Eastman-kodak Company

John P Freeman

Roger L Lok

William N Baum

Donald W Heseltine

Wilbur S Gaugh

David M Sturmer

Richard L Parton

Wolfgang H Gunther

John D Mee

Karl E Wiegers

Fred M Macon

Roy L Orvis

Roger Lok

William H Baum

Radiation-sensitive silver halide photographic elements are disclosed which are protected against fog by cyclic dichalcogenides. A new cyclic oxaspiro ditelluride is disclosed.

Cyclic dichalcogenide fog inhibiting agents for silver halide photography

A radiation-sensitive composition including silver halide grains capable of forming an internal latent image and a nucleating agent is useful as a coating on a support to form a photographic element.

Photographic compositions and elements including internal latent image

Radiation sensitive silver halide photographic elements are disclosed which are protected from fog by hydrolyzed quaternized chalcogenazolium salts of middle chalcogens, wherein the quaternizing substituent contains a ##STR1## group in which T and T.sup.1 are carbonyl or sulfonyl and m is from 1 to 3.

Hydrolyzed azolium speed enhancing/fog-inhibiting agents for silver

Photographic speed increasing and latent image stabilizing compounds

Photographic silver halide emulsions show increased speed and reduced latent image fading when a compound of the following structure is incorporated: ##STR1## wherein: X is --O--, --S--, --Se--, or ##STR2## Y.sup.1 and Y.sup.2 individually represent hydrogen or an aromatic nucleus or together represent the atoms completing a fused aromatic nucleus;

Photographic speed increasing and latent image stabilizing compounds,

Photographic silver halide emulsions show increased speed and reduced latent image fading when a compound of the following structure is incorporated: ##STR1## wherein: X is -O-, -S-, -Se-, or ##STR2## Y represents the atoms completing a fused aromatic nucleus; Z is ##STR3## R is hydrogen or lower alkyl of from 1 to 5 carbon atoms.

Light-sensitive photographic emulsions are provided which feature at least one methine dye containing a silver halide sensitizing 1H-imidazo[4,5-b]pyrazine nucleus.

Photographic emulsions containing methine dyes having a

Light-sensitive photographic emulsions are provided which feature at least one methine dye containing a 1H-imidazo[4,5-b]pyrazine nucleus.

Growing community of inventors

Rochester, NY, United States of America

John P Freeman