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| Number | Title | Issue Date |
| 7445435 | Double-acting reciprocating downhole pump A positive displacement pump for pumping fluids from a downhole formation to the earth's surface is provided. The pump first comprises a plunger. The plunger is reciprocated axially within the wellbore by a linear actuator, such as a submersible electrical pump, in ... | 11/04/2008 |
| 6736604 | Control apparatus of variable displacement pump for power steering apparatus First and second fluid pressure chambers are formed in both sides of a movement direction of a cam ring swingably placed within a pump body. A spool of a control valve is moved due to a pressure difference between the front and back of a metering orifice. Fluid pres... | 05/18/2004 |
