Project Comprised of 36 ClearSign Coreâ"¢ Process Burners in One Heater TULSA, OKLAHOMA / ACCESS Newswire / September 17, 2025 / ClearSign Technologies Corporation (Nasdaq:CLIR) ("ClearSign" or the "Company"), a leader in advanced combustion and sensing technologies that help industrial operators dramatically reduce emissions, increase efficiency and safety, and support the use of cleaner fuels including hydrogen, today announces that it has received the initial engineering order from an integrated petroleu ...