Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5047517 | Laked pyrazolone azo pigment, process for its preparation and its use | — | 1991-09-10 |
| 4293306 | Process for the dyeing and printing of hydrophobic synthetic organic fiber materials with water-insoluble azo dyestuffs | Ernst Hoyer, Willi Steckelberg, Rudolf Schickfluss | 1981-10-06 |
| 4241166 | Photopolymerizable composition comprising a monoazo dye as contrast colorant | Kurt Klupfel, Heide Sprengel, Hansjorg Vollmann | 1980-12-23 |