Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5681221 | Torsional vibration damper | Jürgen Pfeiffer | 1997-10-28 |
| 5642875 | Coil spring with flattened convolutions | Robert Felger | 1997-07-01 |
| 5634851 | Apparatus for damping-torsional vibrations | Johann Jackel, Hartmut Mende | 1997-06-03 |