Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5206481 | Plasma burner for transferred electric arc | Heinrich-Otto Rossner, Gebhard Tomalla, Herbert Klein | 1993-04-27 |
| 4582607 | Process for the biological treatment of waste water | Siegfried Kiese | 1986-04-15 |