Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5453253 | Method of reprocessing jarosite-containing residues | Adolf Von Ropenack, Heiner GRIMM | 1995-09-26 |
| 4789446 | Method of processing residues from the hydrometallurgical production of zinc | Adolf Von Ropenack, Gunter Smykalla, Volker Wiegand | 1988-12-06 |