Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4978747 | Colorants obtained by reacting a NH.sub.2 -containing dyestuff with a diisocyanate followed by reaction of this adduct with a diamine | Karl-Arnold Weber, Hermann Henk, Klaus Kunde, Klaus Wunderlich | 1990-12-18 |
| 4670548 | Sulfo-group-containing trisazo dyestuffs | Hermann Henk | 1987-06-02 |
| 4339380 | Azo dyestuffs | Herbert Hugl, Gerhard Wolfrum, Winfried Mennicke, Karl H. Schundehutte | 1982-07-13 |