Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4464479 | Method for treating red mud | Gunter Ritter, Uwe Lenz | 1984-08-07 |
| 4447319 | Process for separating sand from a brown coal or lignite material containing sand | — | 1984-05-08 |