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| Number | Title | Issue Date |
| 7997185 | Piston ring A piston has a body with a first circumferentially disposed groove. A first ring is movably disposed within the first groove. The first ring defines an inner circumferential groove. A blocking ring is at least partially located in the groove of the first ring and th... | 08/16/2011 |
| 7461583 | Variable tension ring mechanism A piston assembly is described including a connecting rod and a piston head secured to the connecting rod and in operational communication with the connecting rod. The piston head has a circumferential groove extending inwardly from an exterior surface of the piston... | 12/09/2008 |
| 6484622 | Variable oil ring tension mechanism A variable oil ring compression mechanism provides for real-time cyclic variation of piston ring tension in an operating internal combustion engine. A cam is situated in the gap of a piston oil control ring, the cam affixed to a shaft secured to a pivot p... | 11/26/2002 |
| 5052275 | Horizontal reciprocating compressor with an eccentrically adjustable piston therein The horizontal reciprocating compressor is provided with a cylinder, piston and piston rod connected to the piston. An eccentric ring is mounted eccentrically within the piston and rotatably receives the piston rod. Rotation of the eccentric ring from tim... | 10/01/1991 |
| 4926811 | Internal combustion engines An internal combustion engine includes a piston mounted for reciprocating motion within a cylinder and sealed with respect thereto. The piston is connected to a crankshaft by means of a connecting rod, pivotal connections being provided between the connec... | 05/22/1990 |
| 4890542 | High-pressure-fluid machine, a seal The seal, for use especially in non-lubricated, high-pressure, as compressors, in a one-piece, continuous sleeve which envelopes a reciprocable piston for sealing against the piston, or against the cylinder in which the piston translates. One end of the s... | 01/02/1990 |
| 4875405 | Sealing device A sealing device particularly suitable for sealing pistons of working cylinders and for sealing two machine components which can slide against one another is disclosed. A conventional sealing element consisting of low-friction, but not very elastic materi... | 10/24/1989 |
