Bulk dyeing using quinophthalone dyestuffs
US5922904A · kind A · utility
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2References
3Claims
0Family size
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Key dates
| Filing date | Sep 15, 1998 |
| Grant date | Jul 13, 1999 |
| Priority date | — |
| Expiry date | Sep 15, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B25/00
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Benzoyl phthalic acids of the formula ##STR1## useful as intermediates in the preparation of quinophthalone dyestuffs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.