<SEC-DOCUMENT>0001104659-21-106332.txt : 20210816
<SEC-HEADER>0001104659-21-106332.hdr.sgml : 20210816
<ACCEPTANCE-DATETIME>20210816161540
ACCESSION NUMBER:		0001104659-21-106332
CONFORMED SUBMISSION TYPE:	NT 10-Q
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20210630
FILED AS OF DATE:		20210816
DATE AS OF CHANGE:		20210816
EFFECTIVENESS DATE:		20210816

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ClearSign Technologies 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:		NT 10-Q
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35521
		FILM NUMBER:		211178379

	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

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CLEARSIGN COMBUSTION CORP
		DATE OF NAME CHANGE:	20080507
</SEC-HEADER>
<DOCUMENT>
<TYPE>NT 10-Q
<SEQUENCE>1
<FILENAME>tm2118640d2_nt10q.htm
<DESCRIPTION>NT 10-Q
<TEXT>
<HTML>
<HEAD>
<TITLE></TITLE>
</HEAD>
<BODY STYLE="font-family: Times New Roman, Times, Serif">


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-right-width: 0in; border-right-color: Black; border-left-width: 0in; border-left-color: Black"><B>UNITED
STATES</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; border-right-width: 0in; border-right-color: Black; border-left-width: 0in; border-left-color: Black"><B>WASHINGTON, DC 20549</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>FORM </B><B>12b-25</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>NOTIFICATION OF LATE FILING</B></P>


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

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

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt">001-35521</P>

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

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


<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt">185064102</P>

<!-- Field: Rule-Page --><DIV STYLE="margin: 3pt auto; width: 25%"><DIV STYLE="font-size: 1pt; border-top: Black 1pt solid">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

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

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


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><I>(Check One):</I>&nbsp;&nbsp;&nbsp;&nbsp;<FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;Form 10-K&nbsp;&nbsp;&nbsp;&nbsp;<FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;Form 20-F&nbsp;&nbsp;&nbsp;&nbsp;<FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;Form 11-K&nbsp;&nbsp;&nbsp;&nbsp;<FONT STYLE="font-family: Wingdings">&#120;</FONT>&nbsp;Form
10-Q&nbsp;&nbsp;&nbsp;&nbsp;<FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;Form 10-D&nbsp;&nbsp;&nbsp;&nbsp;<FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;Form N-SAR&nbsp;&nbsp;&nbsp;&nbsp;<FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;Form N-CSR
</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">For Period Ended:
<B>June 30</B><B>, 2021</B></P>


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


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; margin-left: 0.5in; text-indent: 0in; text-align: justify"><FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;&nbsp;Transit
ion Report on Form 10-K</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; margin-left: 0.5in; text-indent: 0in; text-align: justify"><FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;&nbsp;Transit
ion Report on Form 20-F</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; margin-left: 0.5in; text-indent: 0in; text-align: justify"><FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;&nbsp;Transit
ion Report on Form 11-K</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; margin-left: 0.5in; text-indent: 0in; text-align: justify"><FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;&nbsp;Transition
Report on Form 10-Q</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; margin-left: 0.5in; text-indent: 0in; text-align: justify"><FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;&nbsp;Transition
Report on Form N-SAR</P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; border-left-width: 0in; border-left-color: Black">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; margin-left: 0.5in; text-indent: 0in; text-align: justify">For
the Transition Period Ended: ____________</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>
    <TD STYLE="vertical-align: bottom; border: black 1pt solid; padding: 2pt 1.5pt; font-size: 10pt; text-align: center"><B>Nothing in this form shall be construed </B><B>to </B><B>imply </B><B>that </B><B>the Commission has verified any information contained </B><B>herein.</B></TD>
    <TD STYLE="font-size: 10pt">&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; border-left-width: 0in; border-left-color: Black">If
the notification relates to a portion of the filing checked above, identify
the item(s) to which the notification relates: <U>Not Applicable</U></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; border-left-width: 0in; border-left-color: Black"><B>PART </B>I &#8212;
<B>REGISTRANT INFORMATION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; border-left-width: 0in; border-left-color: Black"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; border-left-width: 0in; border-left-color: Black"><B></B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top; text-align: left">
  <TD STYLE="border-bottom: Black 1pt solid; width: 50%">ClearSign Technologies Corporation</TD>
  <TD STYLE="padding-bottom: 1pt; width: 50%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
  <TD>Full name of Registrant</TD>
  <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
  <TD>&nbsp;</TD>
  <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
  <TD STYLE="border-bottom: Black 1pt solid">Not Applicable</TD>
  <TD STYLE="padding-bottom: 1pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
  <TD>Former name if Applicable</TD>
  <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
  <TD>&nbsp;</TD>
  <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
  <TD STYLE="border-bottom: Black 1pt solid">12870 Interurban Avenue South</TD>
  <TD STYLE="padding-bottom: 1pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
  <TD>Address of Principal Executive Office (Street and number)</TD>
  <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
  <TD>&nbsp;</TD>
  <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
  <TD STYLE="border-bottom: Black 1pt solid">Seattle, Washington 98168</TD>
  <TD STYLE="padding-bottom: 1pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
  <TD>City, State and Zip Code</TD>
  <TD>&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; border-left-width: 0in; border-left-color: Black"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; border-left-width: 0in; border-left-color: Black"><B></B></P>

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<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="border-top: black 1pt solid; padding: 2pt 1.25pt 1.75pt; font-size: 10pt"></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>PART II </B>&#8212; <B>RULES 12b-25 (b) AND (c)</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 0pt 0.15pt; text-indent: -0.15pt; border-left-width: 0in; border-left-color: Black">If
the subject report could not be filed without unreasonable effort or expense and the registrant seeks
relief pursuant to Rule 12b-25(b), the following should be completed. (Check box if appropriate.)</P>

<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"></P>

<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: 0.25in"><FONT STYLE="font-family: Wingdings">&#120;</FONT></TD><TD STYLE="width: 0.25in; text-align: left">(a)</TD><TD STYLE="text-align: justify">The reasons described in reasonable detail in Part Ill of
this form could not be eliminated without unreasonable effort or expense;</TD>
</TR>
<TR STYLE="vertical-align: top; text-align: justify">
    <TD>&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: justify">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: justify">
    <TD>&nbsp;</TD><TD STYLE="text-align: left">(b)</TD><TD STYLE="text-align: justify">The subject annual report, semi-annual report, transition
report on Form 10-K, Form 20-F, Form 11-K, Form N-SAR or Form N-CSR, or portion thereof will be filed on or before the fifteenth calendar
day following the prescribed due date; or the subject quarterly report or transition report on Form 10-Q, or subject distribution report
on Form 10-D, or portion thereof, will be filed on or before the fifth calendar day following the prescribed due date; and</TD>
</TR>
<TR STYLE="vertical-align: top; text-align: justify">
    <TD>&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: justify">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: justify">
    <TD>&nbsp;</TD><TD STYLE="text-align: left">(c)</TD><TD STYLE="text-align: justify">The accountant's statement or other exhibit required by Rule
12b-25(c) has been attached if applicable.</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; border-left-width: 0in; border-left-color: Black"><B>PART
III </B>&#8212; <B>NARRATIVE</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 0pt 0.05pt; text-indent: -0.05pt">State
below in reasonable detail why Form 10-K, 20-F,
11-K, 10-Q, 10-D, N-SAR, N-CSR, or the transition report or portion thereof, could not be filed within
the prescribed time period.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.05pt; text-indent: -0.05pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.05pt; text-indent: -0.05pt;">ClearSign Technologies
Corporation (the &#8220;Company&#8221;) has determined that it is unable to file its Quarterly Report on Form 10-Q for the quarter ended
June 30, 2021 (the &#8220;Q2 2021 Form 10-Q&#8221;) by the prescribed due date without unreasonable effort or expense for the reasons
described below.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.05pt; text-indent: -0.05pt;">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.05pt; text-indent: -0.05pt;">As previously disclosed
on the Company&#8217;s Current Report on Form 8-K filed with the Securities and Exchange Commission on July 30, 2021, the Company&#8217;s
Chief Financial Officer, Treasurer, and Secretary, passed away, as a result of which the Company experienced an unanticipated delay in
preparation of its Q2 2021 Form 10-Q. The Company intends to file its Q2 2021 Form 10-Q within the five-day extension period afforded
by Rule 12b-25 under the Securities Exchange Act of 1934, as amended.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.05pt; text-indent: -0.05pt">&nbsp;</P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; border-left-width: 0in; border-left-color: Black"><B>PART
IV </B>&#8212; <B>OTHER </B><B>INFORMATION</B></P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0; width: 100%"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 0.25in; text-align: left">(1)</TD><TD STYLE="text-align: justify">Name and telephone number of person to contact in regard to
this notification.</TD>
</TR></TABLE>

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

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top; text-align: left">
  <TD STYLE="border-bottom: Black 1pt solid; text-align: center; width: 30%">Colin James Deller</TD>
  <TD STYLE="text-align: center; padding-bottom: 1pt; width: 3%">&nbsp;</TD>
  <TD STYLE="border-bottom: Black 1pt solid; text-align: center; width: 45%">206-673-4848</TD>
  <TD STYLE="text-align: center; padding-bottom: 1pt; width: 25%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
  <TD STYLE="text-align: center">(Name)</TD>
  <TD STYLE="text-align: center">&nbsp;</TD>
  <TD STYLE="text-align: center">(Area Code) (Telephone Number)</TD>
  <TD STYLE="text-align: center">&nbsp;</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: 0in"></TD><TD STYLE="width: 0.25in; text-align: left">(2)</TD><TD STYLE="text-align: justify">Have all other periodic reports required under Section 13 or
15(d) of the Securities Exchange Act of 1934 or Section 30 of the Investment Company Act of 1940 during the preceding 12 months or for
such shorter period that the registrant was required to file such report(s) been filed? If the answer is no, identify report(s).&nbsp;&nbsp;&nbsp;&nbsp;<FONT STYLE="font-family: Wingdings">&#120;</FONT>&nbsp;Yes&nbsp;&nbsp;&nbsp;&nbsp;<FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;No</TD>
</TR></TABLE>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 13.5pt; text-indent: -13.5pt">&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: 0in"></TD><TD STYLE="width: 0.25in; text-align: left">(3)</TD><TD STYLE="text-align: justify">Is it anticipated that any significant change in results of
operations from the corresponding period for the last fiscal year will be reflected by the earnings statements to be included in the
subject report or portion thereof?&nbsp;&nbsp;&nbsp;&nbsp;<FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;Yes&nbsp;&nbsp;&nbsp;&nbsp;<FONT STYLE="font-family: Wingdings">&#120;</FONT>&nbsp;No</TD>
</TR></TABLE>

<P STYLE="margin-top: 0; margin-bottom: 0; margin-left: 0in; text-indent: 0in; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 13.5pt; text-indent: -13.5pt"></P>






<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.2pt; text-indent: -0.2pt; border-left-width: 0in; border-left-color: Black"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.2pt; text-indent: -0.2pt; border-left-width: 0in; border-left-color: Black">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.2pt; text-indent: -0.2pt; border-left-width: 0in; border-left-color: Black">If
so, attach an explanation of the anticipated change, both narratively and quantitatively, and, if appropriate, state the reasons why a
reasonable estimate of the results cannot be made.</P>

<P STYLE="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 0pt 0.05pt; text-align: center; text-indent: -0.05pt; border-right-width: 0in; border-right-color: Black; border-left-width: 0in; border-left-color: Black">Forward-Looking
Statements</P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.05pt; text-indent: -0.05pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.05pt; text-indent: -0.05pt;">This filing may contain
forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements are
those that predict or describe future events or trends and that do not relate solely to historical matters. We use words such as &#8220;may,&#8221;
 &#8220;would,&#8221; &#8220;could,&#8221; &#8220;should,&#8221; &#8220;will,&#8221; &#8220;likely,&#8221; &#8220;expect,&#8221; &#8220;anticipate,&#8221;
 &#8220;believe,&#8221; &#8220;intend,&#8221; &#8220;plan,&#8221; &#8220;forecast,&#8221; &#8220;outlook,&#8221; &#8220;project,&#8221;
 &#8220;estimate&#8221; and similar expressions suggesting future outcomes or events to identify forward-looking statements or forward-looking
information. These statements including the statements regarding the Company&#8217;s intent to file certain periodic reports by certain
dates, are based on the Company&#8217;s current expectations and involve risks and uncertainties that could cause the Company&#8217;s
actual results to differ materially. Factors that may cause future results to differ materially from the Company&#8217;s current expectations
include the risk that the preparation of the Company&#8217;s restated financial statements or other subsequent events would require the
Company to make additional financial statement adjustments, the risk that estimates are incorrect, the methodology applied to calculate
the estimates of the adjustments, and inherent limitations in internal control over financial reporting. For further information on risks
and uncertainties that may affect the Company&#8217;s business, see the &#8220;Risk Factors&#8221; and &#8220;Management&#8217;s Discussion
and Analysis of Financial Condition and Results of Operations&#8221; sections of the Company&#8217;s Annual Report on Form 10-K for the
year ended December 31, 2020 and its Quarterly Report on Form 10-Q for the quarter ended March 31, 2021, as well as the Company&#8217;s
other reports filed from time to time with the SEC. The Company undertakes no obligation to update any forward-looking statements made
in this filing to reflect future events or developments, except as required by law. Because it is not possible to predict or identify
all such factors, this list cannot be considered a complete set of all potential risks or uncertainties.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.05pt; text-indent: -0.05pt">&nbsp;</P>

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

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

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<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">(Name of Registrant as Specified
in Charter)</P>


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caused this notification to be signed on its behalf by the undersigned hereunto duly authorized.</P>

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  <TD STYLE="padding-bottom: 1pt; width: 50%">Date: August 16, 2021</TD>
  <TD STYLE="padding-bottom: 1pt; width: 4%">By:</TD>
  <TD STYLE="border-bottom: Black 1pt solid; width: 36%"><I>/s/ Colin James Deller</I></TD>
  <TD STYLE="padding-bottom: 1pt; width: 10%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
  <TD>&nbsp;</TD>
  <TD>&nbsp;</TD>
  <TD>Name: Colin James Deller</TD>
  <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
  <TD>&nbsp;</TD>
  <TD>&nbsp;</TD>
  <TD>Title: Chief Executive Officer</TD>
  <TD>&nbsp;</TD></TR>
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