Photographic silver halide elements containing filter dyes
US4877721A · kind A · utility
11Cited by
11References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 23, 1988 |
| Grant date | Oct 31, 1989 |
| Priority date | — |
| Expiry date | Aug 23, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/832
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A methine oxonol dye having a bis-(2-pyrazolin-5-one nucleus) substituted with PA0 (a) acyl groups in the 3 and 3' position; PA0 (b) aryl groups in the 1 and 1' position; and PA0 (c) bearing from 4 to 6 acidic substituents, each of which are capable of forming a monovalent anion provided that at least two of such substituents are other than carboxyl, is disclosed for use as filter dyes in photographic elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.