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| Number | Title | Issue Date |
| 7316268 | Method for conditioning wellbore fluids and sucker rod therefore Invention refers to a method for conditioning wellbore fluids and to a sucker rod to accomplish the method used in the field of petroleum production. The method the invention refers to involves fact that the injection of the conditioning fluids is done directly thro... | 01/08/2008 |
| 6358023 | Moment pump The moment pump (10) of the present invention includes a flexible container (12) having an outer wall (14) and two opposing end walls (16, 18) attached thereto. The container (12) is made of a resilient material and has a preformed, non-biased shape. A pa... | 03/19/2002 |
| 4979878 | Relieved piston valve for fluid motor and fluid pump An asymmetrical or relieved piston is provided in a fluid motor or a pump. The piston is rigidly connected to one end of the connecting rod, the opposite end of which is pivotally connected to a rotating crankshaft. The piston has a relieved upper and low... | 12/25/1990 |
| 4750868 | Pump with continuous inflow and pulsating outflow A pump with a continuous inflow and a pulsating outflow comprises a first chamber and a second chamber with a passage between them and made at least partly from a flexible material. There is an inlet to the first chamber and an outlet from the second cham... | 06/14/1988 |
| 4718832 | Electromagnetic reciprocating pump Electromagnetic reciprocating pump including a plurality of pumps combined in such a manner that the mode of connection between the suction inlet and the discharge outlet in each of the pumps is allowed to be changed and, as the result, the amount of suct... | 01/12/1988 |
