Polycyclic dyes
US5183888A · kind A · utility
1Cited by
4References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1990 |
| Grant date | Feb 2, 1993 |
| Priority date | — |
| Expiry date | Nov 9, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B57/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the preparation of certain polycyclic dyes and in particularly the preparation of a polycyclic dye of Formula I: ##STR1## By reacting a phenyltartronic acid of Formula II: ##STR2## With either a compound of Formula III: ##STR3## or a compound of Formula IV: ##STR4##
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.