ClearSign Technologies Corporation designs and develops products and technologies for decarbonization and improving key performance characteristics of industrial and commercial systems in the United States and the People's Republic of China. Its technologies include ClearSign core burner technology, which consists of an industrial burner body and a downstream porous ceramic or metal flame stabilizing structure; ClearSign core process burner technology, a direct burner replacement for traditional refinery process heaters; ClearSign core boiler burner technology; ClearSign core flaring burners, which provide a flare product with extremely low nitrogen oxide emissions; and ClearSign eye flame sensor, an electrical flame sensor for industrial applications. The company serves the energy, institutional, commercial and industrial boiler, chemical, and petrochemical industries. ClearSign Technologies Corporation was formerly known as ClearSign Combustion Corporation and changed its name to ClearSign Technologies Corporation in November 2019. It was incorporated in 2008 and is headquartered in Tulsa, Oklahoma.