Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868876 | Electrostatic discharge protection device | Kurt Schiller, Johann Luger, Heinrich Kallhardt | 1989-09-19 |
| 4860368 | Acoustic transducers with improved frequency response | Ernst Payer | 1989-08-22 |