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 |
| 6179470 | Self-lubricating bearing According to the present invention, a bearing assembly includes a rotatable hub and a porous bearing surrounding the hub, a sprocket surrounding the bearing, and means for rotating the hub relative to the bearing. The porous bearing includes "lubricant ch... | 01/30/2001 |
| 4152031 | Track roller with oil filter An improved tractor roller or idler assembly for a track-type tractor. A stationary shaft is secured to the major or minor bogie. The shaft has an internal cavity which retains a supply of lubricating oil. Radially extending passageways are projected thro... | 05/01/1979 |
