Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5676706 | Substituted diaminophenols, and hair dyes containing such compounds | Wolfgang Wolff, Andreas Bittner, Uwe Kobs | 1997-10-14 |
| 5613985 | Hair coloring compositions which contain developers and perimidine couplers | Wolfgang Bauer | 1997-03-25 |