| Patents for F02F 5 - Piston rings, e.g. associated with piston crown (2,184) |
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| 11/10/2004 | CN1544805A Piston ring for automatically closing and adjusting clearance |
| 11/10/2004 | CN1175247C Method and device for determining state of pair in cylinder of internal combustion engine |
| 11/04/2004 | WO2004094809A1 Oil ring, method of producing the same, and piston structure using the oil ring |
| 11/04/2004 | US20040217550 Piston ring for internal combustion engine and internal combusion engine using the same |
| 10/27/2004 | EP1001156B1 An oil sealing ring |
| 10/27/2004 | CN2651453Y High seal piston rings |
| 10/21/2004 | DE10061750B4 Wolframhaltige Verschleißschutzschicht für Kolbenringe Tungsten-containing anti-wear layer for piston rings |
| 10/20/2004 | CN2649792Y Snap piston ring |
| 10/13/2004 | EP1467129A1 Spraying piston ring |
| 10/13/2004 | CN2648187Y Efficient booster piston ring |
| 10/13/2004 | CN1170956C Nano Ti-base ceramic covered piston ring and its mfg. method |
| 09/21/2004 | US6793222 Oil scraper piston ring having circumferentially distributed recesses |
| 09/09/2004 | US20040173169 Cooled ring carrier for a piston |
| 09/01/2004 | EP1341946B1 Wear protection layer for piston rings, containing wolfram carbide and chromium carbide |
| 08/04/2004 | CN2630509Y Single sheet and combined matched piston ring for internal combustion engine |
| 07/28/2004 | CN1515792A Seal of piston and ring |
| 07/21/2004 | CN1514125A 组合油环 Combination oil ring |
| 07/14/2004 | CN1157532C Efficient sealed piston with two ring sets and piston ring assembly |
| 07/07/2004 | CN2623892Y Impregnated ceramics piston ring |
| 06/30/2004 | CN2622408Y Socket type piston seal ring |
| 06/30/2004 | CN2622407Y Two-ring lapped combining and mutual blocking type piston ring |
| 06/24/2004 | US20040119242 Combined oil ring |
| 06/23/2004 | EP1431630A2 Combined oil ring |
| 06/09/2004 | CN1502800A Three combined piston ring |
| 06/02/2004 | CN1501986A Wear-resistant sliding member |
| 05/26/2004 | CN1500154A Nickel-aluminide based wear-resistant material for piston rings |
| 05/26/2004 | CN1500153A Intermetallic wear-resistant material for piston rings |
| 05/19/2004 | CN2616698Y Piston ring for cylinder |
| 05/19/2004 | CN1497147A Sliding structure for vehicle engine |
| 05/19/2004 | CN1150402C Tension measuring apparatus and method for piston ring |
| 05/12/2004 | CN1496457A 往复活塞式发动机 Reciprocating piston engine |
| 05/05/2004 | CN1494641A Side rail for reduction of oil consumption and combined oil control ring in corporated with the side rails |
| 04/29/2004 | US20040080114 Intermetallic wear-resistant material for piston rings |
| 04/28/2004 | EP1413806A1 Steel piston ring |
| 04/28/2004 | CN1492978A Piston ring and method for producing the same |
| 04/27/2004 | US6726218 Compression piston ring for use in internal combustion engine |
| 04/27/2004 | US6726217 Piston ring for the piston of an internal combustion engine |
| 04/22/2004 | US20040076851 Nickel-aluminide based wear resistant material for piston rings |
| 04/22/2004 | US20040074467 Sliding structure for automotive engine |
| 04/21/2004 | EP1411145A1 Sliding structure for automotive engine |
| 04/21/2004 | EP1409896A1 Oil-scraper piston ring and a method for producing an oil-scraper piston ring |
| 04/15/2004 | US20040069141 Wear protection layer for piston rings, containing wolfram carbide and chromium carbide |
| 04/14/2004 | EP1407173A2 Cooled ring carrier for a piston |
| 04/14/2004 | CN2611618Y Crossing piston ring |
| 04/14/2004 | CN1488849A 组合式密封活塞环 Combined piston ring seal |
| 04/06/2004 | US6715465 Internal combustion engine with valve control |
| 04/01/2004 | US20040061291 Side rail and combined oil control ring incorporated with the side rails for reduction of oil consumption |
| 03/31/2004 | CN2608707Y Combined piston ring and piston ring-piston assembly |
| 03/31/2004 | CN2608706Y Main, secondary ring compoiste setting sealing type piston ring |
| 03/30/2004 | US6712039 Internal combustion engines |
| 03/25/2004 | US20040056425 Piston ring and method of producing the same |
| 03/17/2004 | CN2606804Y Novel chromium plated piston ring |
| 03/16/2004 | US6705616 Piston ring device in internal combustion engine |
| 03/11/2004 | DE10339711A1 Kolben mit Kolbenring Piston with piston ring |
| 03/09/2004 | US6703145 Process for electrolytic coating of a substrate and product produced |
| 03/04/2004 | US20040040631 Nitriding surface of martensite stainless steels |
| 03/04/2004 | US20040040436 Combination of piston and piston ring |
| 03/03/2004 | CN2605391Y Fully-sealed multifunctional piston ring |
| 03/02/2004 | US6698763 Piston ring |
| 02/25/2004 | EP1390648A1 Oil ring for an internal combustion engine |
| 02/12/2004 | US20040026062 Method of producing by casting a piston with a cooled ring carrier |
| 02/12/2004 | DE10207078B4 Kolbenring mit einer PVD-Beschichtung Piston ring with a PVD coating |
| 02/05/2004 | US20040021270 Two piece oil control ring with nitrided surface layers |
| 02/04/2004 | CN1473250A 钢制活塞环 Steel piston ring |
| 02/04/2004 | CN1473249A Two piece oil control ring with nitrided surface layers |
| 02/03/2004 | US6685193 Self lubricating, non-sealing piston ring for an internal combustion fastener driving tool |
| 01/22/2004 | US20040012153 Steel piston ring |
| 01/14/2004 | EP1379705A1 Intermetallic wear-resistant material for piston rings |
| 01/14/2004 | CN2599260Y Composite flexible sealed piston ring |
| 01/14/2004 | CN2599259Y Energy saving wear-resisting integral combined piston ring oil ring |
| 01/13/2004 | US6675762 Piston assembly having counterflow thwarting construction for use in an internal combustion engine |
| 01/07/2004 | EP1377766A1 Side rail and combined oil control ring incorporated with the side rails for reduction of oil consumption |
| 01/02/2004 | EP1375695A1 Wear-resistant sliding member |
| 01/02/2004 | EP1373587A1 Nickel-aluminide based wear resistant material for piston rings |
| 12/31/2003 | WO2004001215A1 Reciprocating engine |
| 12/31/2003 | CN2596042Y Spiral piston ring |
| 12/31/2003 | CA2487862A1 Reciprocating engine |
| 12/24/2003 | DE19942241C2 Hubkolbenmaschine Reciprocating engine |
| 12/17/2003 | CN2592881Y Sealing gasket of piston ring |
| 12/17/2003 | CN2592880Y Combined oil ring |
| 12/03/2003 | EP1366314A1 Reciprocating engine |
| 12/03/2003 | CN1459557A Piston ring and mating piston |
| 11/26/2003 | CN2588063Y Sealing piston ring |
| 11/26/2003 | CN1458983A Piston ring excellent in resistance to scuffing, cracking and fatigue and method for producing same, and combination of piston ring and cylinder block |
| 11/26/2003 | CN1128926C 活塞环 Piston |
| 11/25/2003 | US6651606 Piston assembly having counterflow thwarting construction for use in an internal combustion engine |
| 11/12/2003 | CN2585986Y Automobile motorcycle engine piston ring gas ring with seal loop and slot |
| 11/05/2003 | EP1359351A1 Piston ring and method of producing the same |
| 11/05/2003 | CN2584846Y Piston ring with closed device for open |
| 10/23/2003 | US20030196546 Piston apparatus composed of metal piston ring without kerf |
| 10/22/2003 | CN2581706Y Piston ring |
| 10/15/2003 | CN1448627A 活塞环 Piston |
| 10/14/2003 | US6631908 Compression piston ring |
| 10/14/2003 | US6631907 Nitride-plated piston ring for internal combustion engines |
| 10/08/2003 | CN2578536Y Piston ring of motorcycle |
| 10/02/2003 | US20030184023 Piston ring |
| 09/25/2003 | US20030180565 Thermally applied coating for piston rings, consisting of mechanically alloyed powders |
| 09/10/2003 | EP1341946A1 Wear protection layer for piston rings, containing wolfram carbide and chromium carbide |
| 09/04/2003 | WO2003072845A1 Thermal spraying of a piston ring |
| 08/28/2003 | WO2003070999A1 Piston ring comprising a pvd coating |