Issued Patents 2018
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10000840 | Piston ring for internal combustion engines | Manfred Fischer, Ralf Lammers, Steffen Hoppe | 2018-06-19 |
| 9915346 | Piston ring | Ralf Lammers, Manfred Fischer, Jörg Vetter | 2018-03-13 |