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Class Information
Number: 277/434
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
Description: Dynamic seal comprising an annular seal provided for a part (i.e., a piston) that reciprocates along an axis of an enclosing wall and the seal is for engaging the wall; means to outwardly bias the seal against the enclosing wall; or means (e.g., a seat, etc.) on the part reciprocating along the axis of the enclosing wall to locate or retain the seal or biasing means in an operative position.

Sub-classes under this class:

Class Number Class Name Patents
277/447 Floating piston ring 23
277/435 Having installation, removal assembly, disassembly, or repair feature 54
277/467 Particular piston ring expander 70
277/449 Particular piston seat 39
277/466 Piston ring displays twisting or torsion 26
277/436 Piston ring having peripheral radially sealing flexible projection (e.g., piston cup, etc.) 108
277/458 Piston ring having single piece noncircular or multiturn (e.g., helical, spiral, oblong, elliptical, polygonal, etc.) shape 9
277/459 Piston ring including exposed port, slot, pocket, groove, channel, recess, or bevel 27
277/440 Piston ring surface of dissimilar material or hardness 37
277/445 Rotation limiting feature (i.e., antirotation) 14
277/489 Sectional piston ring structure 16
277/493 Segmented piston ring 17
277/494 Separate bridging piece for gap in piston ring 5
277/496 Split single piece piston ring having opposed asymmetrical mirrored ends 26
277/498 Split single piece piston ring having other than opposed asymmetrical mirrored ends 11

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8597797 Chromium nitride ion-plating coating and its production method, as well as piston ring used for internal combustion engine Dec. 3, 2013
8555850 Two-piece compression piston ring of an internal combustion engine Oct. 15, 2013
8517230 Valve and method for dense phase flow control Aug. 27, 2013
8517679 Compressor-side shaft seal of an exhaust-gas turbocharger Aug. 27, 2013
8403334 Multi-rail piston ring Mar. 26, 2013
8371585 Oil wiper ring Feb. 12, 2013
8342373 Valve and method for dense phase flow control Jan. 1, 2013
8240676 Piston ring Aug. 14, 2012
8157268 Piston for internal combustion engines Apr. 17, 2012
8028997 Resin seal ring and manufacturing method Oct. 4, 2011
7954822 Wire material for coil expander and coil expander Jun. 7, 2011
7913881 Viscous material dispenser piston Mar. 29, 2011
7797829 Oil ring, manufacturing method thereof, and piston structure using the oil ring Sep. 21, 2010
7730866 Sealing device Jun. 8, 2010
7520538 Orbital tube welding purge adaptor Apr. 21, 2009
7510196 Oil ring for internal combustion engine Mar. 31, 2009
7458585 Sliding member and production process thereof Dec. 2, 2008
7429047 Piston ring assembly Sep. 30, 2008
7429048 Piston ring with projection Sep. 30, 2008
7396018 Oil scraper ring for pistons of internal combustion engines Jul. 8, 2008
7325562 Heated seal air for valve and regenerative thermal oxidizer containing same Feb. 5, 2008
7322377 Hydraulic accumulator Jan. 29, 2008
7306232 Multipart oil wiping ring for pistons of internal combustion engines Dec. 11, 2007
7261301 Oil scraper ring for pistons of internal combustion engines Aug. 28, 2007
7207571 Steel piston ring Apr. 24, 2007
7188477 High temperature dynamic seal for scramjet variable geometry Mar. 13, 2007
7172200 Sealing arrangement on piston rods Feb. 6, 2007
7144017 Piston ring having wear resistant composition Dec. 5, 2006
7077402 Combined oil ring Jul. 18, 2006
7052018 Piston ring having wear resistant composition May. 30, 2006
7044473 Piston and piston ring assembly May. 16, 2006
7044472 Combined steel oil control ring May. 16, 2006
7036823 Side rail and combined oil control ring incorporated with the side rails for reduction of oil consumption May. 2, 2006
6962343 Seal ring Nov. 8, 2005
6959930 Combination oil scrapper ring/gas seal assembly Nov. 1, 2005
6863277 Piston ring for the piston of a vibration damper Mar. 8, 2005
6860485 Piston ring Mar. 1, 2005
6838196 Nickel-aluminide based wear resistant material for piston rings Jan. 4, 2005
6834861 Two piece oil control ring with nitrided surface layers Dec. 28, 2004
6832671 Torque converter clutch apply valve Dec. 21, 2004
6793222 Oil scraper piston ring having circumferentially distributed recesses Sep. 21, 2004
6726216 Piston ring with oxide-nitride composite layer Apr. 27, 2004
6719297 Piston ring, in particular for a piston of a vibration damper Apr. 13, 2004
6705616 Piston ring device in internal combustion engine Mar. 16, 2004
6698763 Piston ring Mar. 2, 2004
6485026 Non-stainless steel nitrided piston ring, and method of making the same Nov. 26, 2002
6454271 Combined oil ring Sep. 24, 2002
6439578 Sealing ring combination Aug. 27, 2002
6439351 Brake for a hydraulic vehicle brake system, sealing ring for such a brake and method for producing such a sealing ring Aug. 27, 2002
6419234 Oil sealing ring Jul. 16, 2002

1 2 3

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