Issued Patents All Time
Showing 1–25 of 42 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5157947 | Balanced hydraulic valve devices | Reiner Stich, Michael Dettmers | 1992-10-27 |
| 5060556 | Arrangement for emergency operation of hydraulic appliance in an electro-hydraulically controlled mineral mining installation | Michael Dettmers, Uwe Trox | 1991-10-29 |
| 4790347 | Pressure-relief valve devices | Werner Grommas | 1988-12-13 |
| 4781734 | Non-porous hydrogen diffusion membrane and utilization thereof | Friedrich Behr, Bernd Kugler, Michael Pietsch | 1988-11-01 |
| 4755084 | Multi-part roof-contacting structures of mine roof supports | Bernd Peters, Harry Rosenberg | 1988-07-05 |
| 4737052 | Distributor | Bernd Peters | 1988-04-12 |
| 4718458 | Distributors for pressure fluid control system in mineral mining installations | Bernd Peters | 1988-01-12 |
| 4716928 | Pressure-relief valve devices | Willy Kussel | 1988-01-05 |
| 4713234 | Process and apparatus for conversion of water vapor with coal or hydrocarbon into a product gas | Heiko Barnert, Michael Oertel, Rudolf Schulten | 1987-12-15 |
| 4702148 | Control of the actuation of hydraulic consumers | Willy Kussel, Michael Dettmers | 1987-10-27 |
| 4613257 | Hydraulic control arrangement | Michael Dettmers | 1986-09-23 |
| 4572709 | Control apparatus | Michael Dettmers | 1986-02-25 |
| 4552487 | Mine roof support unit having dust suppression means | — | 1985-11-12 |
| 4544185 | Hydraulic coupling device | Bernd Peters | 1985-10-01 |
| 4537221 | Hydraulic control devices for use with mining apparatus | Michael Dettmers | 1985-08-27 |
| 4536017 | Connecting devices for use with pneumatic or hydraulic hoses | Bernd Peters | 1985-08-20 |
| 4534681 | Mine roof supports | Michael Dettmers | 1985-08-13 |
| 4534584 | Hydraulic connecting device | Jurgen Melis, Peter Wollenhaupt | 1985-08-13 |
| 4496373 | Diffusion membrane and process for separating hydrogen from gas mixture | Friedrich Behr, Rudolf Schulten | 1985-01-29 |
| 4493340 | Hydraulic coupling | — | 1985-01-15 |
| 4451181 | Control systems for mineral mining installations | Thomas Trumper, Harry Rosenberg | 1984-05-29 |
| 4443135 | Control apparatus | Klaus Beckmann, Hans-Theodor Grisebach | 1984-04-17 |
| 4440522 | Hydraulic control arrangement for a roof support unit of a mineral mining installation | Michael Dettmers | 1984-04-03 |
| 4427321 | Mineral mining installation | Harry Rosenberg, Kunibert Becker | 1984-01-24 |
| 4422807 | Mine roof supports | Michael Dettmers, Bernd Peters | 1983-12-27 |