Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6186512 | Piston ring | Peter Wolki, Robert Wieser | 2001-02-13 |
| 6105739 | Guide bushing | — | 2000-08-22 |
| 6003227 | Process for manufacturing a piston ring | Gerald Fenn, Hasan Asadi | 1999-12-21 |
| 5655634 | Shock absorbers and vibration dampers; and shock absorbers and vibration dampers with a piston with a piston ring; and a cyclinder with a piston with a piston ring | Manfred Grundei, Peter Wolki, Robert Wieser | 1997-08-12 |
| 4987826 | Cylinder piston rod unit | Helmut Umlauf | 1991-01-29 |