Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4906445 | Continuous process for complete removal or organic impurities from and complete decolorization of prepurified wet-process phosphoric acid | Gunther Schimmel, Gerhard Bettermann, Gero Heymer | 1990-03-06 |
| 4904459 | Process for working up dusts which are produced in the electrothermal production of phosphorus | Gunther Schimmel, Johannes Scheffer | 1990-02-27 |
| 4889702 | Process for removing metallic constituents from dust obtained during the electrothermal production of yellow phosphorus | Klaus Jodden | 1989-12-26 |
| 4780294 | Process for making crude phosphoric acid | Gunther Schimmel, Reinhard Gradl, Herbert Ressel | 1988-10-25 |
| 4762693 | Process for working up heavy metal-containing residues originally from the decontamination of crude phosphoric acid | Gunther Schimmel, Reinhard Gradl | 1988-08-09 |
| 4683127 | Process for making wet-process phosphoric acid | Herbert Ressel, Reinhard Gradl, Gunther Schimmel | 1987-07-28 |