Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5314171 | Apparatus for the extraction of metals from metal-containing raw materials | Hans A. Friedrichs | 1994-05-24 |
| 5261943 | Method and apparatus for the extraction of metals from metal-containing raw materials | Hans A. Friedrichs | 1993-11-16 |