Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5690921 | Hair fixing composition in the form of an aqueous solution, foam or gel | Gunther Lang | 1997-11-25 |
| 5674476 | Process for making a persulfate-containing granulate for decolorizing or bleaching hair | Wolfgang Balzer, Volker Port, Jolanthe Kujawa | 1997-10-07 |
| 5663366 | Process for the synthesis of 4,5-diaminopyrazole derivatives useful for dyeing hair | Hans Neunhoeffer, Stefan Gerstung, Wolfgang Balzer | 1997-09-02 |