Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4781284 | Cleaning of a drum | Horst Birkheuer, Dieter Hinrichsen | 1988-11-01 |
| 4663868 | Scoop wheel having oscillating impact cutters | Karl-Erich Partz | 1987-05-12 |
| 4303140 | Transport apparatus for heavy open-cast working equipment | Rudiger Franke, Michael Wenzel, Aby Weiss | 1981-12-01 |