Patents by Inventor Haruhiko Kaji

Haruhiko Kaji 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 of forming super high-contrast negative images and silver halide photographic material and developer being used therefor
    Patent number: 5766833
    Abstract: An image-forming process developing a previously image-exposed silver halide photographic material with an alkaline developer containing a reductone compound as a main developing agent in the presence of a 1,2,5-thiadiazole compound and/or a 2,1,3-benzothiadiazole compound, and the silver halide photographic material and the photographic developer being used for the process are disclosed. In this case, the 1,2,5-thuiadiazole compound and/or the 2,1,3-benzothiadiazole may be contained in the silver halide photographic material and/or the alkaline developer. Super high-contrast images for photomechanical process having a gamma of higher than 15 and having no pepper and less fog can be obtained.
    Type: Grant
    Filed: July 8, 1997
    Date of Patent: June 16, 1998
    Assignee: Dainippon Ink and Chemicals Inc.
    Inventors: Kiyoshi Suematsu, Hiroaki Muratake, Haruhiko Kaji, Naoki Obi, Yasuhiko Kojima, Yasuo Shigemitsu
  • Process of forming super high-contrast negative images and silver halide photographic material and developer being used therefor
    Patent number: 5683854
    Abstract: An image-forming process developing a previously image-exposed silver halide photographic material with an alkaline developer containing a reductone compound as a main developing agent in the presence of a 1,2,5-thiadiazole compound and/or a 2,1,3-benzothiadiazole compound, and the silver halide photographic material and the photographic developer being used for the process are disclosed. In this case, the 1,2,5-thuiadiazole compound and/or the 2,1,3-benzothiadiazole may be contained in the silver halide photographic material and/or the alkaline developer. Super high-contrast images for photomechanical process having a gamma of higher than 15 and having no pepper and less fog can be obtained.
    Type: Grant
    Filed: September 12, 1996
    Date of Patent: November 4, 1997
    Assignee: Dainippon Ink and Chemicals Inc.
    Inventors: Kiyoshi Suematsu, Hiroaki Muratake, Haruhiko Kaji, Naoki Obi, Yasuhiko Kojima, Yasuo Shigemitsu