Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4992404 | Carbon-based catalyst useful in gas-solid reactions | Siegfried Gruhl, Siegbert Humberger, Goetz-Gerald Borger | 1991-02-12 |
| 4941748 | Extruder with ceramic processing unit | Martin Ullrich | 1990-07-17 |