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| Number | Title | Issue Date |
| 7647864 | Piston for hydraulic clutch A piston includes a piston main body and a seal ring. The seal ring has a metal ring including a fitting tube portion fitted to a cylinder portion of the piston main body and a flange portion extending radially to axially oppose a pressure receiving portion of the p... | 01/19/2010 |
| 7168361 | High pressure pump piston A high pressure piston for use within a liner for a reciprocating pump comprises an elastomeric seal and an annular bearing ring. During the pump's pressure stroke at least a portion of the bearing ring elastically expands radially to narrow or close the extrusion g... | 01/30/2007 |
| 6957605 | High pressure pump piston A high pressure piston for use within a liner for a reciprocating pump comprises an elastomeric seal and a metallic annular bearing ring having relatively high heat conductivity compared to the liner and seal. During the pump's pressure stroke a portion of the beari... | 10/25/2005 |
| 6675699 | Composite components for use in pumps Composite pump components, such as a connecting rod comprising an elongate body having a core portion made up of concentric laminations or layers, the layers having elements the majority of which extend longitudinally with respect to the connecting rod an... | 01/13/2004 |
| 6085636 | Brake piston In a plastic brake piston for a disc brake, the heat conductivity is improved because the brake piston is provided with an insert member made of a metallic material which extends from end to end through the brake piston.... | 07/11/2000 |
| 5941162 | Piston A piston having a body member made from plastic material adapted for mounting to a piston rod for axial movement with the piston rod in a hydraulic cylinder under high working pressure conditions is disclosed. The plastic piston body member has a first ax... | 08/24/1999 |
| 5480163 | Lip seal with reinforced backup A replaceable sealing member is disclosed which includes a body, lip seal and bonded reinforcement section having a skirt portion and a lip support surface. The skirt portion and lip support restrict elastomeric flow of the body and lip seal portion of th... | 01/02/1996 |
| 5284084 | Light weight piston A lightweight mud pump piston assembly for reciprocating inside of a cylinder. The piston has decreased weight because light weight materials are used to form the majority of the hub which is the heaviest part of the piston. The piston maintains its compr... | 02/08/1994 |
| 5216943 | Piston for hydrostatic axial and radial piston machines and method for the manufacture thereof A method of manufacturing a piston for hydrostatic axial and radial piston machines by non-machining forming, by filling a material that is in a substantially unresistant, formable state into a mold defining a piston outer contour which is closed on all s... | 06/08/1993 |
| 5154109 | Composite piston assembly A method of manufacturing a piston for transferring an output force to another member in response to pressurized fluid being communicated to a bore in a housing. The piston has a cylinder body made of a plurality of triaxial braided layers of carbon fiber... | 10/13/1992 |
| 4970945 | Actuating piston assembly, and seal therefor, for torque transmitting systems An actuating piston assembly (10, 110) for a torque transmitting device (11). The actuating piston assembly (10, 110) has a seal subassembly (35, 135) with a supporting annulus (36, 136) and a seal member (38, 138). The seal member (38, 138) is preferably... | 11/20/1990 |
| 4858516 | Brake cylinder-piston slave unit seal having radial roll-back protrusion for piston spring back retract In a piston-cylinder assembly for hydraulic brake systems of automotive vehicles, the piston is at least partially composed of ceramics. A hydraulic seal is interposed between the piston and the cylinder. To simplify the assembly while allowing comparativ... | 08/22/1989 |
| 4708104 | Reinforced pistons A piston is manufactured by incorporating a reinforcement which is formed at least in part by a fibre material and which is so non-uniform as to provide differing characteristics in the cast piston in predetermined differing regions of the piston. For exa... | 11/24/1987 |
| 4633765 | Piston for precision dosing instrument A piston for a precision dosing instrument includes a cylindrical core which may be made of glass, ceramic or metal, and a precision ground sleeve of polytetrafluorethylene disposed over the core. One end of the sleeve is closed while the core is open at ... | 01/06/1987 |
| 4501192 | Piston for precision dosing instrument A piston for a precision dosing instrument includes a cylindrical core which may be made of glass, ceramic or metal, and a precision ground sleeve of polytetrafluorethylene disposed over the core. One end of the sleeve is closed while the core is open at ... | 02/26/1985 |
| 4319518 | Well swab cups A swab cup for oil wells is provided which comprises means by which the elastic side walls of the cups can be radially expanded almost throughout their entire length. The oil well swab cup has a substantially cylindrical uniform wall thickness resilient a... | 03/16/1982 |
| 4214507 | One-piece plastic piston A piston comprising a core molded from a rigid thermoplastic material and a seal element molded on the core from a flexible thermoplastic material to form a unitary assembly.... | 07/29/1980 |
| 4190108 | Swab This patent application discloses a swab mandrel having thereon a swab with reinforcing wires imbedded at approximately the mid-point of the wall of the swab for a substantial distance to permit the swab to have fluid film lubrication with the tubing in w... | 02/26/1980 |
| 4081185 | Oil well swab cup An oil well swab cup with improved wear characteristics utilizes a single integral reinforcing structure featuring a wear surface forming a substantial portion of the external surface of the cup.... | 03/28/1978 |
