Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4468780 | Method of lining a steel-making furnace | Bernard Kauffeisen, Manfred Oberbach, Gerhard Zingel, Gunter Wieland | 1984-08-28 |
| 4212926 | Parts subject to wear which come into contact with metal melts | Gunter Gelsdorf, Hermann Leupold | 1980-07-15 |