Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5704561 | Wear-resistant hard-surfacing for the rolls of high-pressure roll presses for size reduction of granular material | Jakob Ansen, Frank Fischer-Helwig, Ludger Alsmann | 1998-01-06 |
| 5601520 | Wear-resistant hard-surfacing for the rolls of high-pressure roll presses | Ludger Alsmann, Frank Fischer-Helwig | 1997-02-11 |