Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5779995 | Sludge phase reactor and process for performing sludge phase reactions | Harro Witt, Heiko Beckhaus | 1998-07-14 |
| 5728880 | Process for the separation of high-boiling materials from the reaction mixture generated during the production of diaminotoluene | Heiko Beckhaus, Harro Witt, Gerd Greger | 1998-03-17 |
| 5563296 | Continuous process for preparing aromatic amines | Fritz Pohl, Dieter Grenner, Hartmut Hetzel, Helmut Judat | 1996-10-08 |
| 5345012 | Process for the preparation of dinitrotoluene | Thomas Schieb, Gerhard Wiechers, Rudolf Sundermann | 1994-09-06 |
| 5314588 | Process for recovering polysocyanates from the distillation residues obtained in the production of tolylene diisocyanate | Volker Weintritt, Christian König | 1994-05-24 |
| 4915509 | Mixer for mixing at least two free-flowing substances, especially those which react during mixing | Heinz Sauer, Hermann Dallmeyer, Berthold Keggenhoff, Bernd Weber | 1990-04-10 |
| 4851571 | Process for the production of isocyanates | Heinz Sauer, Hermann Dallmeyer, Berthold Keggenhoff, Bernd Weber | 1989-07-25 |
| 4720326 | Process for working-up aqueous amine solutions | Heiko Beckhaus, Harro Witt, Dieter Becher, Hermann Dallmeyer | 1988-01-19 |