Duvall; John F.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Duvall; John F..The latest application filed is for "modular cable protector having removable wheel chair ramps".
- Duvall; John F. - Highlands Ranch CO
- Duvall; John F. - Buffalo NY
| Patent | Date |
|---|---|
| Modular cable protector having removable wheel chair ramps Grant 6,481,036 - Duvall November 19, 2 | 2002-11-19 |
| Hand grip for a wheel chock Grant D448,338 - Duvall September 25, 2 | 2001-09-25 |
| Brake shoe and production method therefor Grant 6,109,399 - Crawford , et al. August 29, 2 | 2000-08-29 |
| Hydrocyclone construction Grant 4,793,925 - Duvall , et al. December 27, 1 | 1988-12-27 |
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