Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4925382 | Roller press for compacting fine-grained salts into sheets | Hans-Georg Bergendahl, Kurt Zech | 1990-05-15 |
| 4703897 | Method and apparatus for continuous pressure comminution of brittle grinding stock | Klaus Beisner, Ludwig Gemmer, Hans Kellerwessel | 1987-11-03 |
| 4592512 | Method and apparatus for the common grinding of two or more brittle materials having different grinding properties | Wolfgang Grigel, Hans Kellerwessel | 1986-06-03 |