Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
August 16, 2011
Patent Application Number
12054101
Date Filed
March 24, 2008
Patent Primary Examiner
Patent 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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