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 |
| 4767228 | Ribbon cassettes A ribbon cassette, such as in inked ribbon for a printing machine, has a supply spool and a take-up spool. An unwinding force is applied to the ribbon and the take-up spool is driven from the supply spool through a slip coupling. The configuration of the ... | 08/30/1988 |
| 4746234 | Relating to postal franking machines Postal franking apparatus in which both semi-permanent and variable information to be printed onto an envelope is stored electrically in a memory and is read out to form printing control signals for controlling a thermal printer containing thermally activ... | 05/24/1988 |
| 4705417 | Postal franking machine A movement monitoring device for monitoring the movement of items past or through a work station wherein the items move synchronously with a ribbon through or past the work station. The transport of the items is monitored by a detector which monitors the ... | 11/10/1987 |
| 4678139 | Ribbon cassettes and apparatus for receiving same In a machine which uses cassettes, a compartment is provided for receiving the cassette. Examples of such machines are printing machines using an inked ribbon cassette. In the compartment there is a V-shaped toggle spring which is pivotally mounted at its... | 07/07/1987 |
| 4446022 | Vibratory screening apparatus for screening liquids A vibratory screening machine as described separating solid particles from liquid in which a fine mesh screen (30) includes an inclined region extending upwardly to a discharge edge (34) over which solid material (36) separated by filtration can pass. Vib... | 05/01/1984 |
