Petrochemical Client Requesting Performance Mapping for Future Deployment TULSA, OK / ACCESS Newswire / September 23, 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 an order for a comprehensive range of process burner testing ...