Orvin D. Simpson — 1 Patent at Unknown

Orvin D. Simpson has been granted 1 US patent while listed as an inventor at Unknown. All of these patents were granted in 1983. Orvin D. Simpson ranks #2,406,284 of 4,157,543 US inventors in our database (top 57.9%). Patent records list Orvin D. Simpson in Springfield, MO, US.

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Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date
4401941	Flange and casing checking instrument	William E. Cunningham	1983-08-30

Orvin D. Simpson — 1 Patent

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