Examining patents can be a lot of fun. Whether on this topic or nearly any other. Ever wonder what makes something special when you see a patent number on a product? Here's how to view the patent and see for yourself. Since patents reference the patents of prior art is can quickly become a history lesson.
From here I'll leave it up to you to create advanced searches and to follow cited patents. Do remember that patents from 1790 through 1975 are searchable only by Patent Number and Current US Classification!
The following U.S. patents are cited on this page:
- 3,678,770, "Single Lever Control" (1st generation UniTrol)
- 3,736,674, "Impeller" (1st generation UniTrol)
- 3,720,112A, "Load Limiter for Self-Energizing Drive" (Single Speed UniTrol)
- 3,774,322 , "Snow Handling Implement With Belt-Driven Impeller and Coacting Labyrinthian Baffle" (Single Speed UniTrol)
- 3,813,954, "Friction Drive with Axially Spaced Disks and Intermediate Shiftable Wheel (Single Speed UniTrol) Also Canadian patent #937,778.
- 4,011,913, "Foldable Handle" (Originally for compact tillers, used on Vertical shaft engine single stage snow throwers)
- D269,092, "Snow thrower" (ornamental design of the Snow Cannon)
- 4,016,770, "Pulley Assembly" (Vertical shaft engine single stage)
- 4,123,857, "Drive arrangement for snowblower" (Vertical shaft engine single stage)
- 4,203,237, "Snowblower" (Snow Cannon)
- 4,068,397, "Snowblower Discharge Guide and Control Arangement Therefor" (Vertical shaft engine single stage)
- 4,457,086, "Snowblower having improved auger and traction drive control " (2nd Generation UniTrol)
If you want to do some research and follow names and terms here are some guidelines.
- Go to the U.S. Patent Office site use the link for a patent search.
- To follow one of the patents numbers cited on this page:
- Select "Patents"
- Select "PatFT
- Enter the patent number as "Term 1"
- Across to the right you can leave it on all fields or select "Patent Number" from the pull down.
- Under "Select Years" chose 1790 to present from the pulldown
- Click on "Search"
If you would rather not deal with the patent office's kludgy interface you can also search for patents as well as call them up from number using the patent feature Google provides.
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