Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4741867 | Process for the preparation of 1-amino-2-bromo-4-hydroxyanthraquinone | Helmut Dittmer, Jürgen Schneider, Claus Krugermann | 1988-05-03 |
| 4246180 | Process for separating off 1-amino-4-bromoanthraquinone-2-sulphonic acid | Heinrich Leister, Helmut Dittmer | 1981-01-20 |
| 4213910 | Process for the preparation of 1-amino-4-bromoanthraquinone-2-sulphonic acid I | Rolf Muders, Heinrich Leister, Helmut Dittmer | 1980-07-22 |