Issued Patents All Time
Showing 1–25 of 40 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4923691 | Aluminum nitride powder and a process for the preparation thereof | Dieter Peters, Christian May | 1990-05-08 |
| 4906445 | Continuous process for complete removal or organic impurities from and complete decolorization of prepurified wet-process phosphoric acid | Gunther Schimmel, Gerhard Bettermann, Friedrich Kolkmann | 1990-03-06 |
| 4705529 | Process for reducing the reactivity and improving the flow behavior of phosphorus pentoxide | Gunther Schimmel, Werner Kowalski, Reinhard Gradl | 1987-11-10 |
| 4678650 | Process for making an alkali phosphate solution | Reinhard Gradl | 1987-07-07 |
| 4668492 | Process for dearsenifying phosphoric acid solutions | G/u/ nther Schimmel, Reinhard Gradl | 1987-05-26 |
| 4639331 | Process for making pulverulent ammonium polyphosphates stable to hydrolysis | Georg Elsner, Horst Staendeke | 1987-01-27 |
| 4620966 | Process for defluorinating alkali metal phosphate solutions | Gunther Schimmel, Herbert Ressel, Reinhard Gradl | 1986-11-04 |
| 4601887 | Apparatus for improving the degree of graphitization of carbon black, and its use | Friedrich-Wilhelm Dorn, Manfred Wolter | 1986-07-22 |
| 4600565 | Process for making manganese (II) salt solutions containing ammonium salt | Klaus Lehr, Bernhard Hofmann | 1986-07-15 |
| 4596703 | Process for purifying wet-processed phosphoric acid | Reinhard Gradi, Gunther Schimmel | 1986-06-24 |
| 4540558 | Process for removing organic contaminants from wet-processed phosphoric acid | Reinhard Gradl, Hans-Werner Stephan, Gunther Schimmel | 1985-09-10 |
| 4539192 | Process for removing fluorine and organic compounds from prepurified wet processed phosphoric acid | Gunther Schimmel, Reinhard Gradl | 1985-09-03 |
| 4530769 | Process for separating carbon black from an aqueous suspension | Manfred Wolter, Friedrich-Wilhelm Dorn, Hans-Werner Stephan | 1985-07-23 |
| 4525333 | Process for separating gallium and indium from aqueous solutions | Gunther Schimmel, Werner Krause, Werner Pieper | 1985-06-25 |
| 4517163 | Process for making titanium dioxide concentrates | Klaus Jodden, Hans-Werner Stephan | 1985-05-14 |
| 4482527 | Process for removing nitrogen dioxide from off-gas | Klaus Lehr | 1984-11-13 |
| 4466948 | Process for removing heavy metal ions and arsenic from wet-processed phosphoric acid | Gunther Schimmel, Reinhard Gradl | 1984-08-21 |
| 4460549 | Recovery of uranium from wet-process phosphoric acid | Gunther Schimmel, Reinhard Gradl | 1984-07-17 |
| 4457848 | Process for after-treating extraction residues originating from the decontamination of phosphoric acid | Gunther Schimmel, Reinhard Gradl | 1984-07-03 |
| 4452768 | Process for removing heavy metal ions from wet-processed phosphoric acid | Reinhard Gradl, Gunther Schimmel, Werner Krause | 1984-06-05 |
| 4418043 | Process for separating metals from aqueous solutions | Klaus Lehr | 1983-11-29 |
| 4399114 | Process for the dearsenification of polyphosphoric acid | Alexander Maurer, Markus Erpenbach | 1983-08-16 |
| 4396586 | Process for making long-chain ammonium polyphosphate | Alexander Maurer, Jurgen Stenzel | 1983-08-02 |
| 4394358 | Production of granular alkali metal diphosphates or triphosphates | Alexander Maurer, Renate Adrian, Herbert Panter, Dieter Nolker | 1983-07-19 |
| 4392962 | Process for separating metals from aqueous solutions | Klaus Lehr, Christian May, Hermann Klein | 1983-07-12 |