Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5702712 | Melanoquaternary compounds and their use as hair dyes and for skin treatment | Gottfried Wenke | 1997-12-30 |
| 5686084 | Synthesis of quaternary melanin compounds and their use as hair dyes or for skin treatment | Gottfried Wenke | 1997-11-11 |
| 5628799 | Hair dying methods and kits which contain a dopa species, reactive direct dye, and a ferricyanide oxidant | Gottfried Wenke | 1997-05-13 |