Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4934665 | Apparatus for preparing binderfree hot briquettes for smelting purposes | Erich Hoffken, Rudolf Auth, Werner Kaas | 1990-06-19 |
| 4872906 | Process and plant for producing binder-free hot briquettes | Rudolf Auth, Heinz Maas | 1989-10-10 |
| 4853031 | Process for preparing binderfree hot briquettes for smelting purposes | Erich Hoffken, Rudolf Auth, Werner Kaas | 1989-08-01 |