ClearSign designs, develops and markets technologies that aim to improve the key performance characteristics of combustion systems, including emission, operational performance, energy efficiency and overall cost effectiveness.
|EFFECT||Notice from the SEC of registration effectiveness||Sep 21, 2018|
|SC 13D||Filing by person(s) reporting owned shares of common stock in a public company >5%||Jul 30, 2018|
|D||Official notice of an offering of securities that is made without registration under the Securities Act in reliance on an exemption provided by Regulation D and Section 4(6) under the Act||Jul 23, 2018|
|SC 13D/A||Amendment to a SC 13D filing||Mar 7, 2018|