Diffusion transfer photographic film unit
AssigneePolaroid Corporation
InventorsJames A. Foley, Michael P. Filosa, Stephen J. Telfer, John L. Marshall, David P. Waller
Life of this patent
Estimating the term…
Abstract
A self-developing diffusion transfer photographic film unit which includes a latent image which becomes visible upon photographic processing of the film unit. The latent image is formed with a chemical compound such as an indicator dye and the visible image formed from the latent image as a result of photographic processing may be transient or permanent. Also described are diffusion transfer photographic methods.
Claims16
A diffusion transfer photographic film unit comprising a photosensitive element comprising a support carrying at least one silver halide emulsion layer;
- a second sheet-like element which is in superposed relationship or adapted to be placed in superposed relationship with said photosensitive element;
- an image-receiving layer positioned in one of said photosensitive and second sheet-like elements;
- means providing an aqueous alkaline processing composition for distribution between predetermined layers of said elements,
- and a latent image carried by at least one of said photosensitive and second sheet-like elements, said latent image comprising a chemical compound capable of forming a visible image upon contact with said aqueous alkaline processing composition, said chemical compound not being exposed silver halide.
Dependencies are inferred from the claim text.