Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4420117 | Waste paper disintegrating, sorting and fiber recovery apparatus | Helmut Thumm, Theodor Bahr, Walter Stricker | 1983-12-13 |
| 4333836 | Cellular drum filter for the dewatering of fiber suspensions | Helmut Hirschfelder | 1982-06-08 |