Patents by Inventor David A. Hallbery

David A. Hallbery has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Photographic donor material with non-photosensitive silver halide layer useful in a silver salt diffusion transfer process
    Patent number: 5322759
    Abstract: A photographic donor material useful in forming continuous tone images in a silver salt diffusion transfer process is comprised of a support; a photosensitive silver halide emulsion layer in which the silver halide is at least 80% silver chloride and is substantially free of iodide; and, located between the photosensitive silver halide emulsion layer and the support, a silver halide emulsion layer which is non-photosensitive under the conditions in which the donor material is used.
    Type: Grant
    Filed: November 9, 1992
    Date of Patent: June 21, 1994
    Assignee: Eastman Kodak Company
    Inventors: Anthony M. Barnett, David A. Hallbery, Roger J. Owers
  • Silver image bleaching solution and process
    Patent number: 5308746
    Abstract: A deletion fluid for use with lithographic printing plates comprising a silver image formed by the silver salt diffusion transfer process is comprised of an aqueous solution containing iodine, an iodide salt and a surfactant which comprises both polyalkyleneoxy units and a quaternary ammonium group.
    Type: Grant
    Filed: April 20, 1993
    Date of Patent: May 3, 1994
    Assignee: Eastman Kodak Company
    Inventors: Anthony M. Barnett, Colin J. Gray, Jeffrey K. Green, David A. Hallbery, Julie Baker
  • Photographic silver halide element containing small amounts of bromide ions
    Patent number: 5013638
    Abstract: A photographic donor material is described which comprises silver halide having at least 95% silver chloride, which material also contains a minor amount of bromide ions, an amount of development inhibitor and which has a hydrophilic overcoat layer to retard access of processing solution to the silver halide. The photographic material is useful in a silver salt diffusion transfer process.
    Type: Grant
    Filed: October 10, 1989
    Date of Patent: May 7, 1991
    Assignee: Eastman Kodak Company
    Inventors: Anthony M. Barnett, David A. Hallbery