Photographic element containing an azopyrazolone masking coupler exhibiting improved keeping
US5482821A · kind A · utility
1Cited by
8References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1993 |
| Grant date | Jan 9, 1996 |
| Priority date | — |
| Expiry date | Sep 30, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/3225
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention provides a photographic process and element where the element comprises a light sensitive silver halide layer containing (1) an image dye-forming bicyclic azole coupler having bonded to the coupling site a group other than hydrogen which is clearable during the development process; (2) an azopyrazolone masking coupler; and (3) a stabilizing coupler having bonded to the coupling site only hydrogen atoms and/or carbon atoms which are not cleavable to permit dye formation during development.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.