Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4960461 | Method and installation for extracting gold from gold ore | Mohammed Esna-Ashari, Ludwig Gemmer, Gert-Helge Hamacher | 1990-10-02 |
| 4753660 | Method for the production of a coal suspension | Hans-H. Gildemeister, Jurek Golda, Peter Zahr, Gerhard Keichel | 1988-06-28 |
| 4703897 | Method and apparatus for continuous pressure comminution of brittle grinding stock | Klaus Beisner, Ludwig Gemmer, Raimund Zisselmar | 1987-11-03 |
| 4592512 | Method and apparatus for the common grinding of two or more brittle materials having different grinding properties | Wolfgang Grigel, Raimund Zisselmar | 1986-06-03 |
| 4242129 | Method of recovering metals | Ernst Kausel | 1980-12-30 |