Color-forming para-sulfonamidodiphenylamine dye precursor and sulfonimide dye in photographic material and process
US4390606A · kind A · utility
3Cited by
10References
55Claims
0Family size
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Key dates
| Filing date | Jul 1, 1982 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | Jul 1, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/156
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A color-forming para-sulfonamidodiphenylamine dye precursor in a photographic material and process enables formation of a sulfonimide dye image by means of cross-oxidation without the need for a coupling reaction. The color-forming para-sulfonamidodiphenylamine dye precursor is useful in a photographic silver halide material for producing (i) a dye image, or (ii) a dye image and silver image. The exposed photographic material is processed to produce (a) a positive dye image, (b) a negative dye and negative silver image, (c) a negative dye image or (d) a positive dye image and a positive silver image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.