Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 8083504 | Quintuplex mud pump A quintuplex mud pump has a crankshaft supported in the pump by external main bearings. The crankshaft has five eccentric sheaves, two internal main bearing sheaves, and two bull gears. Each of the main bearing sheaves supports the crankshaft by a main bearing. One ... | 12/27/2011 |
| 5572919 | Apparatus for controlling pressure in a cylinder chamber of a hydraulic pump-motor An apparatus controls a pressure in a cylinder chamber of a hydraulic pump-motor. The cylinder chamber is formed by fitting a piston in a cylinder bore of a rotatable cylinder block, and the cylinder block is rotated so that ports going to the cylinder ch... | 11/12/1996 |
| 5540569 | Multiple-chamber gear pump for ink jet printing Pump heads comprising at least two gear-pump chambers are disclosed. Each chamber comprises a housing which defines a corresponding pump cavity. Each cavity contains a driving gear and at least one driven gear and has a separate inlet and outlet. The pump... | 07/30/1996 |
| 5466131 | Multiple-chamber gear pump with hydraulically connected chambers Pump heads comprising at least two gear-pump chambers are disclosed. Each chamber comprises a housing which defines a corresponding pump cavity. Each cavity contains a driving gear and at least one driven gear and has a separate inlet and outlet. The pump... | 11/14/1995 |
| 4711299 | Apparatus and methods for pumping solids and undesirable liquids from a well bore An apparatus and methods for removing sand and debris from a well bore utilizes an elongated string which includes a pump functioning to pump debris into the string interior from the lower end of the well bore. The pump includes a stationary hollow piston... | 12/08/1987 |
