Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5536842 | Purification of indigo | Udo Bergmann, Manfred Gang | 1996-07-16 |
| 5525743 | Preparation of anthraquinone imide compounds | Udo Bergmann, Helmut Hoch, Heike Kilburg, Matthias Niedenbrueck | 1996-06-11 |
| 5424453 | Purification of indigo | Udo Bergmann | 1995-06-13 |
| 5380871 | Preparation of halogenated indigo | Udo Bergmann, Lothar Haas | 1995-01-10 |
| 5354876 | Preparation and purification of 1-amino-2-phenoxy-4-hydroxyanthraquinone | — | 1994-10-11 |
| 5116997 | Purification of indigo | — | 1992-05-26 |
| 5116996 | Purification of indigo | Walter Bieg, Ernst Lang | 1992-05-26 |
| 5109137 | Purification of indigo | Manfred Gaeng, Lothar Haas, Guenter Engelhardt, Walter Bieg, Matthias Fankhaenel | 1992-04-28 |
| 5075458 | Purification of indigo | Manfred Gaeng, Lothar Haas, Guenter Engelhardt, Walter Bieg, Matthias Fankhaenel | 1991-12-24 |
| 4911888 | Use of salts of sulfonamidocarboxylic acids as corrosion inhibitors in aqueous systems | Rolf Fikentscher, Gerold Braun, Chung-Ji Ischang, Christos Vamvakaris | 1990-03-27 |