Engel; L. David
Patent Applications and Registrations
Patent applications and USPTO patent grants for Engel; L. David.The latest application filed is for "brush element for an acoustic toothbrush".
- Engel; L. David - La Jolla CA
- Engel; L. David - King County WA
| Patent | Date |
|---|---|
| Brush element for an acoustic toothbrush Grant 5,305,492 - Giuliani , et al. April 26, 1 | 1994-04-26 |
| Dental hygiene device Grant 4,787,847 - Martin , et al. November 29, 1 | 1988-11-29 |
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