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 |
| 7434463 | Electrostatic-capacity-type acceleration sensor and acceleration measuring device therewith A moving member having a plurality of moving electrodes is supported by support members at both ends thereof on a substrate surface in such a way that it can be subjected to displacement in a two-dimensional plane. A plurality of fixed electrodes are arranged to fac... | 10/14/2008 |
| 5726359 | Orientation sensor especially suitable for use in an underground boring device An orientation sensor especially suitable for use in an underground device is disclosed herein. This orientation sensor includes a sensor housing defining a closed internal chamber, an arrangement of electrically conductive members in a predetermined posi... | 03/10/1998 |
| 5351539 | Sensor for measuring acceleration and tilt with a bubble level A sensor is proposed which is used for detecting the acceleration and the inclination of a movable object (10), in particular a motor vehicle. A bubble level (11) is fixed on the object (10). The bubble level (11) comprises a housing (12), a liquid (16) c... | 10/04/1994 |
| 4797661 | Motion sensing device This invention relates to a device adapted to sensing motion when powered by passage of an electric current between two electrodes that is comprised of a container partially filled with an electrically conductive liquid along with two electrodes in contac... | 01/10/1989 |
| 3969944 | Sensor for accelerometers An accelerometer sensor comprising two vertically disposed tubular passages communicating at their bottom; the passages and the connection therebetween being partially filled with a conductive liquid; an electrical resistor in each passage; a conductor co... | 07/20/1976 |
