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| Number | Title | Issue Date |
| 7286307 | Method for fixing optical member and optical unit A method for fixing an optical member of an optical unit including the optical member and a holding member is provided. The holding member includes positioning portions for positioning the optical member. The optical member and the holding member are fixed to each o... | 10/23/2007 |
| 6712362 | Primary seals for master-slave cylinder systems In a master/slave cylinder system for clutches or brakes, primary seals have bevels which interact with similar bevels of formations on housings of the respective cylinders. Along with the lowest possible friction in the region of the sealing lips, this permits carr... | 03/30/2004 |
| 6682078 | Ring groove for oil ring with coil expander of piston A ring groove for a two-piece oil ring of a piston is provided that has ring body equipped with a coil expander, wherein the ring body has an upper outer surface and a lower outer surface, both orthogonal to the axial direction of the piston. The ring gro... | 01/27/2004 |
| 6547251 | Ring groove for oil ring with coil expander of piston A ring groove for a two-piece oil ring of a piston is provided that has ring body equipped with a coil expander, wherein the ring body has an upper outer surface and a lower outer surface, both orthogonal to the axial direction of the piston. The ring gro... | 04/15/2003 |
| 5695199 | Piston sealing assembly A sealing assembly that significantly reduces or eliminates blow-by, peristolic pumping and sealing element flutter while, at the same time, reducing to ultra low levels friction between the sealing element and its assembly. The assembly has surfaces in a... | 12/09/1997 |
| 5303683 | Piston with a profiled ring groove A piston with at least one compression ring, a top end and a longitudinally extending axis for an internal combustion engine. The piston includes at least one compression ring groove defined by first and second spaced lateral surfaces for receiving the at... | 04/19/1994 |
| 4676143 | Piston seal device for reciprocating compressor A piston seal device for a reciprocating compressor, having a piston slidably mounted in a cylinder bore and having a circumferential groove, and a resilient piston ring fitted in the circumferential groove of the piston and sealingly engageable with the ... | 06/30/1987 |
| 4582330 | Seal with cleft seating surface An annular or linear seal having a substantially K-shaped cross section. The seal with cleft seating surface provides a two-way pressure barrier when it is installed in a groove having a cross section of "sigma" shape, wherein the flat side of the K-shape... | 04/15/1986 |
| 4362304 | Packing arrangement for a floating piston A packing arrangement for a floating piston dividing a cylinder into first and second chambers comprising a circumferential groove formed in the sliding surface of the floating piston; a circumferential elevation dividing the bottom of the groove into fir... | 12/07/1982 |
| 4350352 | Piston ring and groove assemblies Piston ring and groove assemblies are provided for forming a seal between a piston ring side and an adjacent wall of a piston ring groove during engine operation even when the piston is eccentric or tilted relative to a cylinder within which said piston m... | 09/21/1982 |
| 4350082 | Pump piston having ring lubrication means A downhole oil well hydraulic pump has a reciprocating piston assembly with a piston ring mounted in a groove around the piston. This piston ring groove has a main portion which loosely mounts a piston ring and an auxiliary portion joining the main portio... | 09/21/1982 |
