Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4848844 | Overburden excavator | — | 1989-07-18 |
| 4624504 | Method of excavating overburden in surface mining operations | Rudiger Franke, Hans Goergen, Christian Niemann-Delius, Frank Kay | 1986-11-25 |
| 4489818 | Cross-pit conveyor | Rudiger Franke | 1984-12-25 |
| 4303140 | Transport apparatus for heavy open-cast working equipment | Rudiger Franke, Rudolf Fauerbach, Michael Wenzel | 1981-12-01 |