US4391884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of a photographic color image by the silver dye bleach process and suitable color photographic material therefor
Assignee: Ilford Imaging Switzerland GmbH
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Filing: 1981-04-17
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Granted: 1983-07-05
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Expires: 2001-04-17
Abstract
Abstract A process for the production of a photographic color image by the silver dye bleach process, using a photographic material which comprises, on a base, at least one light-sensitive silver halide emulsion layer, which can contain a diffusion-resistant bleachable image dye, and immediately above this layer, on the side facing the light source, a silver halide-free layer containing a diffusion-resistant, bleachable image dye. The process gives very sharp photographic color images.
Inventors
- 👤 Armin Meyer
- 👤 Carlo Boragine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:04
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/28
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
142 words
A process for the production of a photographic colour image by the silver dye bleach process, by exposure, silver developing, dye bleaching, silver bleaching and fixing, and using a photographic material which contains light-sensitive silver halide layers and dye layers on a base, which process comprises exposing image-wise a photographic material, which has at least one light-sensitive silver halide emulsion layer, which can contain a diffusion-resistant, bleachable image dye, and immediately above it, on the side facing the light source, a silver halide-free layer containing a diffusion-resistant bleachable image dye, the light-sensitive silver halide emulsion layer and silver halide-free layer being free from a dye bleach catalyst and processing the material in a processing bath containing a dye bleach catalyst, to give a colour image, the colour image being produced exclusively by image dyes present in the photographic material prior to exposure.
Claim 2
Dependent Claim
142 words
A process for the production of a photographic colour image by the silver dye bleach process, by exposure, silver developing, dye bleaching, silver bleaching and fixing, and using a photographic material which contains light-sensitive silver halide layers and dye layers on a base, which process comprises exposing image-wise a photographic material, which has at least one light-sensitive silver halide emulsion layer, which can contain a diffusion-resistant, bleachable image dye, and immediately above it, on the side facing the light source, a silver halide-free layer containing a diffusion-resistant bleachable image dye, the light-sensitive silver halide emulsion layer and silver halide-free layer being free from a dye bleach catalyst and processing the material in a processing bath containing a dye bleach catalyst, to give a colour image, the colour image being produced exclusively by image dyes present in the photographic material prior to exposure.
Claim 3
Dependent Claim
26 words
A process according to claim 1, wherein the same image dye is used in the silver halide-containing layer and in the adjacent silver halide-free dye layer.
Claim 4
Dependent Claim
20 words
A process according to claim 2, wherein the image dye is a cyan dye, magenta dye or a yellow dye.
Claim 5
Dependent Claim
43 words
A process according to claim 3, wherein the photographic material contains 3 pairs each comprising a silver halide-containing dye layer and an adjacent silver halide-free dye layer, each of the pairs of layers containing one of the image dyes cyan, magenta or yellow.
Claim 6
Dependent Claim
20 words
A process according to claim 4, wherein the photographic material can contain additional protective layers, separating layers or filter layers.
Claim 7
Dependent Claim
25 words
A process according to claim 5, wherein the protective layers, separating layers and filter layers can contain a cyan dye, magenta dye or yellow dye.
Claim 8
Dependent Claim
19 words
A process according to claim 6, wherein the silver halide-free layers containing image dye can serve as protective layers.
Claim 9
Dependent Claim
78 words
A process according to claim 7, wherein the photographic material comprises coated on a support a gelatin subbing layer, a red-sensitive emulsion layer containing a cyan dye, an emulsion-free layer containing a cyan dye, a silver halide-free layer containing a magenta dye, a green sensitive emulsion layer containing a magenta dye, a layer containing a magenta dye, a silver halide-free layer containing a yellow dye, a blue-sensitive emulsion layer containing a yellow dye and a gelatine protective layer.
Claim 10
Dependent Claim
31 words
A process according to claim 1, wherein the light-sensitive silver halide emulsion is sensitised in such a way that is sensitivity maximum matches the absorption maximum of the corresponding image dye.
Claim 11
Dependent Claim
32 words
A process according to claim 1, wherein the light-sensitive silver halide emulsion is sensitised in such a way that its sensitivity maximum does not match the absorption maximum of the image dye.
Claim 12
Dependent Claim
20 words
A process according to claim 1, wherein a cubic-monodisperse silver halide emulsion is used in at least one light-sensitive layer.
Claim 13
Dependent Claim
28 words
A colour photographic material for the silver dye bleach process, suitable for use in the process according to claim 1, which has the composition stated in claim 1.
Claim 14
Dependent Claim
34 words
A colour photographic material for the silver dye bleach process according to claim 12, wherein the silver halide-free dye layer located above the silver halide emulsion layer of a layer pair absorbs scattered light.
Claim 15
Dependent Claim
11 words
The colour images produced by a process according to claim 1.
References Cited (Backward Citations)
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Cited
US2278984A
Cited
US3498787A
Cited
US3787215A
Cited
US3650739A
Cited
US3743506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |