TULSA, Okla., June 20, 2024 /PRNewswire/ -- 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, announces that clirSPV LLC ("clirSPV") exercised its participation right (as modified from time to time, the "Participation Right") that was granted to clirSPV pursuant to the terms of that certain Stock Purchase Agreement, ...