ClearSign Technologies Corporation Provides Full Year 2021 Update

Tulsa, OK, April 6, 2022 -- ClearSign Technologies Corporation (Nasdaq: CLIR) ("ClearSign" or the "Company"), an emerging leader in industrial combustion and sensing technologies that improve energy, operational efficiency and safety while dramatically reducing emissions, today provides an update on operations for the fourth quarter and full year ended December 31, 2021.   “This past