<SEC-DOCUMENT>0001104659-21-059140-index.html : 20210430
<SEC-HEADER>0001104659-21-059140.hdr.sgml : 20210430
<ACCEPTANCE-DATETIME>20210430165528
ACCESSION NUMBER:		0001104659-21-059140
CONFORMED SUBMISSION TYPE:	10-K/A
PUBLIC DOCUMENT COUNT:		4
CONFORMED PERIOD OF REPORT:	20201231
FILED AS OF DATE:		20210430
DATE AS OF CHANGE:		20210430

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:		10-K/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35521
		FILM NUMBER:		21879188

	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>10-K/A
<SEQUENCE>1
<FILENAME>tm2114702d1_10ka.htm
<DESCRIPTION>FORM 10-K/A
<TEXT>
Document 1 - file: tm2114702d1_10ka.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.1
<SEQUENCE>2
<FILENAME>tm2114702d1_ex31-1.htm
<DESCRIPTION>EXHIBIT 31.1
<TEXT>
Document 2 - file: tm2114702d1_ex31-1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.2
<SEQUENCE>3
<FILENAME>tm2114702d1_ex31-2.htm
<DESCRIPTION>EXHIBIT 31.2
<TEXT>
Document 3 - file: tm2114702d1_ex31-2.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>tm2114702d1_10ka-img01.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: tm2114702d1_10ka-img01.jpg

</DOCUMENT>
</SEC-DOCUMENT>