Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4424152 | Metal complex dyestuffs, processes for their preparation and their use for dyeing nitrogen-containing materials | Winfried Mennicke | 1984-01-03 |
| 4256634 | Iron complex azo dyestuffs | Kurt Eitel | 1981-03-17 |
| 4182713 | Benzotriazoles useful as azo dyestuff intermediates | Erich Kramer | 1980-01-08 |