Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5660535 | Method of operating a claw-type vacuum pump and a claw-type vacuum pump suitable for carrying out the method | Andreas Kobus, Lothar Brenner, Hartmut Kriehn | 1997-08-26 |