| Patents for F02F 5 - Piston rings, e.g. associated with piston crown (2,184) |
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| 10/03/1991 | WO1991014890A1 Stuffing box seal for piston rods |
| 10/01/1991 | US5052698 Two-piece type oil ring assembly |
| 08/28/1991 | CN2083635U Slope surface piling type gap free piston ring |
| 08/13/1991 | US5039116 Composite oil-ring |
| 07/30/1991 | US5035210 Piston assembly of internal combustion engine |
| 07/19/1991 | WO1991010826A1 Piston ring device for piston reciprocating machines, mainly for internal combustion engines |
| 07/19/1991 | CA2049320A1 Piston ring device for piston reciprocating machines, mainly for internal combustion engines |
| 07/10/1991 | CN2080567U Multilayer composite piston ring |
| 06/26/1991 | EP0434116A1 A piston and cylinder arrangment, more especially for a reciprocator or a high pressure internal combustion engine |
| 03/27/1991 | CN2073939U Double ring groove piston and piston ring of internal combustion engine |
| 03/26/1991 | US5002025 Lubricating oil permeable cylinder wall ring |
| 03/26/1991 | US5001965 Piston and piston ring |
| 02/27/1991 | CN1049543A 活塞环 Piston |
| 02/06/1991 | EP0411913A1 Piston assembly of internal combustion engine |
| 01/09/1991 | CN2069026U Piston ring |
| 12/25/1990 | US4979757 Oil ring assembly |
| 12/12/1990 | CN2067320U Two-ring complementary piston ring |
| 11/27/1990 | US4973066 Piston ring |
| 11/14/1990 | EP0397006A1 Piston ring |
| 10/30/1990 | US4966068 Split ceramic piston ring arrangement with nested biasing ring |
| 10/09/1990 | CA1275013A1 Piston and piston ring |
| 08/14/1990 | CA1272645A1 Multisectional lifting piston for internal-combustion engines |
| 06/19/1990 | US4934350 Method to prevent piston ring rotation |
| 06/14/1990 | WO1990006459A1 Piston rings |
| 06/07/1990 | DE3936813C1 IC engine air buffer system - consists of blind bores in area of cylinder swept by piston rings |
| 05/16/1990 | EP0368004A1 Piston |
| 05/09/1990 | EP0366983A1 Piston |
| 05/04/1990 | CA2000798A1 Piston ring |
| 02/27/1990 | US4905317 Path memory control method in Viterbi decoder |
| 02/13/1990 | US4899702 For an internal combustion engine |
| 01/24/1990 | EP0351976A2 Pistons |
| 01/03/1990 | CN1006305B Plasma spray coating material for strengthening piston ring surfaces |
| 12/27/1989 | CN2050080U Chinkless piston ring |
| 12/07/1989 | DE3917951A1 Nitrided piston ring |
| 11/28/1989 | US4883029 Piston and piston ring construction |
| 11/08/1989 | CN2047308U Built-up air ring |
| 11/07/1989 | CA1262744A1 Dual spring expander for oil control piston rings |
| 10/19/1989 | DE3836796A1 Piston ring arrangement |
| 10/11/1989 | EP0222864B1 Multiple part oil-control ring for piston |
| 06/26/1989 | EP0305504A4 High pressure reciprocator components. |
| 05/30/1989 | CA1254803A1 Pistons for internal combustion engines |
| 04/26/1989 | CN1032571A Piston ring using in reciprocating engines |
| 03/08/1989 | EP0305504A1 High pressure reciprocator components. |
| 03/07/1989 | US4809646 Two)cycle internal combustion engine |
| 01/05/1989 | DE3812656A1 Piston ring with a wear-resistant hard layer and a layer of nickel applied to it by plating |
| 11/16/1988 | CN87214471U Piston ring used in reciprocating engine |
| 10/05/1988 | CN85108421B Method of manufacturing piston ring |
| 10/04/1988 | US4774917 Piston and piston ring for an internal combustion engine |
| 09/22/1988 | WO1988007129A1 High pressure reciprocator components |
| 08/09/1988 | US4762329 Spacer expander for piston rings |
| 08/03/1988 | CN87206434U Wedge shape compose type air sealing piston ring |
| 08/02/1988 | US4761340 Ceramics sliding member |
| 07/26/1988 | US4759266 Multiple part oil-control ring for piston |
| 07/12/1988 | CA1239062A1 Piston and piston ring assemblies |
| 06/21/1988 | US4751871 Multisectional piston with plural ceramic parts and rigidly connected piston rod for use in horizontally opposed piston internal combustion engine |
| 05/11/1988 | CN87206636U Piston unit with guide rings |
| 05/03/1988 | US4741543 Piston scraper ring |
| 04/13/1988 | CN86106714A Plasma spray coating material for strengthening piston ring surface |
| 03/30/1988 | EP0165417B1 Piston ring |
| 02/02/1988 | US4722535 Oil ring structure having reduced rigidity |
| 01/20/1988 | CN87202178U Energy-saving and durable piston ring for reciprocating engine |
| 01/13/1988 | EP0252728A2 Metallic slide members to be used with ceramic slide members and sliding assemblies using the same |
| 11/17/1987 | US4706971 Seal ring for piston rods with partings |
| 10/08/1987 | WO1987006081A1 Method of controlling path memory in viterbi decoder |
| 10/07/1987 | EP0240092A1 Improvements in or relating to pistons for internal combustion engines |
| 09/23/1987 | EP0238152A2 Improvements in or relating to pistons for internal combustion engines |
| 09/22/1987 | US4695064 Piston ring assembly and expander |
| 09/16/1987 | EP0237377A1 Oil-scraping ring and structure of pistons sliding in cylinders, such as an internal-combustion engine comprising such rings |
| 07/08/1987 | CN86204257U Fully sealed piston ring set |
| 07/07/1987 | US4677900 Pistons for internal combustion engines |
| 06/02/1987 | US4669369 Piston and piston ring assemblies |
| 05/27/1987 | EP0222864A1 Multiple part oil-control ring for piston. |
| 04/29/1987 | EP0219573A2 Piston ring, in particular an oil control piston ring |
| 04/22/1987 | EP0218607A1 Dual spring expander for oil control piston rings |
| 04/07/1987 | US4655983 Formed form upper and lower annular segments one of which is inverted |
| 03/24/1987 | US4651395 Manufacture of piston rings |
| 03/10/1987 | CA1218908A1 Piston for reciprocating internal combustion engine |
| 01/24/1987 | CN86101804A 活塞环材料 Piston ring material |
| 01/14/1987 | EP0208554A1 Assembly having two members movable in contact |
| 12/16/1986 | US4629198 Oil scraper piston ring assembly |
| 11/20/1986 | WO1986006810A1 Multiple part oil-control ring for piston |
| 11/11/1986 | US4621386 For removing fluid from a moving cylindrical surface |
| 10/15/1986 | EP0197654A2 Engine piston assembly with ceramic top ring |
| 10/15/1986 | EP0197449A2 Multipart piston for an internal-combustion engine |
| 10/07/1986 | US4615261 Stirling engine with improved piston ring assembly |
| 09/12/1986 | WO1986005250A1 Dual spring expander for oil control piston rings |
| 08/27/1986 | EP0192114A2 Piston |
| 08/19/1986 | US4606101 Method of manufacturing a radially corrugated expander-spacer for a piston oil ring assembly |
| 08/13/1986 | CN86100808A Piston and piston ring |
| 07/01/1986 | US4597939 Molybdenum; molybdenum carbide, low melting alloy |
| 06/10/1986 | CN85108421A Method of manufacturing piston ring |
| 06/03/1986 | US4592964 Wear-resistant coating |
| 05/14/1986 | EP0181021A2 Stirling engine with improved piston ring assembly |
| 04/01/1986 | US4579355 Nitrided steel piston ring with oxide film |
| 04/01/1986 | US4579351 Dual spring expander for oil control piston rings |
| 03/11/1986 | US4575107 Piston rings for internal combustion engine |
| 03/05/1986 | EP0173600A1 Piston for an internal-combustion engine or compressor |
| 03/05/1986 | EP0173499A1 Piston rings |
| 02/25/1986 | US4572520 Multi-component steel piston ring with rotation preventing rivet |
| 02/12/1986 | EP0171221A2 Improvements in or relating to pistons for internal combustion engines |