Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5553998 | Gas friction vacuum pump having at least three differently configured pump stages releasably connected together | Martin Muhlhoff, Hans Kriechel, Frank Fleischmann | 1996-09-10 |
| 5165872 | Gas friction pump having a bell-shaped rotor | Frank Fleischmann, Hans Kriechel, Martin Muhlhoff | 1992-11-24 |
| 5114320 | Blower or pump with capillary filter for replenishment of oil separated by vacuum pump | Martin Muhlhoff, Hans Kriechel, Wolfgang Maas, Dieter Kolvenbach | 1992-05-19 |
| 5059092 | Vacuum pump having emergency bearings | Harald Lassig, Helmut Schneider | 1991-10-22 |
| 5051060 | Gas friction pump having an outlet-side helical stage | Frank Fleischmann, Hans Kriechel, Martin Muhlhoff | 1991-09-24 |
| 4983107 | Multistage rotary piston vacuum pump having sleeves to fix shaft positions | Ralf Steffens, Hanns-Peter Berges, Wolfgang Leier | 1991-01-08 |
| 4978276 | Pump stage for a high-vacuum pump | Winfried Kaiser, Hans-Guenter Stueber | 1990-12-18 |
| 4974318 | Method of making a dual-shaft machine | Josef Heppekausen, Karl-Heinz Ronthaler, Ralf Steffens | 1990-12-04 |
| 4963076 | Radial blower with resiliently mounted bearing holders | Frank Fleischmann, Winfried Kaiser | 1990-10-16 |
| 4915194 | Lubricating oil feed system | Heinrich Engländer, Frank Fleischmann, Winfried Kaiser, Friedrich Schmaus, Gunter Schutz +2 more | 1990-04-10 |
| 4797062 | Device for moving gas at subatmospheric pressure | Ludger A. Deters, Heinrich Engländer, Gunter Schutz | 1989-01-10 |
| 4639199 | Two-shaft vacuum pump with internal compression | Heinz Frings, Karl-Heinz Ronthaler | 1987-01-27 |
| 4632650 | Vacuum pump having an evacuated gear chamber | Peter Frieden, Karl-Heinz Ronthaler, Jorg Thielicke | 1986-12-30 |
| 4561837 | Method of producing a rotor for rotary slide-vane vacuum pumps, and a rotor produced by said method | Hanns-Peter Berges | 1985-12-31 |
| 4483667 | Vacuum pump and method of operating the same | Hanns-Peter Berges, Peter Frieden | 1984-11-20 |
| 4371323 | Spiral rotation displacement machine with parallel motion devices ensuring relative torsional rigidity | Berthold Fischer, Andreas Schmitz | 1983-02-01 |
| 4300875 | Positive displacement machine with elastic suspension | Berthold Fischer, Hansen Pfaff, Andreas Schmitz | 1981-11-17 |