Process and kit for dyeing hair
US5273550A · kind A · utility
11Cited by
17References
43Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1991 |
| Grant date | Dec 28, 1993 |
| Priority date | — |
| Expiry date | Sep 26, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q5/10
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A process for dyeing hair by preparing and thereafter applying to the hair an aqueous reaction medium comprising dopa and an oxidant selected from ferricyanide and permanganate salts, said aqueous reaction medium further containing a buffer to maintain the pH in the range from 6 to 10 during the reaction, and removing said aqueous reaction medium from the hair within about one hour following its preparation
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.