Patents by Inventor William J. Pfingston

William J. Pfingston 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 products and processes with scavengers for silver ions or silver complexes
    Patent number: 4481277
    Abstract: This invention is concerned with producing color images of improved quality in photographic processes employing silver ion assisted cleavage reactions to provide a dye image by scavenging, i.e., rendering inert substantially all of the silver ion and/or soluble silver complex in the photographic system when image formation is substantially complete.
    Type: Grant
    Filed: February 2, 1983
    Date of Patent: November 6, 1984
    Assignee: Polaroid Corporation
    Inventor: William J. Pfingston
  • Stripping layer consisting of a mixture of cellulose acetate hydrogen phthalate and straight chain saturated polyester of adipic acid
    Patent number: 4401746
    Abstract: This invention relates to diffusion transfer photographic processes and to products useful therein which employ a stripping layer consisting of a mixture of cellulose acetate hydrogen phthalate and a straight chain saturated polyester of adipic acid to facilitate separation of a dyeable stratum from a contiguous gelatin layer, e.g., a gelatino silver halide emulsion layer or a gelatin layer containing an image dye-providing material.
    Type: Grant
    Filed: May 24, 1982
    Date of Patent: August 30, 1983
    Assignee: Polaroid Corporation
    Inventor: William J. Pfingston