Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4626654 | Metallurgical plasma melting process | Fred Esser, Detlev Klopper, Gerhard Scharf | 1986-12-02 |
| 4434494 | Contact electrode for melting and heating furnaces with DC plasma heating | Herbert Pietzsch, Karlheinz Hofmann, Erich P/o/ tzsch, Fred Esser | 1984-02-28 |
| 4418414 | Metallurgical plasma melting furnace | Fred Esser, Detlev Klopper, Albrecht Kruger | 1983-11-29 |
| 4390773 | Contact electrode for melting and heating furnaces with DC plasma heating | Fred Esser, Detlev Klopper, Gerhard Scharf | 1983-06-28 |