Photographic silver halide materials and process comprising new pyrazoloazole coupler
US5302496A · kind A · utility
5Cited by
8References
39Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1992 |
| Grant date | Apr 12, 1994 |
| Priority date | — |
| Expiry date | Sep 18, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/3835
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Novel pyrazoloazole dye-forming couplers contain on the azole ring a group containing a carbon atom bonded directly to the azole ring and wherein this carbon atom is bonded directly to a nitrogen atom in the group. Such couplers provide advantageous bathochromic hue shift in dyes formed from the couplers. These couplers are useful in photographic silver halide materials and processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.