<SEC-DOCUMENT>0001104659-22-001687-index.html : 20220105 <SEC-HEADER>0001104659-22-001687.hdr.sgml : 20220105 <ACCEPTANCE-DATETIME>20220105214126 ACCESSION NUMBER: 0001104659-22-001687 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20220103 FILED AS OF DATE: 20220105 DATE AS OF CHANGE: 20220105 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: HOFFMAN Robert Thurston Sr CENTRAL INDEX KEY: 0001748409 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-35521 FILM NUMBER: 22513530 MAIL ADDRESS: STREET 1: 119 WARREN AVENUE CITY: SPRING LAKE STATE: NJ ZIP: 07762 ISSUER: 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 BUSINESS ADDRESS: STREET 1: 8023 E. 63RD PLACE, SUITE 101 CITY: TULSA STATE: OK ZIP: 74133 BUSINESS PHONE: (918) 236-7770 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>4 <SEQUENCE>1 <FILENAME>tm221817d3_4.xml <DESCRIPTION>OWNERSHIP DOCUMENT <TEXT> Document 1 - file: tm221817d3_4.html
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