Patents by Inventor Yasumasa Numata

Yasumasa Numata 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).

  • Silver halide color photographic material
    Patent number: 4994351
    Abstract: A silver halide color photographic material is described which is to be processed by a scheme including at least the step of development with a color developer having a pH of at least 11 wherein said material contains a specific pyrazoloazole based magenta coupler and a compound that react with the oxidized product of a color developing agent and which substantially lacks the ability to impart an image density. The color photographic material is improved in granularity and color reproduction and yet permits efficient desilvering.
    Type: Grant
    Filed: June 15, 1989
    Date of Patent: February 19, 1991
    Assignee: Konica Corporation
    Inventors: Yoshihiro Haga, Katuya Yabuuchi, Yasumasa Numata
  • Silver halide color photo-sensitive material
    Patent number: 4690888
    Abstract: A photosensitive silver halide colored photographic material having (1) ballasted couplers combined with photosensitive silver halide emulsions and (2) colored compounds capable of reacting with oxidized developing agent, wherein the colored compounds are capable of diffusing in the photographic material during developing treatments and have their principal absorption in the main absorption wavelength region of the dye produced by the reaction of the coupler with the developing agent.
    Type: Grant
    Filed: September 10, 1985
    Date of Patent: September 1, 1987
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Mitsuto Fujiwhara, Takao Nimura, Yasumasa Numata, Yasuko Matsubara
  • Colored light-sensitive silver halide photographic material with coating additive
    Patent number: 4105453
    Abstract: A light-sensitive silver halide photographic material comprising a basic mordant, an acidic dye, a hydrophilic colloid layer containing a compound (I) and a layer containing a compound (II) which layer is adjacent to said hydrophilic layer.
    Type: Grant
    Filed: March 11, 1977
    Date of Patent: August 8, 1978
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Yasumasa Numata, Kunio Ito, Keiichi Mori, Yoshitami Ono