Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4246180 | Process for separating off 1-amino-4-bromoanthraquinone-2-sulphonic acid | Helmut Dittmer, Hubert Schonhagen | 1981-01-20 |
| 4213910 | Process for the preparation of 1-amino-4-bromoanthraquinone-2-sulphonic acid I | Rolf Muders, Helmut Dittmer, Hubert Schonhagen | 1980-07-22 |