Patents by Inventor Tadahiko Obikawa

Tadahiko Obikawa 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).

  • Light-sensitive silver halide color photographic material
    Patent number: 4153460
    Abstract: A light-sensitive silver halide color photographic material is disclosed which contains a support having coated thereon a red-sensitive silver halide emulsion layer, a non-light-sensitive layer adajcent to the red-sensitive silver halide emulsion layer, and a light-sensitive silver halide emulsion layer adjacent to the non-light-sensitive layer. The non-light-sensitive layer contains substantially non-light-sensitive silver halide grains while the red-sensitive silver halide emulsion layer contains a DIR compound and a particular 2-equivalent substantially colorless cyan coupler.
    Type: Grant
    Filed: February 7, 1978
    Date of Patent: May 8, 1979
    Assignee: Konishiroku Photo Industry Co., Ltd
    Inventors: Toshifumi Iijima, Tadahiko Obikawa, Motoaki Tanaka
  • Silver halide photographic emulsion sensitized with a mixture of oxacarbocyanine dyes
    Patent number: 4026707
    Abstract: Silver halide supersensitized with a mixture of naphthoxazole and benzoxazole carbocyanine dyes.
    Type: Grant
    Filed: August 12, 1976
    Date of Patent: May 31, 1977
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Tadahiko Obikawa, Shigemasa Itoh