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Class Information
Number: 277/463
Name: Seal for a joint or juncture > Seal between relatively movable parts (i.e., dynamic seal) > Piston ring or piston ring expander or seat therefor > Piston ring including exposed port, slot, pocket, groove, channel, recess, or bevel > Circumferential groove, channel, recess, or bevel > Ports
Description: Piston ring wherein the piston ring has through holes.

Patents under this class:

Patent Number Title Of Patent Date Issued
8555849 Pistons for internal combustion engines Oct. 15, 2013
6959930 Combination oil scrapper ring/gas seal assembly Nov. 1, 2005
5788246 Seal device for piston rod Aug. 4, 1998
5651553 Antirotation structure for combined oil ring Jul. 29, 1997
5411609 Section steel wire of oil ring May. 2, 1995
5064206 Piston ring Nov. 12, 1991
4796898 Oil scraper piston ring with elliptical oil vent holes Jan. 10, 1989
4629200 Non-metallic piston rings with controlled expansion pressure Dec. 16, 1986
4582328 Double acting stirling engine piston ring Apr. 15, 1986
4497497 Oil ring assembly with annular expander spring Feb. 5, 1985
4422649 Stirling engine piston ring Dec. 27, 1983
4331065 Engine piston assembly with improved oil control May. 25, 1982
4214762 Rolled metal piston ring Jul. 29, 1980
4192051 Method for manufacturing fully sealed piston ring Mar. 11, 1980
4103594 Piston and scraper ring assembly Aug. 1, 1978
4079949 Integral spring piston ring Mar. 21, 1978

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