Patents by Inventor Isao Oyagi

Isao Oyagi 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).

  • Pre-fogged direct-positive silver halide photographic light-sensitive material and method of preparing emulsion for the same
    Patent number: 5874207
    Abstract: A direct-positive silver halide light-sensitive material comprising a support having thereon at least one pre-fogged light-sensitive silver halide emulsion layer, wherein the light-sensitive material comprises a specific onium salt compound in the emulsion layer or a hydrophilic protective colloid layer adjacent thereto. Also disclosed is a method of preparing a pre-fogged light-sensitive silver halide emulsion for use in the light-sensitive material.
    Type: Grant
    Filed: May 16, 1997
    Date of Patent: February 23, 1999
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Isao Oyagi, Shingo Nishiyama, Nobuaki Inoue