Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4670115 | Electrolytic silver refining process and apparatus | Adalbert Prior, Rolf Marr | 1987-06-02 |
| 4503015 | Method of removing arsenic from a copper electrolyte | Rolf Marr, Reinhard Wachter | 1985-03-05 |