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The grant was made by the Compensation Committee at a meeting held on April 12, 2018"},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The right to purchase the option shares vests at the rate of 6.25% commencing on July 1, 2018 and continuing thereafter on the first day of each quarter until the right to purchase all of the option shares has vested."}],"balance_after":141500,"derivative":{"exercise_price":1.9,"expiration_date":"2028-04-01","underlying":"Common Stock","underlying_shares":20000},"source":{"system":"sec-edgar","filing":"0001144204-18-022715","document":"tv491183_4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1434524/000114420418022715/tv491183_4.xml","form_type":"4"}},{"id":4228506,"issuer":{"id":7487,"kind":"organization","name":"ClearSign Technologies Corp","symbol":"CLIR"},"owners":[{"id":167263,"kind":"person","name":"Ruiz Roberto","position":1,"cik":"0001563443","reported_name":"Ruiz Roberto","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock/CLIR","published_at":"2017-08-21T20:05:20.000Z","date":"2017-08-18","kind":"purchase","acquired":true,"shares":1000,"price":3.19,"value":3190.0,"ownership":{"direct":false,"nature":"By IRA"},"balance_after":5560,"source":{"system":"sec-edgar","filing":"0001144204-17-044389","document":"v473754_4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1434524/000114420417044389/v473754_4.xml","form_type":"4"}},{"id":4271676,"issuer":{"id":7487,"kind":"organization","name":"ClearSign Technologies Corp","symbol":"CLIR"},"owners":[{"id":167263,"kind":"person","name":"Ruiz Roberto","position":1,"cik":"0001563443","reported_name":"Ruiz Roberto","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Option to Purchase Common Stock","published_at":"2017-06-27T10:04:12.000Z","date":"2017-06-23","kind":"grant","acquired":true,"shares":10000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The right to purchase the option shares vests at the rate of 6.25% commencing on June 30, 2017 and continuing thereafter on the last day of each quarter until the right to purchase all of the option shares has vested."}],"balance_after":121500,"derivative":{"exercise_price":3.8,"expiration_date":"2027-04-01","underlying":"Common Stock","underlying_shares":10000},"source":{"system":"sec-edgar","filing":"0001144204-17-034214","document":"v469735_4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1434524/000114420417034214/v469735_4.xml","form_type":"4"}},{"id":4448762,"issuer":{"id":7487,"kind":"organization","name":"ClearSign Technologies Corp","symbol":"CLIR"},"owners":[{"id":167263,"kind":"person","name":"Ruiz Roberto","position":1,"cik":"0001563443","reported_name":"Ruiz Roberto","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock/CLIR","published_at":"2017-02-14T22:54:47.000Z","date":"2017-02-10","kind":"grant","acquired":true,"shares":20833,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On February 10, 2017, the reporting person was granted 20,833 shares of common stock, having a per share value of $3.60, the closing price of the Issuer's common stock on the date of grant, from the Company's 2011 Equity Incentive Plan as payment of a bonus approved by the Issuer's Compensation Committee.  The Company has the right to repurchase the shares at a price of $0.0001 per share upon the termination of the reporting person's employment or other circumstances designated in the award agreement.  The repurchase right expires on February 10, 2018."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On February 10, 2017, the reporting person was granted 20,833 shares of common stock, having a per share value of $3.60, the closing price of the Issuer's common stock on the date of grant, from the Company's 2011 Equity Incentive Plan as payment of a bonus approved by the Issuer's Compensation Committee.  The Company has the right to repurchase the shares at a price of $0.0001 per share upon the termination of the reporting person's employment or other circumstances designated in the award agreement.  The repurchase right expires on February 10, 2018."}],"balance_after":27313,"source":{"system":"sec-edgar","filing":"0001144204-17-009084","document":"v459439_4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1434524/000114420417009084/v459439_4.xml","form_type":"4"}},{"id":4480550,"issuer":{"id":7487,"kind":"organization","name":"ClearSign Technologies Corp","symbol":"CLIR"},"owners":[{"id":167263,"kind":"person","name":"Ruiz Roberto","position":1,"cik":"0001563443","reported_name":"Ruiz Roberto","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Warrant to Purchase Common Stock","published_at":"2017-01-26T21:33:51.000Z","date":"2017-01-25","kind":"other","acquired":true,"shares":760,"ownership":{"direct":false,"nature":"By IRA"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The common stock and the warrants reported on this Form 4 were acquired pursuant to the exercise of subscription rights previously distributed by the Issuer to all holders of the Issuer's common stock. Each holder received 0.2 subscription rights per share of stock owned, and each right allowed the recipient to purchase one unit, consisting of one share of common stock and one warrant to purchase one share of common stock. The subscription price per unit was $4.00."},{"field":"derivative.underlying","element":"underlyingSecurityTitle","label":"F2","text":"Each warrant entitles the holder to purchase one share of the Company's common stock at an exercise price of $4.00 from the date of issuance through January 25, 2019."}],"balance_after":760,"derivative":{"exercise_price":4,"exercise_date":"2017-01-25","expiration_date":"2019-01-25","underlying":"Common Stock","underlying_shares":760},"source":{"system":"sec-edgar","filing":"0001144204-17-004041","document":"v457574_4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1434524/000114420417004041/v457574_4.xml","form_type":"4"}},{"id":4480549,"issuer":{"id":7487,"kind":"organization","name":"ClearSign Technologies Corp","symbol":"CLIR"},"owners":[{"id":167263,"kind":"person","name":"Ruiz Roberto","position":1,"cik":"0001563443","reported_name":"Ruiz Roberto","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Warrant to Purchase Common Stock","published_at":"2017-01-26T21:33:51.000Z","date":"2017-01-25","kind":"other","acquired":true,"shares":1080,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The common stock and the warrants reported on this Form 4 were acquired pursuant to the exercise of subscription rights previously distributed by the Issuer to all holders of the Issuer's common stock. 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