Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4997451 | Oxidative hair dyeing compositions based on 4-aminophenol derivatives and new 4-aminophenol derivatives | Thomas Clausen, Wolfgang Balzer | 1991-03-05 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4997451 | Oxidative hair dyeing compositions based on 4-aminophenol derivatives and new 4-aminophenol derivatives | Thomas Clausen, Wolfgang Balzer | 1991-03-05 |