Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5213717 | Apparatus for fumigating waste waters | Wilhelm P. Doppelfeld, Werner Pieper, Wilhelm Giechau | 1993-05-25 |
| 4556548 | Process for purifying wet-processed phosphoric acid | Reinhard Gradl | 1985-12-03 |
| 4354983 | Process for the purification of O,O-dialkylthionophosphoric acid chlorides | Heinz Harnisch | 1982-10-19 |