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| Number | Title | Issue Date |
| 7370866 | Sleeve element having a biasable end region, apparatus including same, and method of use A sleeve element having at least one end region configured to be biased into a laterally adjacent recess formed in one of a piston element surface and a bore surface is disclosed. A seal assembly is disclosed including two sleeve elements, each sleeve element having... | 05/13/2008 |
| 7341256 | Seal ring A seal ring which maintains a stable sealing performance over a long term is provided. In a first seal portion, linear contact portions which come into linear contact with the sidewall surface of an annular groove on the unsealed fluid side are continuously extended... | 03/11/2008 |
| 7121552 | Piston ring A piston ring includes a lateral surface which covers a circumferential surface of a piston and support segments with retaining surfaces which engage with the top and bottom of the piston. A piston ring joint allows the piston ring to be elastically deformed in the ... | 10/17/2006 |
| 6397987 | Dashpot piston in halves A dashpot piston in halves, the face of each resting against that of the other. The piston can be fastened to the end of a piston rod either directly or by way of a connector. Each half (1 & 2) is provided with a depression (7) along the circumference rem... | 06/04/2002 |
| 6176492 | Piston ring for shock absorber A number of embodiments of piston sealing arrangements for shock absorbers having a hydraulic cylinder in which a piston is slidably supported to define a pair of fluid chambers. The piston is provided with a peripheral groove in which a sealing piston ri... | 01/23/2001 |
| 5671928 | Seal for chromatography column having ridges An annular seal for chromatography columns adapted for radial sealing with an inner cylindrical surface, having a compressive surface disposed on the inner annular edge of the seal, and a sealing surface disposed on the outer annular edge of the seal, whe... | 09/30/1997 |
| 4928577 | Piston and cylinder unit It is a question of a piston and cylinder unit comprising a cylinder barrel defining a piston space, a piston able to run axially in said barrel with a support action due to a peripheral bearing surface of the barrel. The piston includes at least one annu... | 05/29/1990 |
| 4629200 | Non-metallic piston rings with controlled expansion pressure A piston ring formed from a plastics material and having a maximum pressure against the associated cylinder of between 0.10 and 1.50 MN/m2 and preferably 0.50 MN/m2. One possible material for such piston rings is polyetheretherketone... | 12/16/1986 |
| 4592559 | Piston ring seal with pressure distribution grooves Seal structure for positioning between two members disposed for sliding relative movement includes a band component that is adapted to be carried by one member and that has a front surface for engagement with the other member and a backup component that i... | 06/03/1986 |
| 4557488 | Hydraulic seal with pressure-actuated ridges An elastomeric seal (1), particularly for mining roof supports, has a circumferentially extending primary sealing ridge (4) for sealing against the cylinder wall (15) at both low and high pressure differentials. In order to provide lubrication of the prim... | 12/10/1985 |
| 4522415 | Piston ring for an internal combustion engine A piston ring (1) made of ceramic materials for an internal combustion engine comprising a body made by sintering of partially stabilized zirconium oxide (PSZ) which has a porosity | 06/11/1985 |
| 4452464 | Oil ring An oil ring having an axially and radially thin cross-section and a single cylinder contacting face to bear against the cylinder wall with a pressure of 2 Kg/cm2 to 6 Kg/cm2. The oil ring is dimensioned to satisfy the following equat... | 06/05/1984 |
| 4101140 | Peripherally grooved seal A composite seal for use between a movable element and a static element in a fluid pressure system where pressures vary on opposite sides of the seal. The seal comprises a fluoronated hydrocarbon sealing ring with a finely grooved sealing surface and an e... | 07/18/1978 |
