Eastman-kodak Company

Other

Francis J Evans

Paul B Gilman, Jr

Robert D Wilson

Arthur H Herz

Ralph W Jones, Jr

Cynthia G Jones

James T Kofron

John A Haefner

Herbert S Wilgus

Robert E Atwell

Robert E Booms

Gene L Oliver

This invention relates to a photographic recording material comprising a support and a photosensitive chemically sensitized silver halide emulsion layer, containing a sensitizing dye selected from the group consisting of oxonal dyes, merocyanine dyes, and cyanine dyes having a net negative charge, and which has a pH value between about 2 to about 5 and a pAg value between about 1 to about 4.7.

Performance of photographic emulsions at high silver ion concentrations

A photographic silver halide emulsion is disclosed in which the face centered cubic crystal lattice structure of the grains contain at adjacent cation sites metal ions chosen from group VIII, periods 5 and 6. The metal ions are placed at adjacent cation lattice sites by sensitizing the grains with oligomers each containing at least two of the group VIII metal ions.

Photographic emulsions sensitized by the introduction of oligomers

High aspect ratio chemically and spectrally sensitized tabular grain silver halide emulsions, photographic elements incorporating these emulsions, and processes for the use of the photographic elements are disclosed. In the tabular grain emulsions the silver halide grains having a thickness of less than 0.3 micron and a diameter of at least 0.6 micron have a high aspect ratio and account for at least 50 percent of the total projected area of the silver halide grains present.

Sensitized high aspect ratio silver halide emulsions and photographic

A photographic silver halide emulsion capable of forming on exposure an internal latent image can be formed having a desired characteristic curve by providing a first photographic silver halide emulsion comprised of silver halide grains internally sensitized with a combination of middle chalcogen and noble metal sensitizers capable of forming on exposure an internal latent image and blending therewith a second, higher contrast photographic silver halide emulsion comprised of silver halide grains internally sensitized with a relatively lower proportion of middle chalcogen to noble metal sensitization. Both the first and second photographic silver halide emulsions are sensitized with the same middle chalcogen and noble metal sensitizers.

Blended internal latent image emulsions, elements including such

This invention relates to improved spectral sensitization of silver halide emulsions containing silver halide grains having metal dopants occluded therein. In one aspect, methine dyes having a primary absorption peak at less than 700 millimicrons and a cathodic halfwave potential less positive than -1.0 volt can be incorporated in silver halide emulsions containing grains having metal dopants occluded therein at high concentrations which would normally cause considerable desensitization in a conventional surface-sensitive silver bromoiodide emulsion.

Growing community of inventors

Rochester, NY, United States of America

Francis J Evans