Patents by Inventor Yoshisato Minagawa

Yoshisato Minagawa 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: 4388401
    Abstract: A multilayer color reversal light-sensitive material is described, which can provide dye images having improved sharpness and graininess without a drop in color reproducibility, by employing a specific arrangement and construction of emulsion layers in its multi-layer structure, viz., a material comprising a support, a yellow filter layer, a group of green-sensitive emulsion layers, and a group of red-sensitive emulsion layers, wherein said emulsion layer groups are positioned nearer to the support than the yellow filter layer, each of the emulsion layer groups comprises at least two adjacent layers including a high-sensitivity silver halide emulsion layer containing silver halide grains having an average size of from 0.6.mu. to 2.0.mu. and a low-sensitivity silver halide emulsion layer containing silver halide grains having an average grain size of from 0.1.mu. to 0.5.mu.
    Type: Grant
    Filed: December 29, 1981
    Date of Patent: June 14, 1983
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kazunori Hasebe, Yoshisato Minagawa
  • Patent number: 4141730
    Abstract: In a multilayer color photographic material essentially comprising a support having coated thereon, in succession, a red-sensitive silver halide emulsion layer and a green-sensitive silver halide emulsion layer, with an optional yellow filter layer and a blue-sensitive silver halide emulsion layer, by disposing a non-sensitive auxiliary layer containing a non-diffusible colored coupling compound which releases a diffusible dye at color development capable of being removed from the photographic layer at development, an effective masking can be applied to the side absorption of cyan dye image without reducing the sensitivity of the red-sensitive silver halide emulsion layer during storage before or after exposure.
    Type: Grant
    Filed: April 7, 1976
    Date of Patent: February 27, 1979
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yoshisato Minagawa, Naoki Arai, Takehiko Ueda
  • Patent number: 3996055
    Abstract: A color photographic light-sensitive material, comprising a support having thereon at least one silver halide emulsion and the light sensitive material containing a colored cyan coupler having a main absorption in the blue region of the spectrum and a colored cyan coupler having a main absorption in the green region of the spectrum, and a colorless cyan coupler, each coupler being capable of coupling with an oxidation product of a p-phenylenediamine color-developing agent to form a cyan dye.
    Type: Grant
    Filed: December 23, 1974
    Date of Patent: December 7, 1976
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yoshisato Minagawa, Akio Okumura