Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5668260 | Tetrakisazo Compounds, the method of preparation thereof and the process of pyeing | Dieter Baumgart, Walter Zoller | 1997-09-16 |
| 5613985 | Hair coloring compositions which contain developers and perimidine couplers | Mustafa Akram | 1997-03-25 |
| 5597387 | Water-soluble polyazo dyestuffs | Dieter Baumgart, Walter Zoller | 1997-01-28 |