Piston ring
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Aug 16, 2011
Grant Date -
Sep 25, 2008
app pub date -
Mar 24, 2008
filing date -
Mar 23, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A piston has a body with a first circumferentially disposed groove. A first ring is movably disposed within the first groove. The first ring defines an inner circumferential groove. A blocking ring is at least partially located in the groove of the first ring and the groove of the piston. One or more vent passages may connect a first volume in the piston to a second volume outside the piston.
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