Eastman-kodak Company

Alton L Chitty

Roger L Lok

Weimar W White

Pamela M Ferguson

Brian P Cleary

Douglas L Oehlbeck

Marian S Henry

Karen L Pond

Ward K Darron

Norman R Oneal

Silver halide photographic elements containing bis Au(I) sensitizers

The invention relates to a photographic element comprising a support and a silve halide emulsion layer wherein the silver halide emulsion contains at least one absorber dye and at least one sensitizing dye. The wavelength of maximum absorbance of said absorber dye and the wavelength of maximum sensitivity of the emulsion provided by the spectral sensitizing dye are substantially the same. The emulsion is chemically sensitized with a stable and water soluble AuI) complex. This provides manufacturing improvements, improved detail and sharpness, improved dodging and burning and lower cost without an unwanted increase in heat sensitivity.

Heat sensitivity improvement with combinations of gold sensitization and spectral sensitizing dye and filter device

A method for the reproducible production of nonuniform distributions of polymolecular association clusters, each of the clusters comprising a plurality of a species A in association with a single species B, is disclosed. Species A is preferably a photographic dye and Species B is preferably a silver halide particle. The method comprises: (a) mixing a suspension of particles of species B in a vessel; (b) flowing a portion of the suspension through an isolated reaction zone; (c) introducing species A into the isolated reaction zone; and (d) returning the portion of the suspension including the introduced species A to the vessel. In another aspect, the invention relates to an apparatus for carrying out the foregoing process.

Process and apparatus for reproducible production of non-uniform product

Growing community of inventors

Rochester, NY, United States of America

Alton L Chitty