Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4634060 | Processing and sorting of refuse | Hanns-Helmut Riemann, Hans Sonnenschein | 1987-01-06 |
| 4509697 | Rotary drum screen for waste material and its method of operation | Hanns-Helmut Riemann, Hans Sonnenschein | 1985-04-09 |