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 |
| 7278221 | Angle measurement tool An angle measurement tool having two legs held together by a removable adjustment member in which the legs are joined together about a common axis so that one of the legs rotates with respect to the other to form a desired angle the value of which is read using inde... | 10/09/2007 |
| 7047655 | Snap locking angle adjustable device, in particular a carpenter's square The invention is a snap locking angle adjustable device, particularly applicable to carpenter's squares. Carpenter's squares, being used in rough environment, must be simple to adjust while providing robust snap locking at high angle precision. Prior art attains thi... | 05/23/2006 |
| 5392525 | Drawing instrument A drawing instrument including two rulers each having a head portion, a circular protrusion formed on one of the head portions, and a circular recess formed in the other head portion for slidable engagement with the circular protrusion, the rulers are gui... | 02/28/1995 |
| 4481720 | Combined level and protractor with calibration features An elongated body is provided including opposite side portions removably secured together by transverse threaded fasteners. One set of corresponding ends of the side portions include relieved areas opening toward each other defining a cavity opening outwa... | 11/13/1984 |
| 4394801 | Multifunction, multipurpose construction tool A multifunction, multipurpose construction tool comprised generally of two operating arms pivotally connected via their terminal ends, preferably their rounded terminal ends, one to the other, an angle indicator being provided at the pivotal connection, o... | 07/26/1983 |
