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| Number | Title | Issue Date |
| 6973971 | Down hole well cleaning apparatus An apparatus and a method for cleaning the open perforations in a well and for bailing a well. The apparatus has a tubular conduit with at least one seal attached to it that forms a seal between the well casing and the exterior of the conduit. The seal is held in pl... | 12/13/2005 |
| 6938538 | Bore seal telescopic hoist A bore seal telescopic hoist is formed of a series of telescopically arranged tubular sections each having a circumferential reservoir. A circumferential wiper is lodged in the reservoir and is used to collect debris or dirt which may be present on the inner wall of... | 09/06/2005 |
| 6212998 | Packings on pump rod A design for a packing assembly for a reciprocating piston pump is shown which allows for tighter tolerancing and increased packing life.... | 04/10/2001 |
| 6186747 | Axial plunger slurry pump An axial plunger slurry pump comprises a pump body, a sloping cam plate, a swashplate, cylinders, plungers and a pump head. Each of the plungers comprises a plunger body with a rubber piston positioned in its front end and being able to slide over it, and... | 02/13/2001 |
| 5293811 | Missile control fin actuator system A control fin actuator (28) for a guided missile (20) includes a pressure actuator (40) having a slidable piston (44) inside a housing (42). Rolling diaphragm seals (50, 56) of the top piston face (46) and the bottom piston face (48) to the inside wall of... | 03/15/1994 |
| 4735129 | Single acting mud pump piston Disclosed is a single acting mud pump piston assembly adapted for use in a mud pump mechanism including a piston and having an end portion with a shoulder reciprocatingly mounted in a cylinder. The assembly includes a circular flange mounted on the end po... | 04/05/1988 |
| 4697992 | Piston ring for a piston in a refrigerant compressor A refrigerant compressor includes a piston with two circumferential grooves on the outer surface of the piston, one of the grooves being located near the top and the other near the bottom. Conical piston rings made of plastic are disposed in the grooves. ... | 10/06/1987 |
| 4598630 | Double acting self-flushing pump A double action slurry pump is provided having a shelf-flushing piston assembly mounted in a mating cylinder. The piston assembly includes a first piston having a peripheral sealing means and a reciprocating piston rod for driving the first piston. Second... | 07/08/1986 |
| 4594055 | Piston assembly for a refrigerant compressor A piston assembly for a reciprocating piston type compressor includes a piston slidably disposed within aluminum alloy cylinders. The pistons have two annular grooves provided toward opposite ends on their outer peripheral surfaces. A conical shaped pisto... | 06/10/1986 |
| 4476771 | Self-flushing piston assembly for slurry pump A slurry pump is provided having a self-flushing piston assembly mounted in a mating cylinder. The piston assembly includes a first piston having a peripheral sealing member and a reciprocating piston rod for driving the first piston for pumping action. A... | 10/16/1984 |
| 4346903 | High-pressure seal in piston A high-pressure seal having a dynamic seal ring and a static seal ring supported by a backup ring is improved upon such that support ring is a one-piece construction having sealing chambers respectively defined together with the bore wall of the cylinder ... | 08/31/1982 |
| 4294164 | Piston for use in pneumatically operated piston-cylinder apparatus A piston for use in pneumatically operated piston-cylinder apparatus has a disc-shaped steel core for connection with a piston rod, a sealing ring of resilient material surrounding the core and having an integral sealing lip extending from each axial end ... | 10/13/1981 |
| 4078810 | Piston type seal unit for wells A seal unit for movement through a flow conductor for pumpdown piston or well swab service, including a mandrel body, a seal element mounting sleeve disposed for limited travel on the body, and elastic annular seal means secured on the mounting sleeve to ... | 03/14/1978 |
