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| Number | Title | Issue Date |
| 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 |
| 4986168 | Piston and multilayer piston ring set Compression piston ring for internal combustion or compressor cylinder and piston comprising double layer of segmented ring sectors having free form circumferential curvature matching the cylinder bore. The double layers are adapted to effectively seal or... | 01/22/1991 |
| 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 |
| 4570945 | Piston ring having shape of an ellipse or an elongated circle A piston ring for an internal combustion engine having a piston and a cylinder of an elliptical or oblong circular cross-sectional shape is divided into two or more segments which are connected end to end in a ring. Each of the end-to-end joints between t... | 02/18/1986 |
| 4516481 | Piston and piston rings set New assembly of cylinder, lightweight piston and piston rings for engines and compressors comprising in a cylinder a reduced weight piston provided with a new simpler piston rings set of a high efficiency producing a very small tension against the cylinde... | 05/14/1985 |
