SEATTLE, June 15, 2021 -- 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, today provides an update on operations for the first quarter ended on March 31, 2021.   “During the first quarter of

SEATTLE, June 7, 2021 –ClearSign Technologies Corporation (Nasdaq: CLIR) (“ClearSign” or the “Company”), is set to join the Russell MicrocapÒ Index at the conclusion of the 2021 Russell indexes annual reconstitution, effective after the US market opens on June 28, according to a preliminary list of additions posted June 4.   Membership in the Russell