Patents by Inventor Ruth L. Hill

Ruth L. Hill 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).

  • Spectrally sensitized photosensitive silver halide emulsion
    Patent number: 4387155
    Abstract: Photosensitive silver halide emulsions containing a green-sensitive dye of the formula ##STR1## wherein R is hydrogen or chlorine. The invention is also directed to the novel sensitizing dyes.
    Type: Grant
    Filed: May 26, 1981
    Date of Patent: June 7, 1983
    Assignee: Polaroid Corporation
    Inventors: Ruth L. Hill, Roger E. Jerry
  • Thiacyanine betaine blue sensitizing dyes
    Patent number: 4250244
    Abstract: Photosensitivity of a blue-sensitive emulsion in a multi-color diffusion transfer photographic system is enhanced by sensitizing the emulsion with certain 3,3'-disubstituted 4,5-benzothia-thiacyanine betaines.
    Type: Grant
    Filed: February 2, 1977
    Date of Patent: February 10, 1981
    Assignee: Polaroid Corporation
    Inventors: Alan L. Borror, Ruth L. Hill