Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5131825 | Multi-stage vacuum pump with reaction chamber between stages | Lothar Brenner, Hartmut Kriehn, Monika Kuhn | 1992-07-21 |
| 4886599 | Filter cartridge with series elements for chemical and mechanical filtration | Hanns-Peter Berges, Wolfgang Leier | 1989-12-12 |
| 4756825 | Apparatus for purifying hydrogen-free fluorinated lubricants | Hanns-Peter Berges, Dieter Gotz | 1988-07-12 |
| 4612957 | Vacuum pump and trap combination | Lutz Arndt, Hanns-Peter Berges, Wolfgang Leier, Dieter Vorberg | 1986-09-23 |