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 |
| 7597167 | Snowmobile A snowmobile includes a track belt and a drive sprocket that couple with each other to propel the snowmobile with reduced noise and wear. The track belt has a plurality of driven projections and a plurality of driven windows at regular intervals along the direction ... | 10/06/2009 |
| 7051829 | No-slip drive sprocket A drive sprocket for a snowmobile, a drive train using the sprocket, and a method of using the sprocket to drive a track for a snowmobile. The drive sprocket includes a round base, a plurality of convolute lugs on the base, and a plurality of involute lugs on both s... | 05/30/2006 |
| 6561297 | Snowmobile four-cycle engine arrangement A snowmobile four-cycle engine arrangement, includes: a four-cycle engine arranged in an engine compartment formed in the front body of a snowmobile with its crankshaft laid substantially parallel to the body width and having a cylinder case inclined forw... | 05/13/2003 |
| 6390219 | Rear suspension system for a snowmobile A snowmobile suspension that provides a substantially constant motion-ration (i.e. reduced falling rate) over the entire suspension stroke of the suspension system. The suspension system includes a suspension assembly that includes a lower arm assembly, a... | 05/21/2002 |
| 6382338 | Snow vehicle A motor driven or pedal powered snow vehicle designed to emulate the steering and balancing characteristics of motorcycles and bicycles. The snow vehicle includes a frame, a swing arm, a track carriage, an endless loop track, a snow compacting ramp, an el... | 05/07/2002 |
| 6302232 | Snow vehicle A motor driven or pedal powered snow vehicle designed to emulate the steering and balancing characteristics of motorcycles and bicycles. The snow vehicle includes a frame, a swing arm, a track carriage, an endless loop track, a snow compacting ramp, an el... | 10/16/2001 |
| 6112840 | Snow vehicle A motor driven or pedal powered snow vehicle designed to emulate the steering and balancing characteristics of motorcycles and bicycles. The snow vehicle includes a frame, a swing arm, a track carriage, an endless loop track, a snow compacting ramp, an el... | 09/05/2000 |
| 5398769 | Aerator An aerator includes a frame supported on a pair of forward wheels and a pair of rearward wheels. An aerator head is mounted on a pivot frame on the forward end of the aerator frame, the pivot frame mounted to move the aerator head from a disengaged positi... | 03/21/1995 |
| 4244436 | Vehicle with power driven ski A power driven ski vehicle of the ski bob kind is driven by a power ski having a pair of running surfaces on the undersides of the power ski for sliding engagement with the snow and for supporting a substantial portion of th weight of the vehicle and ride... | 01/13/1981 |
| 4129193 | Propulsion system for a snow going device A propulsion system for a snow going device having a tread circulateably supported around an elongated body with skirt means on each side and extending below the elongated body for protecting the tread and improving the traction.... | 12/12/1978 |
