Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5975857 | Process for operating a dry-compression vacuum pump as well as a suitable vacuum pump for implementation of this process | Hartmut Kriehn, Rudolf Bahnen | 1999-11-02 |
| 5718565 | Apparatus and process for operating a dry-compression vacuum pump | Hartmut Kriehn, Rudolf Bahnen | 1998-02-17 |
| 5131825 | Multi-stage vacuum pump with reaction chamber between stages | Paul Bachmann, Lothar Brenner, Hartmut Kriehn | 1992-07-21 |