Piston ring
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Oct 14, 2014
Grant Date -
Sep 13, 2012
app pub date -
Oct 14, 2010
filing date -
Nov 10, 2009
priority date (Note) -
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Abstract
A piston ring, in particular a compression piston ring, includes a running surface, upper and lower flank areas, an inner peripheral area and a joint. The wall thickness of the piston ring is uniform over its periphery and at least the running surface is provided with a PVD coating or a CVD layer in such a manner that the running surface layer has a lesser layer thickness in the peripheral area close to the joint than in the remaining peripheral area of the running surface.
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