Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5238252 | Shut-off fittings with a sealing device | Wilhelm Stewen, Klaus Stefaniak | 1993-08-24 |
| 4293247 | Seals for mine roof supports | Harry Rosenberg | 1981-10-06 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5238252 | Shut-off fittings with a sealing device | Wilhelm Stewen, Klaus Stefaniak | 1993-08-24 |
| 4293247 | Seals for mine roof supports | Harry Rosenberg | 1981-10-06 |