Patents by Inventor Shigemasa Itoh

Shigemasa Itoh 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).

  • Silver halide photographic materials containing photographic yellow coupler
    Patent number: 4304845
    Abstract: The present invention relates to a process for forming a yellow color image which requires contacting exposed silver halide grain with a developer in the presence of a particular yellow coupler.
    Type: Grant
    Filed: June 20, 1980
    Date of Patent: December 8, 1981
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Wataru Fujimatsu, Shui Sato, Tamotsu Kojima, Shigemasa Itoh, Takaya Endo
  • Silver halide color photographic material
    Patent number: 4147547
    Abstract: A light-sensitive silver halide photographic material having improved anti-fogging properties is described.
    Type: Grant
    Filed: January 10, 1978
    Date of Patent: April 3, 1979
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Takeo Koitabashi, Noboru Fujimori, Shigemasa Itoh
  • Method for hardening gelatin
    Patent number: 4057538
    Abstract: This invention relates to a method of hardening gelatin which is accomplished by combining a compound containing at least one carbo-di-imide group with a compound having at least two vinyl sulfonyl groups. This combination has application to the photographic industry by providing a method of hardening the type of gelatin which is used in a gelatin -- containing photographic layer of a light-sensitive halide photographic material.
    Type: Grant
    Filed: February 12, 1975
    Date of Patent: November 8, 1977
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Teiji Habu, Tsuneo Wada, Takashi Sasaki, Shigemasa Itoh, Takayoshi Ohmura, Hiroki Ishii, Hisashi Yamaguchi
  • 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