Photographic silver halide color materials
US5415981A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1993 |
| Grant date | May 16, 1995 |
| Priority date | — |
| Expiry date | Mar 4, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/3815
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of forming a photographic colour image which comprises imagewise exposing a photographic silver halide colour material and processing it with an alkaline developer solution in the presence of a sulphonhydrazide developer and a heteroarylacetonitrile colour coupler thus forming a dye image by reaction of oxidised colour developing agent and the colour coupler. A colour photographic material is also provided having at least two colour-forming units sensitive to different regions of the spectrum, each having a silver halide emulsion layer, characterised in that the material contains in or adjacent said layer, a ballasted photographic colour coupler and a ballasted sulphonhydrazide colour developing agent incorporated therein in droplets of a high boiling solvent and in which the colour coupler is a heteroarylacetonitrile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.