Independent Source Testing Confirms Emissions Levels Below Guarantee TULSA, Okla., May 22, 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 the five burner heater has had a successful start-up and is now in operation. "We are proud to have completed the second of the two multi bu ...