Photographic silver halide color material having incorporated therein a ballasted heterocyclic-sulphonhydrazide color developing agent
US5284739A · kind A · utility
5Cited by
7References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 10, 1992 |
| Grant date | Feb 8, 1994 |
| Priority date | — |
| Expiry date | Nov 10, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/39236
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic materials having incorporated sulphonyhdrazide color developing agents. Such photographic materials have at least two color-forming units, each of which has a silver halide emulsion layer and a photographic coupler. A ballasted heterocyclic sulphonhydrazide color developing agent is present in the material in droplets of a high boiling point solvent. A method of forming a photographic color image using such materials is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.