ClearSign Technologies Corporation Announces First Quarter 2021 Conference Call and Virtual Annual Meeting

Hosting Call at 5pm ET (2pm PT) on Tuesday, June 15, 2021 Virtual Annual Meeting at 5pm ET (2pm PT) on Thursday, June 17, 2021    SEATTLE, May 13, 2021 –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