| Patents for F02F 5 - Piston rings, e.g. associated with piston crown (2,184) |
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| 06/09/1998 | US5763106 Ceramic carbide powder containing nickel and chromium, solid lubricant comprising molybdenum disulfide, lead oxide, graphite, silver, titanium oxide |
| 06/03/1998 | EP0739450B1 Seal for a piston-cylinder unit |
| 05/27/1998 | CN1182829A Single groove double-ring piston and piston ring |
| 05/14/1998 | DE19708892C1 Reciprocating internal combustion engine |
| 05/07/1998 | WO1998019084A1 Piston rings and/or a piston in an internal combustion engine of the diesel type and a method of running-in of a diesel engine |
| 05/06/1998 | EP0840039A2 Oil control ring of two piece type for internal combustion engine |
| 05/06/1998 | CN1181122A Internal combustion engine having coke scraping ring in cylinder |
| 04/29/1998 | EP0837982A1 An internal combustion engine having a coke scraping ring in a cylinder |
| 04/22/1998 | CN2279449Y Sealing piston ring for internal combustion engine |
| 04/16/1998 | DE19640789A1 Verschleißfeste beschichtete Bauteile für Verbrennungskraftmaschinen, insbesondere Kolbenringe und Verfahren zu deren Herstellung Wear-resistant coated components for internal combustion engines, in particular piston rings and processes for their preparation |
| 04/15/1998 | CN1178866A Oil-bearing piston ring |
| 04/09/1998 | WO1998014628A1 Coated wear resisting parts for internal combustion engines, specially piston rings, and method for their production |
| 04/08/1998 | CN2278090Y Steel strip combined oil-ring used less than 40 mm diameter |
| 03/26/1998 | WO1998012015A1 Cutting/splitting method and apparatus for piston ring |
| 03/25/1998 | CN2276994Y Lapping piston ring |
| 03/18/1998 | CN1176341A 一槽二环制 A groove bicyclic system |
| 03/10/1998 | US5724933 Piston unit for an internal combustion engine |
| 02/17/1998 | US5718437 Hardness; wear resistance |
| 02/04/1998 | CN2273779Y Double layer position-limited flat surface piston ring |
| 02/03/1998 | US5713129 Method of manufacturing coated piston ring |
| 01/28/1998 | CN1037208C Piston top ring for IC engine |
| 12/18/1997 | WO1997047870A1 Cylinder-piston assembly |
| 12/17/1997 | CN2270814Y Reciprocating piston with piston ring |
| 12/17/1997 | CN2270813Y Combined gaseous ring |
| 11/26/1997 | CN2268785Y Closed position limiting piston ring |
| 11/12/1997 | CN2267330Y Piece insertion type piston ring |
| 10/15/1997 | EP0800627A1 Piston assembly with piston ring support and sealing member |
| 10/01/1997 | EP0797743A1 Piston ring seal |
| 10/01/1997 | CN1160814A Dynamic property improving method for engine and piston ring with flow-chocking notch |
| 09/17/1997 | CN2262607Y Engine cylinder piston rings without opens alignment |
| 09/04/1997 | WO1997032049A1 Cast iron and piston ring |
| 09/03/1997 | CN2261514Y Piston ring of engine |
| 08/13/1997 | CN2259495Y Lap compensating piston ring |
| 07/30/1997 | CN2258539Y Fully closed piston ring unit |
| 07/24/1997 | DE19700835A1 Self-lubricating composite layer production |
| 07/23/1997 | CN2258229Y New piston ring |
| 06/26/1997 | WO1997022820A1 Piston-cylinder assembly |
| 06/26/1997 | DE19653598A1 Metal powder piston ring |
| 06/19/1997 | DE19547157A1 Kolben-Zylinder-Baueinheit Piston-cylinder assembly |
| 06/05/1997 | WO1997013597A3 Process for producing an intermetallic join |
| 06/05/1997 | WO1997013396A3 Reinforcing component of which the basic material is austenitic cast iron |
| 05/28/1997 | EP0742875B1 A piston top ring for an internal combustion engine |
| 04/30/1997 | CN1148663A Improvement for piston ring |
| 04/17/1997 | WO1997013991A1 Piston assembly with piston ring support and sealing member |
| 04/17/1997 | WO1997013597A2 Process for producing an intermetallic join |
| 04/17/1997 | WO1997013396A2 Reinforcing component of which the basic material is austenitic cast iron |
| 04/17/1997 | DE19537848A1 Bewehrungsteil, dessen Grundwerkstoff austenitisches Gußeisen ist Reinforcement part, the base material austenitic cast iron is |
| 04/17/1997 | DE19537847A1 Bewehrungsteil, dessen Grundwerkstoff austenitisches Gußeisen ist Reinforcement part, the base material austenitic cast iron is |
| 04/17/1997 | CA2207433A1 Piston assembly with piston ring support and sealing member |
| 04/16/1997 | CN1147592A Piston ring for combustion engines |
| 04/09/1997 | CN2251626Y Bow shaped door sealing element unit assemblage |
| 04/08/1997 | US5618590 Causing arc discharge in process gas comprising nitrogen or carbon using as cathode targets cobalt, nickel, silicon, titanium, vanadium, chromium, iron, zirconium, niobium, tungsten to form nitride or carbide coatings |
| 04/08/1997 | US5618046 Piston ring assembly |
| 04/03/1997 | WO1997012139A1 The piston compression ring assemblies being self-lubricated and self-adjusted |
| 03/27/1997 | WO1997011295A1 A piston ring for a piston in an internal combustion engine |
| 03/26/1997 | EP0764801A1 Piston ring for combustion engine |
| 03/05/1997 | CN2248782Y Two ends and lapped mouth type piston ring |
| 02/18/1997 | US5603512 Side and gap sealed oil ring |
| 02/12/1997 | CN2247235Y Interlock type single groove double-piece piston ring |
| 02/04/1997 | US5598763 Flutter free piston ring assembly |
| 01/30/1997 | WO1997003280A1 An internal combustion engine having a coke scraping ring in a cylinder |
| 01/28/1997 | US5597657 Metal crystals, slide surface for a mating member, i.e. cam shaft for internal combustion engine |
| 12/25/1996 | CN2243548Y Self lubricating and gap adjusting damping piston ring |
| 12/25/1996 | CN2243547Y High elastic piston ring of IC engine |
| 12/25/1996 | CN1138890A Seal for a piston-cylinder unit |
| 12/25/1996 | CN1033661C Working method of piston ring |
| 12/10/1996 | US5582414 Sliding member and method for manufacturing the same |
| 11/20/1996 | EP0742875A1 A piston top ring for an internal combustion engine |
| 10/30/1996 | EP0739450A1 Seal for a piston-cylinder unit |
| 10/30/1996 | CN1033180C Piston ring for engine and its processing method |
| 10/15/1996 | US5564699 For use in an internal combustion engine |
| 10/01/1996 | US5560283 Piston-Cylinder assembly of an internal combustion engine |
| 09/11/1996 | EP0731268A1 Multipart piston for an internal combustion-engine |
| 08/28/1996 | CN2233988Y Automatic lubricating and gap-adjusting piston ring |
| 08/27/1996 | US5549086 Sliding contact-making structures in internal combustion engine |
| 08/22/1996 | DE19605478A1 Oil-scraper ring for engine piston |
| 08/22/1996 | DE19605457A1 Side and gap sealed oil ring |
| 08/20/1996 | US5547203 Segmented ceramic inlay piston ring |
| 08/14/1996 | CN2232985Y Piston ring and its mating piston |
| 08/14/1996 | CN1032550C Alloy cast iron used for railway motor car cylinder jacket and piston ring |
| 08/07/1996 | CN2232490Y Insertion packing ring |
| 07/31/1996 | CN1127840A Serial seal rings and locating slots for bow door |
| 07/17/1996 | EP0670960B1 Piston-cylinder assembly of an internal combustion engine |
| 07/10/1996 | CN2230822Y Cylinder ring and single ring piston |
| 07/10/1996 | CN2230821Y Fully sealed cylinder ring |
| 07/04/1996 | DE19548931A1 Nitridplattierter Kolbenring für Verbrennungskraftmaschinen Nitridplattierter piston ring for internal combustion engines |
| 07/02/1996 | US5531195 Anti-abrasion |
| 06/26/1996 | CN2229974Y Built-up type piston ring |
| 06/12/1996 | CN2228984Y Joint overlap type piston ring |
| 05/30/1996 | WO1996016285A1 Piston ring seal |
| 05/29/1996 | EP0713962A2 Internal combustion engine |
| 05/23/1996 | WO1996015368A1 Seal for a piston-cylinder unit |
| 05/23/1996 | CA2181169A1 Seal for a piston-cylinder unit |
| 05/15/1996 | EP0711630A1 Flat steel wire for side rails of oil ring in internal combustion engine and manufacturing method |
| 05/14/1996 | US5516560 Using a gun |
| 05/07/1996 | US5513857 Piston sealing ring having interlocking ends |
| 05/01/1996 | CN2226155Y Multi-segment combined piston ring for internal combustion engine |
| 04/24/1996 | CN2225544Y Fully sealed slide and float piston ring |
| 04/24/1996 | CN2225543Y Super hard membrane piston ring |
| 03/06/1996 | CN2221661Y Piston ring |