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SEC Edgar

CLEARSIGN COMBUSTION CORP

SIC 3823 · Industrial Instruments For Measurement, Display, And Control
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$CLIR

CLEARSIGN COMBUSTION CORP

CIK:0001434524|SEC Filings

INDENTURES

EX-4.1
clir-20241231xex4d1.htm
2025-03-31T00:00:00Z
EX-4.1
clir-20231231xex4d1.htm
2024-04-01T00:00:00Z
EX-4.2
tmb-20220701xex4d2.htm
2022-07-01T00:00:00Z
EX-4.2
tv524217_ex4-2.htm
2019-06-27T00:00:00Z
EX-4.1
v457373_ex4-1.htm
2017-01-24T00:00:00Z
EX-4.1
v454544_ex4-1.htm
2016-12-07T00:00:00Z
EX-4.1
v400802_ex4-1.htm
2015-02-26T00:00:00Z
EX-4.1
v310537_ex4-1.htm
2012-04-25T00:00:00Z
EX-4.1
v308741_ex4-1.htm
2012-04-06T00:00:00Z
EX-4.2
v240232_ex4-2.htm
2011-11-14T00:00:00Z
EX-4.1
clir-20251231xex4d1.htm
2026-03-31T00:00:00Z
EX-4.1
tm2520917d1_ex4-1.htm
2025-07-17T00:00:00Z
EX-4.1
tm2412465d1_ex4-1.htm
2024-04-23T00:00:00Z
EX-4.3
tm2412212d1_ex4-3.htm
2024-04-19T00:00:00Z
EX-4.1
tm2412212d1_ex4-1.htm
2024-04-19T00:00:00Z
EX-4.4
tm2412212d1_ex4-4.htm
2024-04-19T00:00:00Z
EX-4.2
tm2412212d1_ex4-2.htm
2024-04-19T00:00:00Z
EX-4.1
tm2323370d1_ex4-1.htm
2023-08-11T00:00:00Z
EX-4.2
tm205247d1_ex4-2.htm
2020-03-30T00:00:00Z