Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4997579 | Procedure for the draining of sludge | Norbert Gros, Werner Stahl | 1991-03-05 |
| 4618414 | Process for separating mineral ultra-fine grain from washings obtained in coal processing or from coal slurries | Hans-Georg Hartan, Dietrich Muller | 1986-10-21 |