Previous ‘424B2’:  ‘424B2’ on 12/7/16   ·   Next & Latest:  ‘424B2’ on 8/21/20   ·   25 References:   To:  ClearSign Technologies Corp. – ‘10-Q’ on 8/14/20 for 6/30/20 To:  ClearSign Technologies Corp. – ‘8-K’ on 7/13/20 for 7/10/20 To:  ClearSign Technologies Corp. – ‘8-K’ on 7/1/20 for 6/30/20 To:  ClearSign Technologies Corp. – ‘8-K’ on 6/22/20 for 6/17/20 To:  ClearSign Technologies Corp. – ‘10-Q’ on 5/14/20 for 3/31/20 To:  ClearSign Technologies Corp. – ‘DEF 14A’ on 4/27/20 for 6/17/20 To:  ClearSign Technologies Corp. – ‘8-K’ on 4/17/20 for 4/15/20 To:  ClearSign Technologies Corp. – ‘10-K’ on 3/30/20 for 12/31/19 To:  ClearSign Technologies Corp. – ‘8-K’ on 2/20/20 for 2/13/20 To:  ClearSign Technologies Corp. – ‘8-K’ on 1/17/20 for 1/15/20 To:  ClearSign Technologies Corp. – ‘8-K’ on 1/15/20 for 1/9/20 To:  ClearSign Technologies Corp. – ‘8-K’ on 6/12/19 for 6/11/19 To:  ClearSign Technologies Corp. – ‘8-K/A’ on 6/5/19 for 5/8/19 To:  ClearSign Technologies Corp. – ‘10-Q’ on 5/14/19 for 3/31/19 To:  ClearSign Technologies Corp. – ‘8-K’ on 5/13/19 for 5/8/19 To:  ClearSign Technologies Corp. – ‘8-K’ on 4/18/19 for 4/17/19 To:  ClearSign Technologies Corp. – ‘DEF 14A’ on 4/4/19 for 5/8/19 To:  ClearSign Technologies Corp. – ‘8-K’ on 4/2/19 for 4/1/19 To:  ClearSign Technologies Corp. – ‘8-K’ on / for 3/19/19 To:  ClearSign Technologies Corp. – ‘10-K’ on 3/12/19 for 12/31/18 To:  ClearSign Technologies Corp. – ‘8-K’ on 2/12/19 for 2/6/19 To:  ClearSign Technologies Corp. – ‘8-K’ on 1/30/19 for 1/24/19 To:  ClearSign Technologies Corp. – ‘8-K’ on 1/10/19 for 1/8/19 To:  ClearSign Technologies Corp. – ‘8-K’ on 1/7/19 for 12/31/18 To:  ClearSign Technologies Corp. – ‘8-A12B’ on 4/23/12