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 |
| 7866340 | Universal pressure reducer for self-contained breathing apparatus A universal pressure reducer is provided for a self-contained breathing apparatus. The universal pressure reducer includes an inlet, a reducer module in fluid communication with the inlet, a pneumatic alarm mechanism, and a pneumatic transfer valve assembly that con... | 01/11/2011 |
| 7866338 | Quick connect pressure reducer/cylinder valve for self-contained breathing apparatus A breathing air tank and valve assembly is provided for use in a self-contained breathing apparatus. The breathing air tank and valve assembly includes a pressure vessel and a cylinder valve for connection to the pressure vessel. The cylinder valve includes a valve ... | 01/11/2011 |
| 7658190 | Portable air-purifying system utilizing enclosed filters A powered air-purifying respirator that includes an enclosure, defining a single contiguous enclosed interior, an inlet duct, including an inlet and a distribution portion, that guides ambient air to the interior of the enclosure, a plurality of filter canisters dis... | 02/09/2010 |
| 7628152 | Breathing regulator with nonlinear positive pressure spring A breathing regulator having a non-linear positive pressure spring is provided for use in an air supplied respirator. The regulator includes a housing formed from a regulator body and a cover sub-assembly, a diaphragm assembly, and the non-linear spring. The spring ... | 12/08/2009 |
| 7377835 | Personal multimedia communication system and network for emergency services personnel A personal multimedia communication system and network for emergency services personnel includes a plurality of personal communication systems linked together and to a base station in a network. Each personal communication system includes a PDA device mounted on a P... | 05/27/2008 |
| 7263379 | Communications network for emergency services personnel A personal multimedia communication system and network for emergency services personnel includes a plurality of personal communication systems linked together and to a base station in a network. Each personal communication system includes a PDA device mounted on a P... | 08/28/2007 |
