Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6485675 | Bottom for a metallurgical vessel with a direct current electric arc device | Konrad Friebe | 2002-11-26 |
| 6347110 | Charging device for low blast furnaces | Bertram Rupietta | 2002-02-12 |
| 5835523 | Bottom electrode for a metallurgical vessel | Gerhard Schaefers, Ewald Feuerstacke, Werner Hofmann | 1998-11-10 |
| 5471496 | Electrode support device for arc furnaces | Andreas Schüring | 1995-11-28 |