Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4225490 | Heterocyclyl-azo-phenyl dyes having a cationic group linked through a branched alkylene chain to the nitrogen atom of the coupling component radical | Beat Henzi | 1980-09-30 |
| 4213898 | Cationic 5-arylazo-6-hydroxypyridone-2 dyes | Curt Mueller, Willy Steinemann | 1980-07-22 |