Dye compositions containing 5,6-dihydroxy indoles and a foam generator
US5492541A · kind A · utility
9Cited by
10References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 5, 1990 |
| Grant date | Feb 20, 1996 |
| Priority date | — |
| Expiry date | Jan 5, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S424/01
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A process for preparing dye compositions which comprises hydrolyzing an O-protected 5,6-dihydroxyindole with an alkaline material under substantially anaerobic condition and the products made by such process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.