Synthesis of melanoquaternary compounds and their use as hair dyes and for skin treatment
US6313313A · kind A · utility
0Cited by
7References
14Claims
0Family size
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Key dates
| Filing date | Sep 18, 1998 |
| Grant date | Nov 6, 2001 |
| Priority date | — |
| Expiry date | Sep 18, 2018 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q5/065
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Water soluble, cationic compounds useful as hair colorants or for the treatment of skin which are esters or amides formed by reaction of 5,6-dihydroxyindole-2-carboxylic acid or its N-substituted derivatives and a quaternary salt containing a reactive amino or hydroxyl group, and polymers from such compounds obtained by oxidative polymerization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.