Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888516 | Piezoelectrically excitable resonance system | Johannes Daeges | 1989-12-19 |
| 4877989 | Ultrasonic pocket atomizer | Wolf-Dietrich Drews, Martin Ruttel, Jurgen Friedrich | 1989-10-31 |