Issued Patents 1989
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880576 | Acid halides, a process for their preparation | Norbert Langenfeld, Wolfgang Heydkamp | 1989-11-14 |
| 4874892 | Process for the preparation of 6-hydroxynaphthalene-1-carboxylic from 1-aminomethylnaphthalene-6-sulphonic acid | Erich Hammerschmidt | 1989-10-17 |
| 4873026 | Process for the preparation of 1-aminonaphthalene-2,4,7-trisulphonic acid and 1-aminonaphthalene-7-sulphonic acid | Horst Behre, Gerhard Marzolph, Willi Streicher | 1989-10-10 |
| 4868347 | Process for obtaining substituted fluorobenzenes | Edwin Ritzer | 1989-09-19 |
| 4863642 | Process for preparing acid halides | Erich Wolters | 1989-09-05 |
| 4836959 | Process for the preparation of 1-aminonaphthalene-2,4,7-trisulphonic acid and 1-aminonaphthalene-7-sulphonic acid | Willi Streicher, Gerhard Marzolph, Horst Behre | 1989-06-06 |
| 4835243 | Thermotropic aromatic polymers with high elongation at break, processes for their preparation and their use for the production of moulded articles, filaments, fibres and films | Volker Eckhardt, Hans-Rudolf Dicke, Erich Hammerschmidt, Ludwig Bottenbruch, Frank Kleiner | 1989-05-30 |
| 4814483 | Process for the preparation of optionally substituted 2-benzyl-toluenes | Gunter Silber | 1989-03-21 |
| 4795596 | 1-Aminomethylnaphthalene-6-sulphonic acid, its preparation and its use | Erich Hammerschmidt | 1989-01-03 |