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US 4,047,956 AGranted
Low coating weight silver halide element and process
AssigneeE. I. Du Pont de Nemours and Company
InventorRalph Kingsley Blake, deceased
Life of this patent
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AssigneeE. I. Du Pont de Nemours and Company
InventorRalph Kingsley Blake, deceased
Estimating the term…
A novel photographic imaging element which comprises a support, at least one photosensitive silver halide layer, and at least one layer of colorant (e.g., colloidal silver), bleachable with an oxidizing bleach in accordance with images formed in the silver halide layer. Images are formed with such elements by imagewise exposure of the photosensitive silver halide layer and conventional development of the image therein followed by imagewise bleaching the colorant layer with an oxidizing bleach to reduce the optical density in areas of the colorant layer to form an image thereon corresponding to the developed image in the silver halide layer. The combined images in the photosensitive silver halide layer and the imagewise bleached colorant layer form a composite, high quality image having high density and efficiency in the use of silver, providing a substantial reduction in silver halide coating weight over conventional, all-silver halide elements.
A process of forming a composite image in a photosensitive element that comprises a support, a photosensitive silver halide emulsion layer on said support, and a contiguous colorant-containing layer in which the colorant is selected from the group consisting of an oxidatively bleachable dye, fogged silver, colloidal silver, colloidal mercury, colloidal palladium, colloidal copper, a copper film, and a lead film;
A process of forming a composite image in a photosensitive element that comprises a clear polyester film support, a photosensitive silver halide emulsion layer, and an underlayer of colloidal silver in gelatin, which process comprises:
A process of forming a composite image in a photosensitive element that consists essentially of a monolayer of photosensitive silver halide emulsion mixed with colloidal silver, on a support, which process comprises the steps of
The process of claim 15 wherein after the bleaching step the element is water-washed, and the remaining silver halide is removed by fixing in sodium thiosulfate solution.
Dependencies are inferred from the claim text.