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.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 6894575 | High-voltage oscillator having a fast response time A high-voltage oscillator including a first normally-on switch in series with a resonant circuit, a second normally-on switch in parallel with the resonant circuit, and a control circuit preventing the simultaneous conduction of the two switches. ... | 05/17/2005 |
| 4888565 | Apparatus for generating ultrasonic signals An ultrasonic generator, particularly for use in ultrasonic cleaning systems, provides a constant ultrasonic power output for a cleaning tank or chamber. A generator output stage fed from an unsmoothed mains power supply receives signals from an oscillato... | 12/19/1989 |
| 4459595 | Condition responsive RF transmitting device A device mounted on a power transmission device of a vehicle is utilized for transmitting an RF signal when a predetermined parameter exists in the power transmission device wherein the RF signal is capable of being received at a remote location. An elect... | 07/10/1984 |
| 4191188 | Variable crest factor high frequency generator apparatus A high frequency power oscillator is keyed on and off to provide high frequency signal bursts under the control of a pair of timers whose duty cycles are simultaneously and proportionally adjusted so that the signal bursts are constantly centered about th... | 03/04/1980 |
| 4100505 | Variable crest factor high frequency generator apparatus A high frequency power oscillator is keyed on and off to provide high frequency signal bursts under the control of a pair of timers whose duty cycles are simultaneously and proportionally adjusted so that the signal bursts are constantly centered about th... | 07/11/1978 |
