Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6332949 | Method for upgrading used sulfuric acids | Jurgen Munnig, Wolfgang Lorenz, Karl-Heinz Schumacher | 2001-12-25 |
| 6242649 | Continuous method for producing aromatic amines | Reinhard Langer | 2001-06-05 |
| 6156288 | Process for purifying and concentrating spent sulfuric acids | Jurgen Munnig, Dieter Grenner | 2000-12-05 |
| 5779995 | Sludge phase reactor and process for performing sludge phase reactions | Harro Witt, Uwe J. Zarnack | 1998-07-14 |
| 5728880 | Process for the separation of high-boiling materials from the reaction mixture generated during the production of diaminotoluene | Harro Witt, Uwe J. Zarnack, Gerd Greger | 1998-03-17 |
| 5001286 | Process for separating sulphuric acid and nitric acid from dinitrotoluene mixtures obtained during the nitration of toluene | Harro Witt | 1991-03-19 |
| 4857281 | Pauling boiler and process for the concentration of sulphuric acid | Harro Witt, Peter Klein | 1989-08-15 |
| 4720326 | Process for working-up aqueous amine solutions | Harro Witt, Dieter Becher, Hermann Dallmeyer, Uwe J. Zarnack | 1988-01-19 |