Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886517 | Dyeing composition for human hair containing an azo dye | Andree Bugaut, Alex Junino | 1989-12-12 |
| 4875902 | Alkyl derivatives of hydroquinone as antioxidants in oxidation dyeing compositions | Jean F. Grollier | 1989-10-24 |
| 4863481 | Dyeing compositions based on oxidation dyestuff precursors and on n-substituted ortho-nitroanilines and comprising an alkanolamine and bisulphite, and their use in the dyeing of keratin fibres | Christian Monnais | 1989-09-05 |