Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4780294 | Process for making crude phosphoric acid | Gunther Schimmel, Friedrich Kolkmann, Reinhard Gradl | 1988-10-25 |
| 4705671 | Apparatus for reducing iron and vanadium in phosphoric acid solution | Wilhelm Westphal | 1987-11-10 |
| 4683127 | Process for making wet-process phosphoric acid | Friedrich Kolkmann, Reinhard Gradl, Gunther Schimmel | 1987-07-28 |
| 4642224 | Process for reducing iron and vanadium in phosphoric acid solution | Hans Haas, Johannes Krause | 1987-02-10 |
| 4620966 | Process for defluorinating alkali metal phosphate solutions | Gunther Schimmel, Gero Heymer, Reinhard Gradl | 1986-11-04 |