Clearsign combustion expects it will be required to incur non-cash impairment charge of estimated $0.3 mln in results statement in quarter ended sept 30

Clearsign combustion-expects it will be required to incur non-cash impairment charge of estimated $0.3 million in results statement in quarter ended sept 30.clearsign combustion - on sept 25, co determined to write-off certain patents included in its patent portfolio.clearsign combustion - co does not expect future cash expenditures relating to write-off.
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