Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4626654 | Metallurgical plasma melting process | Fred Esser, Walter Lachner, Gerhard Scharf | 1986-12-02 |
| 4418414 | Metallurgical plasma melting furnace | Fred Esser, Walter Lachner, Albrecht Kruger | 1983-11-29 |
| 4390773 | Contact electrode for melting and heating furnaces with DC plasma heating | Fred Esser, Walter Lachner, Gerhard Scharf | 1983-06-28 |