Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4492653 | Water-soluble trisazo dyestuffs on the basis of a combination of naphthalene-, diphenylamine- and pyrazolone derivatives | Karl Sommer | 1985-01-08 |
| 4485042 | Dyestuff containing at least three azo bridges | Wolfgang Bauer, Joachim Ribka | 1984-11-27 |