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| Number | Title | Issue Date |
| 7117961 | Dynamic seal with soft interface A device and method for dynamically sealing between rotatable members such as a rolling cone of a rock bit. The assembly includes a seal ring having a facing surface of a relatively hard material, such as hardened steel or tungsten carbide, and a second seal ring of... | 10/10/2006 |
| 5392692 | Antiblow-by piston and seal construction for high temperature applications A piston and ring assembly operative within a cylindrical bore wall to retain fluid to one side of the assembly, comprising a piston having at least one annular stepped groove in the side wall of the piston, the groove being stepped into uppermost and low... | 02/28/1995 |
| 5235900 | Rotary actuator device having an annular piston rod A rotary actuator device having an annular piston rod, the device comprising at least one piston held provided with sealing means and co-operating with an annular piston rod mounted so as to be capable of moving in an annular chamber, together with means ... | 08/17/1993 |
| 5048592 | Plunger for a diecasting machine A plunger for forcing molten aluminum or brass out of a casting cylinder of a diecasting machine includes a cap which is screwed via an internal thread onto an external thread of a supporting body and is made of a material, in particular a copper alloy, w... | 09/17/1991 |
| 4743033 | Dynamic seal assembly for piston and cylinder operating in subterranean wells A dynamic seal for effecting the sealing of a piston which is axially movable in a cylinder bore comprising a primary sealing element formed of a non-elastomeric sealing material having a hub portion secured to the piston element and an outwardly flaring ... | 05/10/1988 |
| 4741543 | Piston scraper ring A cylinder and piston assembly with an oil scraper ring having a radially washer seated in a radial piston groove, and a scraping skirt having a radially resilient truncated portion with the base edge engaging the cylinder wall in a scraping line located ... | 05/03/1988 |
| 4531581 | Piston actuated high temperature well packer A well packer for use in a well bore having initially retracted packing seal and slip means which are actuated by hydraulic pistons, the improvement in various seals which allow the packer to be used in high temperature environments. The pistons are ring ... | 07/30/1985 |
| 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 |
| 4152820 | Method of expanding shot tip A method of expanding the shot tip in a die cast machine to maintain a sealing fit between the cold chamber and shot tip includes positioning a separate tool with an annular projecting beveled rim in the cold chamber and between the chamber and the movabl... | 05/08/1979 |
| 3994208 | Piston for high-pressure hydraulic machine The present invention concerns a piston for high pressure hydraulic machines. Said piston comprises a cylindrical body having at the periphery thereof a resiliently deformable cylindrical flange which, in use, forms a tight seal with the cylinder, the fla... | 11/30/1976 |
