Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5186920 | Recovering TiO.sub.2 concentrates from TiO.sub.2 -containing substances | Walter Koch, Ali-Naghi Beyzavi | 1993-02-16 |
| 4775107 | Method of processing small batteries | Walter Koch, Hartmut Pietsch | 1988-10-04 |