Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4675025 | Aqueous coal dispersions | Knut Oppenlaender, Karl Stork, Erich Schwartz | 1987-06-23 |
| 4657560 | Aqueous coal dispersions | Knut Oppenlaender, Karl Stork, Erich Schwartz | 1987-04-14 |
| 4417976 | Dewatering of petroleum-containing sludges with recovery of the oil component | Bruno Sander, Kurt Scherling | 1983-11-29 |