Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4669919 | Process for consolidation and sealing coal and/or rock, soil and brick formations in mining, tunnelling and construction | Karl-Heinz Hilterhaus | 1987-06-02 |
| 4461600 | Method of and device for solidifying rock in mine tunnels and the like | Gerd Drespa | 1984-07-24 |