Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5980586 | Oxidative hair dyeing process with dihydroxybenzenes and aminoethanethiols | Gottfried Wenke | 1999-11-09 |
| 5603734 | Hair dyeing with persulfate oxidants and catechols | Gottfried Wenke | 1997-02-18 |
| 5584889 | Oxidative hair dyeing process with dihydroxybenzenes and aminoethanethiols | Gottfried Wenke | 1996-12-17 |
| 5435810 | Hair dyeing process with aminoalkylthio substituted dihydroxybenzene and oxidative agents | Gottfried Wenke | 1995-07-25 |
| 5374288 | Oxidative hair dyeing method, composition, and kit utilizing hydroxyl substituted benzothiazines | Gottfried Wenke | 1994-12-20 |