Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5421203 | Modifiable electrodynamic ultrasonic transducer | Alfred Graff, Gert Fischer | 1995-06-06 |
| 5164921 | Electrodynamic permanent magnet transducer | Alfred Graff | 1992-11-17 |