Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6964559 | Two shaft vacuum pump with cantilevered rotors | Manfred Behling, Thomas Dreifert, Hartmut Kriehn, Klaus Rofall | 2005-11-15 |
| 6863511 | Two-shaft vacuum pump | Hartmut Kriehn, Manfred Behling, Thomas Dreifert, Klaus Rofall, Heinrich Engländer +1 more | 2005-03-08 |
| 6758660 | Screw vacuum pump with a coolant circuit | Hartmut Kriehn | 2004-07-06 |
| 5660535 | Method of operating a claw-type vacuum pump and a claw-type vacuum pump suitable for carrying out the method | Andreas Kobus, Uwe Gottschlich, Hartmut Kriehn | 1997-08-26 |
| 5399817 | Muffler | Hanns-Peter Berges, Hartmut Kriehn, Sascha Bauer | 1995-03-21 |
| 5364245 | Dry-running twin-shaft vacuum pump | Hartmut Kriehn | 1994-11-15 |
| 5356275 | Device for supplying a multi-stage dry-running vacuum pump with inert gas | Rudolf Bahnen | 1994-10-18 |
| 5131825 | Multi-stage vacuum pump with reaction chamber between stages | Paul Bachmann, Hartmut Kriehn, Monika Kuhn | 1992-07-21 |