Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 | Jean Cotteret | 1989-09-05 |