Helfrich; Hans
Patent Applications and Registrations
Patent applications and USPTO patent grants for Helfrich; Hans.The latest application filed is for "foot control mechanism for a dental apparatus".
- Helfrich; Hans - Mannheim DE
| Patent | Date |
|---|---|
| Foot control mechanism for a dental apparatus Grant 5,423,231 - Helfrich , et al. June 13, 1 | 1995-06-13 |
| Foot switch Grant D342,720 - Phleps , et al. December 28, 1 | 1993-12-28 |
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