Issued Patents All Time
Showing 26–42 of 42 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4394875 | Actuator for a mine roof support unit | Werner Grommas | 1983-07-26 |
| 4391553 | Hydraulic control systems for and methods of controlling the operation of tunnelling apparatus | Herbert Heitkamp | 1983-07-05 |
| 4391181 | Hydraulic control systems for mining apparatus | Michael Dettmers, Kunibert Becker, Harry Rosenberg | 1983-07-05 |
| 4378124 | Hydraulic coupling device | Bernd Peters | 1983-03-29 |
| 4378027 | Control unit for an electro-hydraulic roof support control arrangement | Harry Rosenberg | 1983-03-29 |
| 4327628 | Hydraulic roof support control system | Michael Dettmers | 1982-05-04 |
| 4325659 | Mineral mining installation | Lubomir Plevak | 1982-04-20 |
| 4319772 | Hydraulic coupling device | Gunter Hennlich | 1982-03-16 |
| 4313463 | Pressure-relief valve device | — | 1982-02-02 |
| 4310027 | Hydraulic control devices for use with mining apparatus | — | 1982-01-12 |
| 4307981 | Mineral mining installation | Harry Rosenberg, Kunibert Becker | 1981-12-29 |
| 4306822 | Hydraulic control means | Harry Rosenberg | 1981-12-22 |
| 4302034 | Hydraulic coupling device | Gunther Hennlich | 1981-11-24 |
| 4284101 | Pressure-relief valve devices | — | 1981-08-18 |
| 4247226 | Hydraulic conduit systems for mine installations | Michael Dettmers | 1981-01-27 |
| 4247135 | Hydraulic coupling device | Bernd Peters | 1981-01-27 |
| 4191498 | Hydraulic roof support control system | Harry Rosenberg | 1980-03-04 |