Issued Patents 2004
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6726216 | Piston ring with oxide-nitride composite layer | Rudolf Widmann, Steffen Hoppe | 2004-04-27 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6726216 | Piston ring with oxide-nitride composite layer | Rudolf Widmann, Steffen Hoppe | 2004-04-27 |