Issued Patents 1989
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888445 | New 2,4-dinitro- or 2-amino-4-nitro- or 2-nitro-4-amino-6-hydroxyalkylanilines, the process for preparation thereof and their use in dyeing keratinous fibres, and especially human hair | Gerard Lang, Nicole Jehanno | 1989-12-19 |
| 4886517 | Dyeing composition for human hair containing an azo dye | Andree Bugaut, Jean Cotteret | 1989-12-12 |
| 4865617 | Dyeing compositions for keratinous fibres, especially for human hair, containing oxidation dye precursors and heterocyclic couplers | Alain Genet, Gerard Lang | 1989-09-12 |
| 4865618 | New chloro-meta-phenylenediamines, their use as couplers in the oxidation dyeing of keratinous fibres, dyeing compositions for hair containing these compounds and dyeing process using the said | Jean J. Vandenbossche, Herve Borowiak, Gerard Lang | 1989-09-12 |
| 4865619 | Use, as a coupler, of 2,4-diamino-1,3-dimethoxybenzene or one of its salts, in combination with oxidation dye precursors, for dyeing human hair, hair dyeing composition containing the said coupler and process for preparing the said coupler | Jean J. Vandenbossche, Herve Borowiak, Gerard Lang | 1989-09-12 |
| 4863480 | Substituted metaaminophenols, a process for their preparation, hair dyeing compositions containing them and a hair-dyeing process | Andree Bugaut | 1989-09-05 |
| 4863482 | Substituted 2-nitro metaphenylenediamines, a process for their preparation and their use in dyeing keratinous fibers, in particular human hair | Nicole Jehanno, Gerard Lang | 1989-09-05 |
| 4845293 | Dyeing composition containing halogenated 2-nitroanilines | Gerard Lang, Nicole Jehanno, Jean J. Vandenbosche | 1989-07-04 |
| 4822375 | Dyeing compositions for keratinous fibres based on indole derivatives, and new compounds | Gerard Lang, Herve Richard, Madeleine Leduc | 1989-04-18 |
| 4797129 | Dye compositions for keratinous fibres containing 2-nitro-metaphenylenediamines | Gerard Lang, Nicole Jehanno, Jean J. Vandenbosche | 1989-01-10 |