Douglas L. Hoffman

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Spokane, WA, US

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Patents Grantslast 30 patents

Information Patent Grant
Concave-convex faceting method and apparatus
- Patent number 5,044,123
- Issue date Sep 3, 1991
- Douglas Hoffman
- B24 - GRINDING POLISHING
Information Patent Grant
Collet chuck aligning assembly for gem faceting machines
- Patent number 4,265,057
- Issue date May 5, 1981
- Douglas L. Hoffman
- B24 - GRINDING POLISHING
Information Patent Grant
Milling wheels for small flour mills
- Patent number 4,082,234
- Issue date Apr 4, 1978
- Douglas Hoffman
- B02 - CRUSHING, PULVERISING, OR DISINTEGRATING PREPARATORY TREATMENT OF GRAIN...
Information Patent Grant
Grinding mill
- Patent number 4,039,153
- Issue date Aug 2, 1977
- Douglas L. Hoffman
- B02 - CRUSHING, PULVERISING, OR DISINTEGRATING PREPARATORY TREATMENT OF GRAIN...
Information Patent Grant
Gem faceting machine having an adjustable faceting head support ass...
- Patent number 3,992,821
- Issue date Nov 23, 1976
- Douglas L. Hoffman
- B24 - GRINDING POLISHING