Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4790347 | Pressure-relief valve devices | Walter Weirich | 1988-12-13 |
| 4394875 | Actuator for a mine roof support unit | Walter Weirich | 1983-07-26 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4790347 | Pressure-relief valve devices | Walter Weirich | 1988-12-13 |
| 4394875 | Actuator for a mine roof support unit | Walter Weirich | 1983-07-26 |