Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5380018 | Piston ring having a non-uniform radial pressure distribution | Heinrich-Christian Mader, Wolfgang Schmelter | 1995-01-10 |
| 4973066 | Piston ring | Gerhard Duck, Hans-Rainer Brillert, Wolfgang Schmelter | 1990-11-27 |
| 4957212 | Non-circular piston rings | Gerhard Duck, Hans-Rainer Brillert | 1990-09-18 |