Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7232295 | Tempering method for a screw-type vacuum pump | Hartmut Kriehn, Klaus Rofall | 2007-06-19 |
| 7056108 | Cooled screw-type vacuum pump | Hartmut Kriehn, Klaus Rofall, Ralf Steffens | 2006-06-06 |
| 6964559 | Two shaft vacuum pump with cantilevered rotors | Lothar Brenner, Thomas Dreifert, Hartmut Kriehn, Klaus Rofall | 2005-11-15 |
| 6863511 | Two-shaft vacuum pump | Hartmut Kriehn, Lothar Brenner, Thomas Dreifert, Klaus Rofall, Heinrich Engländer +1 more | 2005-03-08 |