Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4563766 | Electric arc furnace for melting metal, especially steel | Lothar Harmsen, Wilhelm Lachenmayer, Jurgen Zieschang | 1986-01-07 |
| 4351055 | Water cooled wall element formed of tubes for melting furnaces | Lothar Harmsen, Jurgen Zieschang, Friedhelm Vennmann | 1982-09-21 |
| 4275258 | Water-cooled box designed as wall element for a melting furnace | Lothar Harmsen, Wilhelm Lachenmayer, Friedhelm Vennmann, Jurgen Zieschang | 1981-06-23 |