Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12049836 | Valve stem seal comprising a valve rotating device | Frank Zwein, Florian Ringeling, Thorsten Matthias, Stefan Kellermann | 2024-07-30 |
| 11898473 | Method and device for manufacturing hollow, internally cooled valves | Thorsten Matthias | 2024-02-13 |
| 11441454 | Valve for internal combustion engines having a guide vane for coolant | Stefan Kellermann, GUIDO BAYARD | 2022-09-13 |