, accrued but unpaid annual bonus, if any, and business expenses incurred
prior to the effective date of termination. If we terminated the agreement without cause, Mr. Pirnat was entitled to receive accrued
but unpaid annual salary and the value of accrued but unused vacation pay through the effective date of the termination, accrued
but unpaid annual bonus, if any, business expenses incurred prior to the effective date of termination and an amount equal to the
greater of (A) his annual salary, less legal deductions, for a period of the remaining number of months in the initial term of
his employment agreement, or (B) his annual salary, less legal deductions. At his expense, Mr. Pirnat would have also been entitled
to continue to participate in employee benefit plans for a period of 12 months following termination of his employment. Additionally,
Mr. Pirnat would have been entitled to immediate accelerated vesting of all unvested options granted under the agreement or, if
applicable, lapse of the Company&rsquo;s right to repurchase common stock purchased prior to vesting. If his employment was terminated
as a result of a change of control, Mr. Pirnat would have received accrued but unpaid annual salary and the value of accrued but
unused vacation pay through the effective date of the termination, accrued but unpaid annual bonus less legal deductions and, if
any, business expenses incurred prior to the effective date of termination and an amount equal to his annual salary. Additionally,
Mr. Pirnat would have been entitled to immediate accelerated vesting of all unvested options granted under the agreement or, if
applicable, lapse of the Company&rsquo;s right to repurchase common stock purchased prior to vesting.</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><I>Offer of Employment to Manuel C. Menendez III</I></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">On October 18, 2017, the Company and Manuel
C. Menendez III executed a letter outlining the terms of Mr. Menendez&rsquo;s employment (the &ldquo;offer letter&rdquo;) pursuant
to which we agreed to employ Mr. Menendez as President of ClearSign Asia Limited, our subsidiary. Pursuant to the offer letter,
we pay Mr. Menendez an annual salary of $202,656. We also granted to Mr. Menendez an option to purchase 20,000 shares of our common
stock at an exercise price of $3.10 per share and we agreed to grant to Mr. Menendez shares of common stock in ClearSign Asia Limited
equal to 1% of its business value up to a maximum of $500,000, once a valuation is established. No valuation of ClearSign Asia
Limited has been established and no shares in ClearSign Asia Limited have been issued to Mr. Menendez. If Mr. Menendez&rsquo;s
employment is terminated for any reason, ClearSign Asia Limited will have a period of 60 days to purchase the shares from Mr. Menendez
at their fair market value as determined by an independent third party. We may terminate Mr. Menendez&rsquo;s employment at will,
but if we terminate his employment without cause, as defined in the offer letter, or if Mr. Menendez terminates his employment
for good reason, as defined in the offer letter, aside from paying him his accrued but unpaid salary, paid-time-off and bonus,
if any, we would also be required to pay him one year&rsquo;s salary. Mr. Menendez is also entitled to continue to participate,
at his expense, in any employee benefits for a period on one year (to the extent provided in such plans for terminated employees).</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><I>Employment Agreement with Colin James Deller</I></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">For information about the employment agreement
we entered into with Mr. Deller, please see the section of this proxy statement titled &ldquo;Certain Relationships and Related
Transactions.&rdquo;</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">All of the option awards and stock awards
granted to the Company&rsquo;s executive officers include change-in-control arrangements whereby any unvested stock options would
vest or any repurchase rights for stock grants or, if exercised prior to vesting, stock options, would terminate as a result of
a change in control.</P>

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

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

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The Compensation Committee of the Board
administers our executive compensation and benefit programs. The Compensation Committee is comprised exclusively of independent
directors and oversees all compensation and benefit programs and actions that affect our executive officers.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B><I>Compensation Process and Role of
Management</I></B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The Compensation Committee is responsible
for determining and approving all compensation for our executive officers. Pursuant to its charter, the Compensation Committee
recommends to the full Board the salary, annual incentive compensation or bonus, long-term incentive compensation in the form of
stock options or stock grants, and all other employment, severance and change-in-control agreements applicable to executive officers.
As discussed below, our Chief Executive Officer assists the Compensation Committee in its deliberations with respect to the compensation
payable to our other executive officers.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Following the end of each fiscal year, our
Chief Executive Officer evaluates executive officer performance for the prior fiscal year, other than his own performance, and
discusses the results of such evaluations with the Compensation Committee. The Chief Executive Officer assesses each executive
officer&rsquo;s performance for the prior fiscal year based upon subjective factors concerning such officer&rsquo;s individual
business goals and objectives, and the contributions made by the executive officer to our overall results. The Chief Executive
Officer then makes specific recommendations to the Compensation Committee for adjustments to base salary and the grant of a target
bonus and/or equity award, if appropriate, as part of the compensation package for each executive officer, other than himself,
for the next fiscal year. For the fiscal year ended December 31, 2018, the evaluations were performed by Mr. Hoffman, our interim
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">The Compensation Committee reviews the performance
of the Chief Executive Officer and determines all compensation for the Chief Executive Officer. The Chief Executive Officer is
not present at the time the Compensation Committee reviews his performance and discusses his compensation.</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"><B><I>Evaluation of Compensation Practices</I></B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In 2017, the Compensation Committee engaged
Willis Towers Watson to evaluate both our executive compensation program and our director compensation program. The objective was
to determine the equity and competitiveness of our practices with those of peer companies and relevant standards promulgated by
shareholder rights organizations and other relevant stakeholders. Although the study analyzed executive compensation comprehensively,
there was particular focus on equity incentives for executives. The Compensation Committee integrated the results of the May 2017
study into its evaluation of executive compensation and director compensation for the years 2018 and 2019. Willis Towers Watson
provided no other services to us following the evaluation. The Compensation Committee is currently reviewing compensation trends
to further evaluate current compensation levels for executives and directors.</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="a_008"></A>PROPOSAL 3 &ndash; APPROVE AN AMENDMENT
TO THE</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>CLEARSIGN COMBUSTION CORPORATION 2011
EQUITY INCENTIVE PLAN TO INCREASE THE NUMBER OF SHARES OF COMMON STOCK RESERVED FOR AWARDS</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">On January 27, 2011, our Board and our shareholders
approved the ClearSign Combustion Corporation 2011 Equity Incentive Plan (the &ldquo;Plan&rdquo;). The Plan provides for the granting
of awards to officers, employees, directors, consultants and advisors. The Compensation Committee of the Board is authorized to
administer the Plan and establish the award terms, including the grant price, vesting period and exercise 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; background-color: white">Competition is
intense in our industry for highly skilled officers and employees. We believe that the Plan has been effective in attracting and
retaining highly qualified employees and other key contributors to our business, and that the awards granted under the Plan have
provided an incentive that aligns the economic interests of Plan participants with those of our shareholders. We believe that the
Plan provides a flexible and effective source of incentive compensation and, for that reason, our Board believes that it is in
the best interests of the Company and our shareholders to reserve a sufficient number of shares of our common stock in the Plan
to allow the Company to continue to make awards from the Plan.</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 Plan currently reserves 2,772,246 shares
of our common stock for awards, which represents approximately 10% of the number of shares of our common stock outstanding. From
this reserve, we have granted awards covering a total of 2,031,256 shares of common stock. This means that we currently have only
740,990 shares of common stock available in the reserve for future awards. The Plan includes an &ldquo;evergreen&rdquo; provision
that is triggered if we issue shares of our common stock during a quarter. In that event, we may add to the Plan reserve a number
of shares equal to the lesser of 10% of any new shares issued by the Company during the quarter immediately prior to the adjustment
date or such lesser amount as the Board shall determine.</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">On March 11, 2019, our Board adopted an
amendment to the Plan (the &ldquo;Amendment&rdquo;) that (i) increases the number of shares of common stock in the reserve by 1,231,593
shares, to a total of 4,003,839 shares of common stock, representing approximately 15% of the number of shares of our common stock
outstanding and (ii) increases the number of shares issued pursuant to the evergreen provision, if any, to the lesser of 15% of
any new shares issued by the Company during the quarter immediately prior to the adjustment date or such lesser amount as the Board
shall determine.</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">If our shareholders approve the Amendment,
the number of total shares in the reserve (4,003,839) will not increase thereafter unless and until we issue additional shares
of common stock or we again amend the Plan. Pursuant to Section 3.2 of the Plan, if we were to issue additional shares of common
stock during a quarter, the reserve would increase by a number equal to 15% of the newly issued shares. As an example, if during
the quarter ended June 30, 2019 we issued 100,000 shares of our common stock in a private offering, the Plan reserve would be increased
by 15,000 shares so that the reserve would total 4,018,839 shares of common stock.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The Amendment, a copy of which is included
as Annex I to this proxy statement, provides that Sections 3.1 and 3.2 of the Plan will read as follows:</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in; background-color: white">3.1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Number
of Shares Available</U>. Subject to Sections 3.2, 3.3 and 18, the total aggregate number of Shares reserved and available for grant
and issuance pursuant to this Plan, shall be 4,003,839 Shares and will include Shares that are subject to: (a) issuance upon exercise
of an Option but cease to be subject to such Option for any reason other than exercise of such Option; (b) an Award granted hereunder
but forfeited or repurchased by the Company at the original issue price; and (c) an Award that otherwise terminates without Shares
being issued. At all times the Company shall reserve and keep available a sufficient number of Shares as shall be required to satisfy
the requirements of all outstanding Options granted under this Plan and all other outstanding but unvested Awards granted under
this Plan.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in; background-color: white">3.2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Increase
in Number of Shares Available</U>. The maximum aggregate number of Shares that may be granted under the Plan will be increased
effective the first day of each of the Company&rsquo;s fiscal quarters, beginning with the fiscal quarter commencing April 1, 2019,
(the &ldquo;Adjustment Date&rdquo;) by an amount equal to the lesser of:</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: 0.5in; background-color: white">(i)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;15%
of the difference between the number of shares of Common Stock outstanding on the applicable Adjustment Date and the number of
shares of Common Stock outstanding at the beginning of the fiscal quarter immediately preceding the Adjustment Date; or</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: 0.5in; background-color: white">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: 0.5in; background-color: white">(ii)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;such
lesser number of Shares as may be determined by the Board.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="background-color: white">We
are required by Nasdaq Listing Rule 5635(c) to obtain shareholder approval of the Amendment.</FONT></P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following is a summary of the principal
features of the Plan. The summary is qualified in its entirety by reference to the complete text of the Plan, including the Amendment.</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">Persons eligible to receive awards from
the Plan include employees (including officers) of the Company and its affiliates, consultants who provide significant services
to the Company or its affiliates and directors of the Company or its affiliates (the &ldquo;Participants&rdquo;). As of the Record
Date, we had 17 employees and consultants, five executive officers (including Mr. Hoffman as interim Chief Executive Officer) and
four non-executive directors, all of whom are eligible to receive awards from the Plan. As of April 1, 2019, Mr. Hoffman will resign
as our interim Chief Executive Officer, and he will become the fifth non-executive director who will be eligible to receive awards
from the Plan. The Plan permits the Company to issue to Participants, as defined in the Plan, qualified and/or non-qualified options
to purchase shares of our common stock, awards of common stock and common stock bonuses. The Plan will terminate on January 26,
2021. The Compensation Committee of the Board is responsible for administration of the Plan and has the sole discretion to determine
which Participants will be granted awards and the terms and conditions of the awards granted. The Plan may be amended by the Board<FONT STYLE="background-color: white">,
however, the Board may not, without the approval of our shareholders, amend this Plan in any manner that requires such shareholder
approval.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">The exercise price
of stock options granted from the Plan is determined by the Compensation Committee when the option is granted and may be not less
than 85% of the fair market value of a share of the Company&rsquo;s common stock on the date of grant; provided that the exercise
price of an incentive stock option will be not less than 100% of the fair market value of a share of the Company&rsquo;s common
stock on the date of grant and the exercise price of an option granted to a Participant who owns securities representing more than
10% of the voting power outstanding (a &ldquo;10% Holder&rdquo;) will not be less than 110% of the fair market value of a share
of the Company&rsquo;s common stock on the date of grant. The fair market value of common stock <FONT STYLE="background-color: white">that
is publicly traded and listed on a national securities exchange or on Nasdaq is defined in the Plan as the official closing price
of the common stock on the date of determination</FONT>. No option can have a term that is longer than 10 years; an incentive stock
option granted to a 10% Holder cannot have a term that is longer than 5 years. Following the termination of a Participant&rsquo;s
employment for a reason other than death or disability, an outstanding option will terminate three months following the Participant&rsquo;s
separation from service. If a Participant&rsquo;s employment is terminated as a result of death or disability, an outstanding option
will terminate one year following the Participant&rsquo;s separation from service. Upon the exercise of any option, the exercise
price will be payable to us in full in cash or, where expressly approved for the Participant by the Compensation Committee and
where permitted by law: (i) by cancellation of indebtedness of the Company to the Participant; (ii) by surrender of shares that
either: (1) have been owned by the Participant for more than six months and have been paid for within the meaning of Rule 144;
or (2) were obtained by the Participant in the public market; (iii) by waiver of compensation due or accrued to the Participant
for services rendered; (iv) through a &ldquo;same day sale&rdquo; commitment from the Participant and a broker-dealer that is a
member of the Financial Industry Regulatory Authority (a &ldquo;FINRA Dealer&rdquo;) whereby the Participant irrevocably elects
to exercise the option and to sell a portion of the shares so purchased to pay for the exercise price, and whereby the FINRA Dealer
irrevocably commits upon receipt of such shares to forward the exercise price directly to the Company, or through a &ldquo;margin&rdquo;
commitment from the Participant and a FINRA Dealer whereby the Participant irrevocably elects to exercise the option and to pledge
the shares so purchased to the NASD Dealer in a margin account as security for a loan from the FINRA Dealer in the amount of the
exercise price, and whereby the FINRA Dealer irrevocably commits upon receipt of the shares to forward the exercise price directly
to the Company; or (v) by any combination of the foregoing.</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white"><FONT STYLE="background-color: white">A
stock award is an offer by the Company to sell to a Participant common stock that may or may not be subject to restrictions. The
Compensation Committee determines to whom an offer will be made, the number of shares the Participant may purchase, the price to
be paid</FONT>, <FONT STYLE="background-color: white">the restrictions to which the shares will be subject, if any, and all other
terms and conditions of the stock award. A stock bonus is an award of common stock for services rendered to the Company (or to
any parent or subsidiary of the Company). A Stock Bonus may be awarded for general excellence of service or upon satisfaction of
such performance goals as are set out in advance in the Participant&rsquo;s individual award agreement.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">As of the Record
Date, the fair market value of a share of our common stock was $0.94.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The table below provides information as
of December 31, 2018 regarding the Plan.</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP STYLE="font-weight: bold; border-bottom: Black 1pt solid">Plan Category</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Number of securities
    to<BR> be issued upon exercise<BR>  of outstanding options<BR>
 &nbsp;(a)</TD><TD STYLE="padding-bottom: 1pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Weighted-average exercise <BR>
price of outstanding options<BR>
(b)</TD><TD STYLE="padding-bottom: 1pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Number of securities remaining available<BR>
for future issuance under equity<BR>
 compensation plans (excluding securities<BR>
 reflected in column a)<BR>
(c)</TD><TD STYLE="padding-bottom: 1pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 61%; text-align: left">Equity compensation plans approved by security holders</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; text-align: right">2,768,618</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">$</TD><TD STYLE="width: 10%; text-align: right">4.32</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; text-align: right">1,296,462</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-bottom: 1pt">Equity compensation plans not not approved by security holders</TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; text-align: right">-</TD><TD STYLE="padding-bottom: 1pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">2,768,618</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">$</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">4.32</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">1,296,462</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The above table excludes vested stock grants
of 591,879 shares made pursuant to the 2011 Equity Incentive Plan.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Federal Income Tax Consequences of the Issuance and Exercise
of Stock Options</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following discussion is only a general
overview of the tax effects of awards of stock options. It is not a comprehensive discussion or analysis of the tax effect of an
award granted to any individual Participant. It is the responsibility of a Participant who receives an award from the Plan to consult
with his or her tax advisor to determine the tax effects of the grant of any award to him or her.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><I>Non-Statutory Stock Options</I></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Under the current provisions of the Internal
Revenue Code, if shares of common stock are issued to the original holder of a non-qualified option granted and exercised under
the Plan (assuming there is not an active trading market for options of the Company), the Participant will not recognize income
at the time of the grant of the option. However, on exercise of the option and purchase of the common stock, the Participant will
recognize ordinary income in an amount equal to the excess of the fair market value of the shares of common stock acquired at the
time of exercise over the exercise price. Furthermore, upon the sale of the shares of common stock the Participant will recognize
a short-term or long-term capital gain, or loss, as the case may be, in an amount equal to the difference between the amount the
Participant received from the sale of those shares and the Participant&rsquo;s tax basis in the shares (as described below). Finally,
we will be entitled to expense as compensation the amount of ordinary income that the holder recognized.</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">If the Participant pays the exercise price
entirely in cash, the tax basis of the shares of common stock will be equal to the amount of the exercise price paid plus the ordinary
income recognized by the Participant from exercising the options. This basis should equal the fair market value of the shares of
common stock acquired 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">The ordinary income received by the Participant
on exercise of the option is considered to be compensation from the Company. As with other forms of compensation, withholding tax
and other trust fund payments will be due with respect to the exercise of the options.</P>

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


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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The rule stated above is different when
there has been an acquisition of our common stock pursuant to the exercise of an incentive stock option. The rules governing incentive
stock options prevent the taxation of the options as income to the Participant at the time the option is granted or at the time
the Participant exercises the option and buys the stock. The Participant incurs tax (which is at capital gains rates) only at the
time of the sale of the stock the Participant purchased by exercising the option. However, in order to take advantage of the special
tax treatment, there are certain restrictions relating to incentive stock options that must be met. The employee must have an option
to receive shares of the corporation employing him, its parent or its subsidiary. The option must be granted within 10 years from
the date that the plan is adopted by the Board of Directors or approved by the shareholders, whichever is earlier. Further, the
option granted must be exercisable within 10 years from the date it is granted (five years in the case of a 10% Holder). The option
exercise price may not be less than the fair market value of the stock at the time the option is granted (110% of the fair market
value in the case of a 10% Holder), and the option may not be transferred other than by death. The option may be exercised only
by the employee (unless the employee dies, in which case his executor, administrator or representative would be entitled to exercise).
The employee must remain an employee of the corporation from the time the option is granted until three months before the option
is exercised. Once the stock has been purchased by exercise of the incentive option, it cannot be sold within two years from the
date the option was granted or within one year from the date the option was exercised and the stock was purchased, whichever is
later.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 10pt; text-indent: -10pt"><B>Aggregate Past Grants Under
the Plan</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">As of March 1, 2019, awards covering 2,031,256
shares of the Company&rsquo;s common stock had been issued from the Plan. The following table shows information regarding the distribution
of those awards among the persons and groups identified below as of that date.</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Name and Title</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Number of<BR>
Shares Subject<BR>
 to Past Option<BR>
 Awards</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="6" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Number of Shares Underlying<BR>
 Options</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Number of<BR>
 Shares Subject<BR>
 to Past Stock<BR>
 Awards</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP STYLE="text-align: justify; padding-bottom: 1pt"><B>&nbsp;</B></TD><TD STYLE="padding-bottom: 1pt"><B>&nbsp;</B></TD>
    <TD NOWRAP COLSPAN="2" STYLE="text-align: justify; padding-bottom: 1pt"><B>&nbsp;</B></TD><TD STYLE="padding-bottom: 1pt"><B>&nbsp;</B></TD><TD STYLE="padding-bottom: 1pt"><B>&nbsp;</B></TD>
    <TD NOWRAP COLSPAN="2" STYLE="text-align: center; border-bottom: Black 1pt solid"><B>Exercisable</B></TD><TD STYLE="padding-bottom: 1pt"><B>&nbsp;</B></TD><TD STYLE="padding-bottom: 1pt"><B>&nbsp;</B></TD>
    <TD NOWRAP COLSPAN="2" STYLE="text-align: center; border-bottom: Black 1pt solid"><B>Nonexercisable</B></TD><TD STYLE="padding-bottom: 1pt"><B>&nbsp;</B></TD><TD STYLE="padding-bottom: 1pt"><B>&nbsp;</B></TD>
    <TD NOWRAP COLSPAN="2" STYLE="text-align: justify; padding-bottom: 1pt"><B>&nbsp;</B></TD><TD STYLE="padding-bottom: 1pt"><B>&nbsp;</B></TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP>&nbsp;</TD><TD>&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="text-align: center">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD NOWRAP COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD NOWRAP COLSPAN="2">&nbsp;</TD><TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="text-align: center">&nbsp;</TD><TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 48%; text-align: left">Stephen E. Pirnat, former Chief Executive Officer</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; text-align: right">330,000</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; text-align: right">320,625</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; text-align: right">9,375</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; text-align: right">74,586</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Brian G. Fike, interim Chief Financial Officer</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">190,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">96,146</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">93,854</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Roberto Ruiz, former Chief Operating Officer</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">141,500</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">102,750</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">38,750</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">20,833</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Donald W. Kendrick, Chief Technology Officer</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">265,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">150,834</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">114,166</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">20,833</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Manuel Menendez, President, ClearSign Asia, Limited</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">145,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">58,750</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">86,250</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Stephen Sock, Senior Vice President, Business Development</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">120,000</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">37,084</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">82,916</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">All current and former executive officers as a group</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1,191,500</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">766,189</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">425,311</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">116,252</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">All current non-executive directors</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Robert T. Hoffman Sr., director nominee</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">13,514</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Lon E. Bell, director nominee</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">99,693</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Susanne Meline, director nominee</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">27,027</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Bruce A. Pate, director nominee</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">James M. Simmons, director nominee</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">All other employees</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">247,877</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">118,066</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">139,811</TD><TD STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">335,393</TD><TD STYLE="text-align: left">&nbsp;</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"><B>&nbsp;</B></P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Proposal 3 will be approved if a quorum
is present and the affirmative vote of the holders of shares of common stock present in person or represented by proxy and entitled
to vote at the Annual Meeting exceeds the votes cast against Proposal 3.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>The Board unanimously recommends you
vote FOR the approval of the amendment to the ClearSign Combustion Corporation 2011 Equity Incentive Plan.</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="a_009"></A>PROPOSAL 4 &ndash; APPROVE AN AMENDMENT
TO OUR ARTICLES OF INCORPORATION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>TO SPECIFY THE THRESHOLD OF SHAREHOLDER
VOTES REQUIRED</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>TO CALL A SPECIAL MEETING OF SHAREHOLDERS</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Our Board is proposing
that our shareholders approve an amendment to our articles of incorporation (the &ldquo;Articles Amendment&rdquo;) adding a provision
that requires at least 20% of shareholder votes to call a special meeting. This amendment will be accompanied by an amendment to
our bylaws decreasing the threshold of shareholder votes required to call a special meeting from 25% to 20% (the &ldquo;Bylaws
Amendment&rdquo;). The Articles Amendment, if approved, together with the Bylaws Amendment, will eliminate the discrepancy between
the requirements of the Washington Business Corporation Act and our bylaws relating to the threshold required to call a special
meeting. A copy of the Articles Amendment is included as Annex II to this proxy statement.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white"><I>The reasons for this proposal.</I></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Our bylaws state
at Section 2, Subsection 2.2, that &ldquo;A special meeting of the shareholders shall be held if the holders of at least 25% of
all the votes entitled to be cast on any issue proposed to be considered at the special meeting have delivered to the Secretary
one or more demands . . . .&rdquo; Our articles of incorporation, however, do not address the voting requirement for a special
meeting. As a result, under the Washington Business Corporation Act &ldquo;[t]<FONT STYLE="background-color: white">he right of
shareholders of a public company to call a special meeting may be limited or denied to the extent provided in the articles of incorporation.&rdquo;
The discrepancy between the Washington Business Corporation Act and our bylaws may confuse shareholders wanting to call a special
meeting. Therefore, we want our articles of incorporation and our bylaws to set forth the same standard so that shareholders know
the percentage threshold they must have before making a demand that the Company hold a special meeting.</FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">The Board seeks
to lower the standard set forth in the bylaws to 20% and conform the articles of incorporation accordingly as it believes that
a 20% ownership threshold for the right to call a special meeting strikes a reasonable and appropriate balance between (i) providing
shareholders with a meaningful right to call a special meeting while (ii) also protecting the interests of all shareholders, taking
into consideration the Company&rsquo;s small size, negative cash flow and limited cash reserves, by avoiding the unnecessary use
of resources in the event a small minority of shareholders with limited support for their proposed actions, including those with
interests unique to their individual situation, could call special meetings especially as there are other avenues for shareholders
to communicate with the Board and the Company outside of calling a special meeting. Our Board is committed to shareholder engagement
and efficient response to shareholder concerns and, after careful consideration, believes that the proposal to add the Articles
Amendment setting forth a 20% threshold for holders of our common stock to call a special meeting and reducing the threshold set
forth in the bylaws from 25% to 20%, is in the best interests of ClearSign and its shareholders.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Our Board further
recognizes that good governance dictates that the Board should be refreshed from time to time to allow for fresh and diverse perspectives,
new experience and to meet the changing needs of the Company. To this end, our Board intends to adopt a policy that will require,
subject to certain exceptions such as a contractual requirement or the ability to extend an individual director&rsquo;s term limit
to meet the Board&rsquo;s fiduciary duties, that a member leave the Board after serving for seven consecutive years.</P>

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


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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Proposal 4 will be approved if a majority
of the shares outstanding on the Record Date votes in favor of the proposal.</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>The Board unanimously recommends you
vote &ldquo;FOR&rdquo; approval of the Articles Amendment.</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in"><B><A NAME="a_010"></A>PROPOSAL 5 &ndash;
APPROVE, ON AN ADVISORY BASIS, OF THE COMPENSATION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in"><B>OF OUR NAMED EXECUTIVE
OFFICERS (&ldquo;SAY-ON-PAY&rdquo;)</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">In recent years,
good corporate governance commentators and advisors have advocated and, increasingly, governmental regulatory authorities, including
the SEC, are mandating that public companies initiate procedures to ensure that our shareholders have input on our compensation
programs for our named executive officers. This is commonly known as &ldquo;Say-on-Pay&rdquo;.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Our Board values
and encourages constructive dialogue on executive compensation and other important governance topics with our shareholders, to
whom it is ultimately accountable. We urge you to read this proxy statement for additional details on the Company&rsquo;s executive
compensation.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Our Say-on-Pay
Proposal is designed to provide our shareholders with the opportunity to consider and vote upon the compensation paid to our named
executive officers, as disclosed in this proxy statement pursuant to Item 402 of Regulation S-K, including the compensation table
and narrative discussion. Although the vote is advisory and non-binding on the Company or the Board, our Board and the Compensation
Committee will review the voting results. To the extent there is any significant lack of support for the compensation of our named
executive officers, we would expect to initiate procedures designed to help us better understand shareholder concerns. We ask our
shareholders to approve a Say-on-Pay proposal each year.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in; background-color: white">Marking the proxy
card &ldquo;For&rdquo; indicates support for the compensation of our named executive officers; marking the proxy card &ldquo;Against&rdquo;
indicates lack of support for the compensation of our named executive officers. You may abstain by marking the &ldquo;Abstain&rdquo;
box on the proxy card.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; background-color: white"><B>Vote Required
and Recommendation</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; background-color: white">This is an advisory
vote and does not require a minimum number of votes.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; background-color: white"><B>The Board unanimously
recommends you vote &quot;FOR&quot; the approval of the compensation</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; background-color: white"><B>paid to our
named executive officers</B>.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="a_011"></A>PROPOSAL 6 &ndash; <FONT STYLE="text-transform: uppercase">approve
one or more adjournments of the Annual Meeting to a later date or dates to solicit additional proxies if there are insufficient
votes to approve proposal 3 AND/oR PROPOSAL 4 or in the absence of a quorum</FONT></B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">We are asking our shareholders to approve
a proposal that will allow us to adjourn the Annual Meeting to a later date or dates to solicit additional proxies if there are
insufficient votes to approve Proposal 3 and/or Proposal 4 or if we do not have a quorum at the Annual Meeting. If our shareholders
approve this proposal, we could adjourn the Annual Meeting and any reconvened session of the Annual Meeting and use the additional
time to solicit additional proxies, including the solicitation of proxies from shareholders that have previously returned properly
executed proxies voting against approval of Proposal 3, Proposal 4 or both Proposal 3 and Proposal 4. Among other things, approval
of this proposal could mean that, even if we had received proxies representing a sufficient number of votes against approval of
Proposal 3 or Proposal 4, such that Proposal 3 or Proposal 4 would be defeated, we could adjourn the Annual Meeting without a vote
on the approval of Proposal 3 or Proposal 4 and seek to convince the holders of those shares to change their votes to votes in
favor of approval of Proposal 3 or Proposal 4. Additionally, we may seek to adjourn the Annual Meeting if a quorum is not present
at the Annual Meeting.</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Our Board believes that it is in the best
interests of our Company and our shareholders to be able to adjourn the Annual Meeting to a later date or dates if necessary or
appropriate for the above referenced reasons.</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Proposal 6 will be approved if a quorum
is present and the affirmative vote of the holders of shares of common stock present in person or represented by proxy and entitled
to vote at the Annual Meeting exceeds the votes cast against Proposal 6. If a quorum is not present at the Annual Meeting, Section
2, Subsection 2.8 of our bylaws states that a majority of the votes represented may adjourn the Annual Meeting.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>The Board unanimously recommends you
vote FOR the proposal allowing the Board to adjourn the Annual Meeting to a later date or dates if necessary or appropriate to
solicit additional proxies if there are insufficient votes to approve Proposal 3 and/or Proposal 4 or in the absence of a quorum.</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="text-transform: uppercase"><B><A NAME="a_012"></A>Security
Ownership Of Certain Beneficial Owners And Management</B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following
table shows information known to us about beneficial ownership of our common stock by:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-align: justify; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif">each of our directors;</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-align: justify; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif">each of our current NEOs as well as any
additional individuals identified as NEOs in the section of this report titled &ldquo;Executive Compensation&rdquo;;</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-align: justify; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif">all of our directors and executive officers
as a group; and</FONT></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-align: justify; text-indent: -0.25in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.75in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif">each person known by us to beneficially
own 5% or more of our common stock.</FONT></TD></TR></TABLE>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Beneficial ownership and percentage ownership
are determined in accordance with the rules of the SEC. Under these rules, beneficial ownership generally includes any shares as
to which the individual or entity has sole or shared voting power or investment power and includes any shares that an individual
or entity has the right to acquire ownership of on or before May 7, 2019, which is 60 days from the Record Date, through the exercise
of any option, warrant, conversion privilege or similar right. In computing the number of shares beneficially owned by a person
and the percentage ownership of that person, shares of our common stock that could be issued upon the exercise of outstanding options
and warrants that are exercisable on or before May 7, 2019 are considered to be outstanding. These shares, however, are not considered
outstanding as of the Record Date when computing the percentage ownership of each other person.</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">To our knowledge, except as indicated in
the footnotes to the following table and subject to state community property laws where applicable, all beneficial owners named
in this table have sole voting and investment power with respect to all shares shown as beneficially owned by them. Percentage
of ownership is based on ClearSign&rsquo;s shares of common stock outstanding as of the Record Date.</P>

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


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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Name and Address of Beneficial Owner (1)</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Amount of<BR> Beneficial<BR> Ownership (2)</TD><TD NOWRAP STYLE="padding-bottom: 1pt; font-weight: bold">&nbsp;</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Percent <BR>
of Class</TD><TD STYLE="padding-bottom: 1pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font-weight: bold; font-style: italic; text-align: left">Directors and Officers:</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD NOWRAP STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="width: 74%; text-align: left">Donald W. Kendrick, Ph. D.</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; text-align: right">211,917</TD><TD NOWRAP STYLE="width: 1%; text-align: left">(3)</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; text-align: right">0.8</TD><TD STYLE="width: 1%; text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Robert T. Hoffman</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">5,337,215</TD><TD NOWRAP STYLE="text-align: left">(4)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">20.0</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Lon E. Bell, Ph.D.</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">381,499</TD><TD NOWRAP STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1.4</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Bruce A. Pate</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">70,000</TD><TD NOWRAP STYLE="text-align: left">(5)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">0.3</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">James C. Simmons</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1,666,627</TD><TD NOWRAP STYLE="text-align: left">(6)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">6.2</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Susanne Meline</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">76,522</TD><TD NOWRAP STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">0.3</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">All Directors and Executive Officers as a Group (8 persons)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">7,883,515</TD><TD NOWRAP STYLE="text-align: left">(7)</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">29.2</TD><TD STYLE="text-align: left">%</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD NOWRAP STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>5% Owners</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD NOWRAP STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD NOWRAP STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">CLIR SPV LLC</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">5,213,543</TD><TD NOWRAP STYLE="text-align: left">&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">19.5</TD><TD STYLE="text-align: left">%</TD></TR>
</TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 0.5in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">(1)</FONT></TD><TD STYLE="text-align: justify">The address of each officer and director is 12870 Interurban
Avenue South, Seattle, Washington 98168.</TD>
</TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 0.5in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">(2)</FONT></TD><TD STYLE="text-align: justify">Beneficial ownership is determined in accordance with
Rule 13d-3 under the Securities Exchange Act of 1934, as amended, and is generally assigned to the person holding voting power
and/or investment power with respect to securities. With the exception of the securities beneficially owned by our officers and
directors and their affiliates, the ownership of the shares of common stock listed above were determined using public records.</TD>
</TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 0.5in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">(3)</FONT></TD><TD STYLE="text-align: justify">Includes options to purchase 157,084 shares of common
stock which may be exercised on or before May 07, 2019 . Excludes options to purchase 107,916 shares of common stock none of which
will vest on or before May 07, 2019.</TD>
</TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 0.5in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">(4)</FONT></TD><TD STYLE="text-align: justify">Mr. Hoffman is the managing member of GPCLIRSPV LLC which
is the managing member of CLIRSPV LLC, the owner of 5,213,543 shares of common stock. Mr. Hoffman disclaims beneficial ownership
of these shares except to the extent of his pecuniary interest in CLIRSPV LLC.</TD>
</TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 0.5in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">(5)</FONT></TD><TD STYLE="text-align: justify">The shares of common stock are owned by Pate Capital
Partners LP, a private investment partnership</TD>
</TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 0.5in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">(6)</FONT></TD><TD STYLE="text-align: justify">Mr Simmons is a principal of ICM Asset Management, Inc.,
an investment advisory firm (&quot;ICM&quot;). The issuer's common stock is held by ICM for its clients. While Mr. Simmons has
voting and investment control over the common stock held by ICM, he disclaims beneficial ownership of such common stock.</TD>
</TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 0.5in; text-align: left"><FONT STYLE="font-family: Times New Roman, Times, Serif">(7)</FONT></TD><TD STYLE="text-align: justify">Includes 1,000 shares and 97,021 options beneficially
held by the Company's interim Chief Financial Officer and 3,380 shares and 38,334 options beneficially held by the Companys Sr.
Vice President of Business Development. Neither of whom are listed as an NEO.</TD>
</TR></TABLE>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="text-transform: uppercase"><B><A NAME="a_013"></A>Certain
Relationships And Related Transactions</B></FONT></P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="background-color: white">In
February 2018, the Company completed a secondary offering. The following directors and officers participated</FONT> in the offering
on the same terms as the other investors and purchased shares of our common stock at a price of $2.25 per share.</P>

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


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

<TABLE CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER" STYLE="border-collapse: collapse; width: 80%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD NOWRAP STYLE="font-weight: bold; text-align: center; border-bottom: Black 1pt solid">Directors and Officers</TD><TD STYLE="font-weight: bold; padding-bottom: 1pt">&nbsp;</TD>
    <TD NOWRAP COLSPAN="2" STYLE="font-weight: bold; border-bottom: Black 1pt solid; text-align: center; vertical-align: bottom">Shares Purchased</TD><TD STYLE="padding-bottom: 1pt; font-weight: bold">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="width: 87%; text-align: left">Stephen E. Pirnat</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 10%; text-align: right">10,000</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Brian G. Fike</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">1,000</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left">Lon E. Bell, Ph.D.</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">111,000</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left; padding-bottom: 1pt">Susanne Meline</TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; text-align: right">22,222</TD><TD STYLE="padding-bottom: 1pt; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="text-align: left; padding-bottom: 2.5pt">All directos and Executive Officers as a Group (4 persons)</TD><TD STYLE="padding-bottom: 2.5pt">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; text-align: right">144,222</TD><TD STYLE="padding-bottom: 2.5pt; text-align: left">&nbsp;</TD></TR>
</TABLE>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><I>Investment by clirSPV LLP and Appointment
of Robert T. Hoffman Sr. to the Board of Directors</I></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In July 2018, clirSPV LLC purchased 5,213,543
shares of our common stock at a price of $2.25 per share. Robert T. Hoffman Sr., one of our directors, is the managing member of
GPCLIRSPV LLC, which is the managing member of clirSPV LLC. Mr. Hoffman has voting and investment control over the shares of common
stock owned by clirSPV LLC. In conjunction with the investment made by clirSPV LLC, we entered into a Voting Agreement with clirSPV
LLC pursuant to which Mr. Hoffman was named as a director.</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 Stock Purchase Agreement permitted clirSPV
LLC to purchase from the Company up to an aggregate 478,854 shares of common stock at a price of $4 per share. This right expired
on February 1, 2019. The Stock Purchase Agreement also permits clirSPV LLC to participate in future capital raising transactions
on the same terms as other investors participating in such transactions. This right will expire on December 31, 2023.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><I>Agreements with Stephen E. Pirnat</I></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">On December 31, 2018, we executed a Consulting
Agreement and a Confidential Separation Agreement and General Release (&ldquo;Release Agreement&rdquo;) with Stephen Pirnat, our
former Chief Executive Officer and director.</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 Consulting Agreement has a term of two
years, beginning on January 1, 2019 and ending on December 31, 2020. Pursuant to the Consulting Agreement, Mr. Pirnat agrees to
provide services concerning the business and operations of the Company including, but not limited to, assistance with the transition
of responsibilities to our new Chief Executive Officer and any other service previously performed by Mr. Pirnat during his tenure
as the Company&rsquo;s Chief Executive Officer, including any service that may relate to our reporting requirements under the Securities
Exchange Act of 1934, as amended. We have agreed to pay Mr. Pirnat $1.00 for each day he provides services under the Consulting
Agreement and to reimburse him for expenses incurred in providing the services.</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 exchange for a full release of any and
all claims relating to his employment that Mr. Pirnat may have had against us, we agreed to waive our right to repurchase 16,875
shares of common stock subject to an option that we issued to Mr. Pirnat on April 23, 2016 and we agreed to extend the term of
all of the options held by Mr. Pirnat to December 31, 2020.</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">On January 4, 2019, we executed a Consulting
Agreement and a Confidential Separation Agreement and General Release (&ldquo;Release Agreement&rdquo;) with Roberto Ruiz, our
former Chief Operating 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">The Consulting Agreement has a term of two
years, beginning on January 5, 2019 and ending on December 31, 2020. Pursuant to the Consulting Agreement, during the period from
January 5, 2019 through March 31, 2019 (the Initial Consulting Period&rdquo;), Mr. Ruiz must provide us with services, as we request
them. Beginning on April 1, 2019 and through the end of the term, any services to be provided will be agreed upon by us and Mr.
Ruiz. During the Initial Consulting Period, Mr. Ruiz will be paid a fee of $70,454.55 for services provided to us for no more than
45 days. If, during the Initial Consulting Period, we request additional services in excess of 45 days, we will pay Mr. Ruiz a
daily rate of $2,000. We will also reimburse Mr. Ruiz&rsquo;s expenses at cost.</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 Release Agreement, in exchange
for a full release of any and all claims relating to his employment that Mr. Ruiz may have had against us, we agreed to pay the
cost of his health insurance premiums during the Initial Consulting Period.</P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><I>Employment Agreement with Colin James
Deller</I></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">On January 28, 2019 (the &ldquo;Effective
Date&rdquo;), the Company and Colin James Deller entered into an employment agreement pursuant to which the Company employed Dr.
Deller as its President until April 1, 2019, at which time Dr. Deller will become the Company&rsquo;s Chief Executive Officer.
Pursuant to the agreement, the Company pays Dr. Deller an annual salary of $350,000. As an inducement to accept employment with
the Company, Dr. Deller was also granted an option to purchase 400,000 shares of the Company&rsquo;s common stock at an exercise
price of $1.16 per share and an option to purchase 200,000 shares of the Company&rsquo;s common stock at an exercise price of $2.25
per share. Each option has a term of 10 years and will vest as follows: the right to purchase one-third of the shares of common
stock subject to the option vested on the Effective Date; the right to purchase one-third of the shares will vest on the first
anniversary of the grant date; and the right to purchase one-third of the shares will vest on the second anniversary of the grant
date. The Company has agreed to pay certain expenses, not to exceed the sum of $100,000, related to Dr. Deller&rsquo;s move from
Tulsa, Oklahoma to Seattle, Washington, including reasonable expenses related to the sale of his home in Tulsa. As a temporary
adjustment for the difference in the cost of living between Tulsa and Seattle (the &ldquo;Relocation Adjustment&rdquo;), for a
period of four years (the &ldquo;Payment Period&rdquo;) from the Effective Date, the Company has also agreed to pay up to $6,000
a month to Dr. Deller for expenses related to temporary housing and travel to and from Tulsa to Seattle. If Dr. Deller purchases
a home in the Seattle area, the Relocation Adjustment will continue to be paid through the expiration of the Payment Period, although
the Relocation Adjustment may be adjusted or terminated upon mutual agreement of Dr. Deller and the Company. The agreement may
be terminated by the Company for cause, as defined in the agreement, due to Dr. Deller&rsquo;s death or disability, upon 30 days&rsquo;
notice to Dr. Deller or as a result of a change in control, as defined in the agreement. With the exception of a termination for
cause, if Dr. Deller&rsquo;s employment is terminated by the Company, aside from accrued but unpaid salary, bonus (if any) and
business expenses, Dr. Deller will receive the balance of the unpaid Relocation Adjustment and 6 months of his annual salary.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Other than as disclosed above and in the
sections of this proxy statement that discuss executive compensation and compensation paid to our non-executive directors, during
our last two fiscal years through the date of this proxy statement, there has not been any transaction or series of similar transactions
to which we were or will be a party in which the amount involved exceeded or will exceed the lesser of $120,000 or one percent
of the average of our total assets at year-end for the last two completed fiscal years and in which any of our directors, nominees
for director, executive officers, holders of more than five percent of any class of our voting securities or any member of the
immediate family of the foregoing persons had or will have a direct or indirect material interest.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; text-align: center; margin-bottom: 0pt"><FONT STYLE="text-transform: uppercase"><B><A NAME="a_014"></A>Requirements
For Advance Notification of Nominations<BR>
and Shareholder Proposals</B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Shareholder proposals submitted to us pursuant
to Rule 14a-8 promulgated under the Exchange Act for inclusion in our proxy statement and form of proxy for our 2020 Annual Meeting
of shareholders must be received by us no later than , 2019,which is 120 calendar days before the one-year anniversary of the date
on which the Company first mailed this proxy statement, and must comply with the requirements of the proxy rules promulgated by
the SEC. Shareholder proposals should be addressed to our Corporate Secretary at 12870 Interurban Avenue South, Seattle, Washington
98168.</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">Recommendations from shareholders that are
received after the deadline likely will not be considered timely for consideration by the Board for next year&rsquo;s Annual Meeting.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><FONT STYLE="text-transform: uppercase"><B><A NAME="a_015"></A>Other
Matters</B></FONT></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The Board does not intend to bring any other
matters before the Annual Meeting and has no reason to believe any other matters will be presented. <B><I>If other matters properly
come before the Annual Meeting, however, it is the intention of the persons named as proxy agents in the enclosed proxy card to
vote on such matters as recommended by the Board, or if no recommendation is given, in their own discretion.</I></B></P>

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


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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The Company&rsquo;s Annual Report on Form
10-K for the year ended December 31, 2018 is being mailed with this proxy statement to shareholders entitled to notice of the Annual
Meeting. The Annual Report includes the financial statements and management&rsquo;s discussion and analysis of financial condition
and results of operations. Copies of exhibits to the Annual Report may be obtained from us upon the payment of the reasonable expenses
we incur in copying and mailing any requested exhibit. The costs of preparing, assembling, mailing and soliciting the proxies will
be borne by us. Proxies may be solicited, without extra compensation, by our officers and employees by mail, telephone, facsimile,
personal interviews and other methods of communication.</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">If you and other residents at your mailing
address own shares in street name, your broker or bank may have sent you a notice that your household will receive only one copy
of proxy materials for each company in which you hold shares through that broker or bank. This practice of sending only one copy
of proxy materials is known as householding. If you did not respond that you did not want to participate in householding, you were
deemed to have consented to the process. If the foregoing procedures apply to you, your broker has sent one copy of our proxy statement
to your address. If you want to receive separate copies of the proxy materials in the future, or you are receiving multiple copies
and would like to receive only one copy per household, you should contact your stockbroker, bank or other nominee record holder,
or you may contact us at the address or telephone number below. In any event, if you did not receive an individual copy of this
proxy statement, we will send a copy to you if you address your written request to, or call, Brian G. Fike, interim Chief Financial
Officer, 12870 Interurban Avenue South, Seattle, Washington 98168, telephone number (206) 673-4848.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Copies of the documents referred to in this
proxy statement that appear on our website are also available upon request by any shareholder addressed to our Corporate Secretary,
ClearSign Combustion Corporation, 12870 Interurban Avenue South, Seattle, Washington 98168.</P>

<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">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="a_016"></A>ANNEX I</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>AMENDMENT NO. 1</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>TO THE</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>2011 EQUITY INCENTIVE PLAN</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>WHEREAS,</B> on January 27, 2011, the
Board of Directors (the &ldquo;Board&rdquo;) of ClearSign Combustion Corporation (the &ldquo;Company&rdquo;) approved and adopted
the ClearSign Combustion Corporation 2011 Equity Incentive Plan (the &ldquo;Plan&rdquo;); 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"><B>WHEREAS,</B> on March 11, 2019, in accordance
with Section 21 of the Plan, the Board resolved to amend the Plan for the purpose of increasing the number of shares of common
stock reserved for the Plan pursuant to Sections 3.1 and 3.2 of the Plan, subject to and effective upon approval by the holders
of the Company&rsquo;s common stock;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B>THEREFORE,</B> subject to, and effective
upon approval by the holders of the Company&rsquo;s issued and outstanding common stock, Sections 3.1 and 3.2 of the Plan shall
be amended as follows:</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in; background-color: white">3.1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Number
of Shares Available</U>. Subject to Sections 3.2, 3.3 and 18, the total aggregate number of Shares reserved and available for grant
and issuance pursuant to this Plan, shall be 4,003,839 Shares and will include Shares that are subject to: (a) issuance upon exercise
of an Option but cease to be subject to such Option for any reason other than exercise of such Option; (b) an Award granted hereunder
but forfeited or repurchased by the Company at the original issue price; and (c) an Award that otherwise terminates without Shares
being issued. At all times the Company shall reserve and keep available a sufficient number of Shares as shall be required to satisfy
the requirements of all outstanding Options granted under this Plan and all other outstanding but unvested Awards granted under
this Plan.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in; background-color: white">3.2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>Increase
in Number of Shares Available</U>. The maximum aggregate number of Shares that may be granted under the Plan will be increased
effective the first day of each of the Company&rsquo;s fiscal quarters, beginning with the fiscal quarter commencing April 1, 2019,
(the &ldquo;Adjustment Date&rdquo;) by an amount equal to the lesser of:</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in; background-color: white">(iii)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;15%
of the difference between the number of shares of Common Stock outstanding on the applicable Adjustment Date and the number of
shares of Common Stock outstanding at the beginning of the fiscal quarter immediately preceding the Adjustment Date; or</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in; background-color: white">(iv)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;such
lesser number of Shares as may be determined by the Board.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">In all other respects, the terms and conditions
of the Plan shall remain the same.</P>

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


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    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

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

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><A NAME="a_017"></A>ANNEX II</P>

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

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">ARTICLES OF AMENDMENT<BR>
TO<BR>
ARTICLES OF INCORPORATION<BR>
OF<BR>
CLEARSIGN COMBUSTION CORPORATION</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Pursuant to the provisions of Section 23B.10
of the Revised Code of Washington, the undersigned corporation adopts the following Articles of Amendment to its Articles of Incorporation:</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">1.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A
new paragraph is added to the end of Article 8 of the Articles of Incorporation to read as follows:</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 1in; text-indent: 0.5in">A special meeting of the shareholders
shall be held if the holders of at least 20% of all the votes entitled to be cast on any issue proposed to be considered at the
special meeting have delivered to the corporation one or more demands for the meeting in the manner and at the times set forth
in the Bylaws.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">2.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
foregoing amendment was duly approved by the shareholders of the Corporation on ____________ ___, 2019, in accordance with the
provisions of RCW&nbsp;23B.10.030.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-variant: small-caps">Executed
</FONT>as of this _____ day of ____________, 2019.</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>&nbsp;</TD>
    <TD COLSPAN="4"><FONT STYLE="font-size: 10pt; text-transform: uppercase">CLEARSIGN COMBUSTION CORPORATION,</FONT><BR>
<FONT STYLE="font-size: 10pt">a Washington corporation</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="4">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">By</FONT></TD>
    <TD COLSPAN="3" STYLE="border-bottom: Black 1pt solid">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: right; width: 50%">&nbsp;</TD>
    <TD STYLE="text-align: right; width: 5%">&nbsp;</TD>
    <TD STYLE="width: 6%"><FONT STYLE="font-size: 10pt">Name:</FONT></TD>
    <TD STYLE="width: 25%; border-bottom: Black 1pt solid"><FONT STYLE="font-size: 10pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></TD>
    <TD STYLE="width: 14%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD STYLE="text-align: right">&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">Its: </FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid">&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-transform: uppercase; text-align: center">&nbsp;</P>


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





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