Novel dyeing system
US4921503A · kind A · utility
15Cited by
6References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1988 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | Sep 12, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K8/492
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Substituted 3-aryl amino-indoline-2-ones, produced by the reaction of certain isatins and amines are among a group of compounds useful as hair colorants. The hair itself appears to function as a dye-formation promoter, so that no oxidative reagents are needed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.