Patents by Inventor Syoji Matsuzaka

Syoji Matsuzaka 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).

  • Patent number: 4497895
    Abstract: There is disclosed a method for preparing a silver halide photographic emulsion by use of an ammoniacal silver nitrate solution in a double-jet manner, characterized in that the method comprises the step of maintaining the ratio between the maximum and minimum solubility of the silver halide in a silver halide photographic emulsion at 3 or less after 1/10 of the total amount of the solution containing silver halide has been used.The method according to the present invention provides a monodispersed silver halide photographic emulsion which has a high sensitivity, i.e., which comprises silver halide having a relatively large crystal size.
    Type: Grant
    Filed: July 30, 1982
    Date of Patent: February 5, 1985
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Syoji Matsuzaka, Takeo Koitabashi, Yoshihiro Haga, Akio Suzuki, Hiroaki Shiozawa
  • Patent number: 4444877
    Abstract: A light-sensitive silver halide emulsion is disclosed, which comprises cores composed of silver halide grains and shells covering the cores. The cores consist essentially of silver halide containing silver iodide, and the shells consist essentially of silver bromide, silver chloride or silver chlorobromide excluding silver iodide. The shells have a thickness of from 0.01 to 0.1.mu.. This light-sensitive silver halide emulsion has high sensitivity and superior covering power.
    Type: Grant
    Filed: February 9, 1982
    Date of Patent: April 24, 1984
    Assignee: Konishiroku Photo Ind. Co., Ltd.
    Inventors: Takeo Koitabashi, Yoshihiro Haga, Syoji Matsuzaka