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 |
| 8047057 | Output mode switching apparatus An output mode switching apparatus including a power unit, a hammering unit, an output shaft, a housing, and a shifting member is provided. The hammering unit includes a gasket cup, a switching ring, a spring member, a hammering seat, and a main shaft. When the powe... | 11/01/2011 |
| 7263878 | Method for identifying tire characteristics The present invention relates to a method of detecting growth of the dynamic tire circumference (circumferential growth or tire growth), wherein at least one reference value Ref is produced on the basis of wheel speed information, said reference value representing i... | 09/04/2007 |
| 5767398 | Tire leak detector for an automatic inflation system An improvement in an air inflation system for a vehicle of an improved sensor for detecting an air leak including an air flow restriction positioned in the air connection between the air supply and the tires and an air actuated differential pressure switc... | 06/16/1998 |
| 5226315 | Device for surveillance of a gas-filled chamber to monitor leaks A device for monitoring the sealing properties of a gas-filled chamber is provided. The temperature-sensitive device is formed out of a thermally-reacting element (14, 19, 20, 24). The element changes its dimensional length depending on a temperature chan... | 07/13/1993 |
| 4590794 | Leak detector for pneumatic tire valve core A valve stem core leak detector is provided that facilitates the repair of pneumatic tires, by indicating whether or not a tire failure is due to a malfunctioning valve stem core. The valve stem core can be tested without removal of the tire from its supp... | 05/27/1986 |
