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| Number | Title | Issue Date |
| 7172028 | Reciprocating slickline pump A reciprocating hydraulic slickline pump for use in a wellbore. The pump comprises a pump member. The pump member is reciprocated axially by slickline in order to form an upstroke and downstroke. The pump is configured such that it pressurizes fluid within a workstr... | 02/06/2007 |
| 6908290 | Air conditioning compressor having reduced suction pulsation A compressor for an automotive air conditioning system includes a cylinder head that comprises a mixing chamber, suction chamber and discharge chamber. The cylinder head comprises a first annular wall defining a mixing chamber and a second annular wall disposed abou... | 06/21/2005 |
| 6746220 | Pressure fluid-delivery device A pressure fluid-delivery device comprising a cylinder, a piston and a reservoir for a fluid. A V-seal is mounted in an annulus between the cylinder and the piston. An axial movement of the piston forwards relative to the cylinder results in a delivery of a pressure... | 06/08/2004 |
| 6695060 | Downhole pumping system A downhole pump system allows fluid to be pumped from a well to the surface through a production tubing string, while also allowing the downhole pump 10 to be retrieved to the surface while the production tubing string remains in the well. The downhole pu... | 02/24/2004 |
| 6045342 | Refrigerant compressor A compressor has a cylinder bore in a housing. The cylinder bore receives gas from a suction port and discharge the gas out of the compressor through a discharge port. A suction valve is provided with the suction port through which the gas flows with puls... | 04/04/2000 |
| 6016691 | Calibrated toggle lever of leak detection module pump A module for an on-board evaporative emission leak detection system that detects leakage from an evaporative emission space of an automotive vehicle fuel system, and corresponding method that calibrates a leak detection module pump to set a desired stroke... | 01/25/2000 |
| 5351752 | Artificial lifting system An artificial lifting system is designed for use at a pumping installation which has a pump drive at the surface or head end of a well and a reciprocating pump positioned in the lower end of the well. The artificial lifting system has a tubing string conn... | 10/04/1994 |
| 5141411 | Center-anchored, rod actuated pump A fluid pump which is particularly useful in relatively deep and/or low pressure stripper wells. Stripper wells tend to produce sporadically and/or occasionally produce gas, and are often very sandy, have a tendency to become gas locked, and are susceptib... | 08/25/1992 |
| 5048604 | Sucker rod actuated intake valve assembly for insert subsurface reciprocating pumps The invention is drawn to an improved inlet valve assembly for use in subsurface sucker rod operated reciprocating piston pumps. The inlet valve or standing valve is locked in the closed position when the pump is unanchored from the production tubing to p... | 09/17/1991 |
| 5005651 | Downhole pump unseating apparatus and method A fluid producing well has a downhole pump assembly located at a lower end of a tubing string for producing fluid from a pay zone. Some parts of the pump are affixed to a hold-down and the hold-down is telescopingly received in sealed relationship within ... | 04/09/1991 |
| 4957161 | Device for pumping a fluid at the bottom of a well The device comprises a tubing (4) whose lower end is connected to a seat (5) on which bears a gear pump (6). The pump (6) comprises a pump case whose lower portion (10a) is engaged in a bore (5b) of the pump seat (5) and is connected to a cylindrical heav... | 09/18/1990 |
| 4286663 | Hydraulic pumping rod connecting and disconnecting device A pumping rod connecting and disconnecting device comprises: a lower production tubing column and an upper production tubing column having a larger diameter than that of the lower column; a connecting piece provided with a circular seat and a circular gro... | 09/01/1981 |
