<SEC-DOCUMENT>0001558370-25-008617-index.html : 20250613
<SEC-HEADER>0001558370-25-008617.hdr.sgml : 20250613
<ACCEPTANCE-DATETIME>20250613161009
ACCESSION NUMBER:		0001558370-25-008617
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		3
FILED AS OF DATE:		20250613
DATE AS OF CHANGE:		20250613

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ClearSign Technologies Corp
		CENTRAL INDEX KEY:			0001434524
		STANDARD INDUSTRIAL CLASSIFICATION:	INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL [3823]
		ORGANIZATION NAME:           	08 Industrial Applications and Services
		EIN:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		DEFA14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35521
		FILM NUMBER:		251046621

	BUSINESS ADDRESS:	
		STREET 1:		8023 E. 63RD PLACE, SUITE 101
		CITY:			TULSA
		STATE:			OK
		ZIP:			74133
		BUSINESS PHONE:		(918) 236-6461

	MAIL ADDRESS:	
		STREET 1:		8023 E. 63RD PLACE, SUITE 101
		CITY:			TULSA
		STATE:			OK
		ZIP:			74133

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CLEARSIGN COMBUSTION CORP
		DATE OF NAME CHANGE:	20080507
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEFA14A
<SEQUENCE>1
<FILENAME>clir-20250613xdefa14a.htm
<DESCRIPTION>DEFA14A
<TEXT>
Document 1 - file: clir-20250613xdefa14a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>clir-20250613xdefa14a_bg001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: clir-20250613xdefa14a_bg001.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>clir-20250613xdefa14a_bg002.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: clir-20250613xdefa14a_bg002.jpg

</DOCUMENT>
</SEC-DOCUMENT>