Patents by Inventor Kenro Sakamoto

Kenro Sakamoto 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).

  • Process for treating light-sensitive silver halide color photographic materials
    Patent number: 4277556
    Abstract: Process for treating a light-sensitive silver halide color photographic material which comprises removing, after color development of the imagewise exposed light-sensitive silver halide color photographic material, the image silver with a bath containing hydrogen peroxide or a hydrogen peroxide releasing compound in combination with at least one compound selected from the group of lower alkyl aliphatic carboxylic acid, alkylidene diphosphonic acid and an alkali metal salt thereof under the conditions of forming substantially no dye image.
    Type: Grant
    Filed: August 15, 1977
    Date of Patent: July 7, 1981
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Sigeharu Koboshi, Isamu Fushiki, Kenro Sakamoto
  • Silver halide photosensitive element sensitized with an inorganic bismuth compound and the use thereof
    Patent number: 4069051
    Abstract: A light-sensitive silver halide photographic element containing an inorganic bismuth compound in the emulsion layer and/or constitutive layer and a method for developing said element after imagewise exposure is described.
    Type: Grant
    Filed: April 26, 1976
    Date of Patent: January 17, 1978
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Akira Horikoshi, Kenro Sakamoto, Toshihiko Koike, Yosuke Sadahiro, Toyohiko Kato
  • Photographic bleach-fixer
    Patent number: 4040837
    Abstract: This invention is directed to a bleach-fix which is stable, excellent in bleach-fix efficiency, applicable to the processing of high-speed, light sensitive silver halide color photographic materials and free from problems of environmental pollution.
    Type: Grant
    Filed: December 2, 1975
    Date of Patent: August 9, 1977
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Kenro Sakamoto, Isamu Fushiki, Sigeharu Koboshi