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 |
| 4990009 | Color converter for monochrome dot matrix printers A mechanism is disclosed for converting monochrome dot matrix printers to color printers by means of a ribbon shift mechanism on ribbon cartridges, the action of which is controlled by print head motion. The mechanism comprises a ribbon guide, which redir... | 02/05/1991 |
| 4341479 | Typewriter ribbon cartridge actuating device for portable typewriter A portable typewriter particularly adapted for juvenile use comprises a plurality of types, a plurality of key levers each of which has a key and arm, an universal plate actuated by any one of the poeration key levers, a carriage in which a platen is prov... | 07/27/1982 |
| 4280767 | Printing apparatus Printing apparatus, in particular for performing multi-color printing operations, has a ribbon shift mechanism for selectively interposing different transversely spaced portions of a print ribbon between a print head and platen. The print head is of the i... | 07/28/1981 |
| 3980171 | Ribbon cartridge A top loading ribbon cartridge having a threaded ribbon guide for directing ribbon in the cartridge out of and back into the cartridge which is mountable on one side of a machine printing point. The threaded ribbon guide is movable relative to the cartrid... | 09/14/1976 |
