Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
September 11, 2007
Patent Application Number
10505042
Date Filed
February 1, 2003
Patent Primary Examiner
Patent abstract
A piston ring for an internal combustion engine is made of steel and has an outer contact surface that is nitrated and coated to no more than 70 μm with a protective coating comprising nitrides of aluminum and/or silicium and/or zirconium in a matrix of chromium-nitride based material.
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