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 |
| 6998075 | Method for casting of concrete products A method and apparatus are disclosed for slip-form casting a concrete product, the product being made from at least two different grades of concrete so that the concrete mix grade can be changed in an uninterrupted fashion during casting at a desired point along the... | 02/14/2006 |
| 6969476 | Method for casting a concrete product A method is disclosed for casting a concrete product using two or more different grades of concrete mix, in which method predetermined amounts of different grades of concrete mix are delivered at appropriate instants into the feeder hopper of the slip-form casting m... | 11/29/2005 |
| 4650015 | Balance beam scale having digital display A beam scale includes a single weight mounted on a balance beam which is movable to selected positions to establish ranges of weights to be measured. The beam is supported by a flexible member to which a strain gage mechanism is secured to provide a verni... | 03/17/1987 |
| 4293049 | Metering and balancing device and filling machine including such a device Field of the invention: filling machine industry. Device consisting of a lever made up of two arms arranged on each side of a fixed pivoting axis. The end of the first arm supports the end of a rod, movable axially and vertically to rotate the arm and ending a... | 10/06/1981 |
| 4113040 | Null transducer for an analytical balance A null balance transducer which is useful in analytical balances. The transducer features a first and second band which support the balance beam of the scale, and which shoulder most of the weight. A third band is also connected to the balance beam, and i... | 09/12/1978 |
| 3997012 | Roller assembly A device for converting a constant rotational input into a rotational output which is proportional to a separate input signal characterized by first and second members each having a surface of revolution about an axis with the surface of at least one of t... | 12/14/1976 |
