Pyrazolonoxonol compounds
US5556985A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1995 |
| Grant date | Sep 17, 1996 |
| Priority date | — |
| Expiry date | Jan 27, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/832
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A novel pyrazolonoxonol compound represented by formula (A) and a silver halide photographic material comprising such a pyrazolonoxonol compound: ##STR1## wherein R.sub.1 and R.sub.2 each represents a hydrogen atom, an alkyl group or an aryl group, and the alkyl groups represented by R.sub.1 and R.sub.2 may bond each other to form a saturated 5- or 6-membered ring; R.sub.3 represents a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group, a hydroxyl group, an alkoxy group, a carboxyl group, an ester group, a carbamoyl group, an amino group, an acylamino group, an ureide group, an urethane group or a cyano group; L.sub.1, L.sub.2, L.sub.3, L.sub.4 and L.sub.5 each represents a methine group, and the methine groups which are not adjacent to each other may bond each other to form a 5- or 6-membered ring; M represents a hydrogen atom or a monovalent cation; and m and n each represent an integer 0 or 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.