Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5660810 | Method and device for delivering hot, aggressive media | Helmut Waldmann, Helmut Harle, Franz-Rudolf Minz, Fritz Gestermann | 1997-08-26 |
| 5645614 | Process for the utilization of sewage sludges | Gunther Herbst, Manfred Erken, Franz-Josef Menge, Helmut Kreusing | 1997-07-08 |