Silver halide color photographic element and process containing leuco dyes
US3938995A · kind A · utility
13Cited by
6References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1974 |
| Grant date | Feb 17, 1976 |
| Priority date | — |
| Expiry date | Jul 10, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/26
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Color photographic elements, compositions and processes for producing color negative images are described which employ a leuco dye comprising the reaction product of a color forming coupler and a N,N-dialkyl-p-phenylenediamine having an electronegative group attached to the benzene ring. The leuco dye is stable against aerial oxidation and can be developed to its corresponding dye with certain black and white developing compositions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.