Issued Patents All Time
Showing 1–16 of 16 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6180817 | Process for the distillation of crude ester in the DMT/PTA process | Udo Lenz, Ulrich Neutzler, Reinhard Sigg | 2001-01-30 |
| 6096171 | Process for the distillation of crude ester in the DMT/PTA process | Udo Lenz, Ulrich Neutzler, Reinhard Sigg | 2000-08-01 |
| 5891410 | Process for the purification of an oxidation off gas | Rudolf Modic, Hermann-Josef Korte, Johann H. Schroeder, Jorg Porschen | 1999-04-06 |
| 5869736 | Oxidation in the Witten-Hercules process for preparing dimethyl terephthalate | Stefan Jelko, Hermann-Josef Korte, Gerhard Franz, Hans-Guenther Srebny, Thomas Jostmann +1 more | 1999-02-09 |
| 5852201 | Process for the distillation of crude ester in the DMT/PTA process | Udo Lenz, Ulrich Neutzler, Reinhard Sigg | 1998-12-22 |
| 5679848 | Process for the preparation of terephthalic acid and its isomers | Hermann-Josef Korte, Christoph Schwarz, Thomas Jostmann | 1997-10-21 |
| 5614159 | Process for the purification of an oxidation off gas with energy recovery | Rudolf Modic, Hermann-Josef Korte, Johann H. Schroeder, J org Porschen | 1997-03-25 |
| 5338882 | Process for the production of DMT-intermediate product of specific purity and pure terephthalic acid | Hermann-Josef Korte, Anton Miletic, Hans U. Neutzler, Johann H. Schroeder, Ralf Wirges | 1994-08-16 |
| 5286896 | Process for the production of DMT-intermediate product of specific purity | Hermann-Josef Korte, Anton Miletic, Hans U. Neutzler, Johann H. Schroeder, Ralf Wirges | 1994-02-15 |
| 4755295 | Multistage arrangement for countercurrent separation and methods of operating same | Friedrich Donhauser, Johann H. Shroeder, Jorg Porschen | 1988-07-05 |
| 4707274 | Multistage arrangement for countercurrent separation and methods of operating same | Friedrich Donhauser, Johann H. Schroeder, Jorg Porschen | 1987-11-17 |
| 4642377 | Process for producing terephthalic acid from p-xylene and methanol by way of dimethyl terephthalate | Rudolf Modic, Jorg Porschen, Ralf Wirges | 1987-02-10 |
| 4642369 | Process for the production of dimethyl terephthalate from p-xylene and methanol | Rudolf Modic, Jorg Porschen, Ralf Wirges | 1987-02-10 |
| 4578501 | Preparation of terephthalic acid from a crude dimethyl terephthalate | Georg Schreiber, Heinz Schroeder | 1986-03-25 |
| 4302595 | Process for the preparation of terephthalic acid by the hydrolysis of intermediate stage crude dimethyl terephthalate | Georg Schreiber, Heinz Schroeder | 1981-11-24 |
| 4269805 | Reactor for the oxidation of alkyl aromatics with oxygen-containing gases in the liquid phase | Heinrich J. Schroeder | 1981-05-26 |