Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4806324 | Process for making phosphoric acid free from titanium | Gunther Schimmel, Reinhard Gradl | 1989-02-21 |
| 4777028 | Process for freeing mineral acids from heavy metals | — | 1988-10-11 |
| 4511546 | Linear, substantially water-insoluble ammonium polyphosphates and process for making them | Alexander Maurer | 1985-04-16 |
| 4394360 | Process for reducing iron in phosphoric acid solution | Klaus Lehr | 1983-07-19 |
| 4346066 | Purification of wet-process phosphoric acid | Reinhard Gradl, Klaus-Peter Ehlers, Wolfgang Scheibitz | 1982-08-24 |
| 4321245 | Process for the purification of wet-processed phosphoric acid | Reinhard Gradl, Klaus-Peter Ehlers | 1982-03-23 |
| 4313826 | Liquid-liquid extraction apparatus | Reinhard Gradl, Klaus-Peter Ehlers | 1982-02-02 |
| 4299803 | Production of alkali metal phosphate solutions free from zinc | Klaus-Peter Ehlers, Roelof Mulder | 1981-11-10 |
| 4279876 | Conversion of extraction residues originating from phosphoric acid decontamination to solid deposition products | Reinhard Gradl, Klaus-Peter Ehlers, Wolfgang Scheibitz | 1981-07-21 |
| 4279878 | Process for freeing phosphoric acid from organic contaminants | Alexander Maurer, Gero Heymer | 1981-07-21 |
| 4271128 | Apparatus for recovering alcoholic phosphoric acid solutions from acid phosphates | Wolfgang Scheibitz, Klaus-Peter Ehlers | 1981-06-02 |
| 4222994 | Solvent extraction purification of wet-processed phosphoric acid | Klaus-Peter Ehlers, Wolfgang Scheibitz, Gero Heymer | 1980-09-16 |
| 4203956 | Process and apparatus for recovering alcoholic phosphoric acid solutions from acid phosphates | Wolfgang Scheibitz, Klaus-Peter Ehlers | 1980-05-20 |
| 4200620 | Decontamination of wet-processed phosphoric acid | Klaus-Peter Ehlers, Wolfgang Scheibitz, Gero Heymer | 1980-04-29 |