Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4960461 | Method and installation for extracting gold from gold ore | Mohammed Esna-Ashari, Hans Kellerwessel, Gert-Helge Hamacher | 1990-10-02 |
| 4703897 | Method and apparatus for continuous pressure comminution of brittle grinding stock | Klaus Beisner, Raimund Zisselmar, Hans Kellerwessel | 1987-11-03 |