Patents by Inventor Yoshisada Nakamura

Yoshisada Nakamura 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: 4880730
    Abstract: A silver halide photographic light-sensitive material comprising a support having thereon at least one colored layer, and the layer can be decolored or lightened upon photographic processing of the photographic light-sensitive material,wherein the colored layer is formed by a process comprising the step of:color developing at least one colorless or light-colored leuco-dyestuff utilizing at least one metal salt of an organic acid.
    Type: Grant
    Filed: December 6, 1988
    Date of Patent: November 14, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kozo Sato, Yoshisada Nakamura
  • Patent number: 4842985
    Abstract: A conventional silver halide color photographic material is described, containing a coupler having a dye moiety having the maximum absorption wave length shifted to a short wave length by a linkage which is cleaved directly or through a timing group by a coupling reaction with the oxidation product of a developing agent and forming a compound or the precursor thereof (compound A) having a dye moiety having the maximum absorption wave length before shifting as the result of the above-described reaction and a compound capable of fixing the hue of the compound A at a long wave length and/or capable of immobilizing the compound A in the photographic layer.
    Type: Grant
    Filed: December 8, 1987
    Date of Patent: June 27, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Mitsunori Ono, Koji Tamoto, Keiji Mihayashi, Seiji Ichijima, Isamu Itoh, Yoshisada Nakamura
  • Patent number: 4824773
    Abstract: A silver halide color photographic material comprising a support having thereon at least a silver halide emulsion layer containing a compound represented by formula (I) ##STR1## wherein R.sup.1 and R.sup.2 each represents a hydrogen atom, an alkyl group, an alkoxy group, a halogen atom, an alkoxycarbonyl group, a carbamoyl group, a carbonamido group, a sulfonamido group, or a sulfamoyl group; R.sup.3 represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, or a carbonamido group; X represents a halogen atom or an alkoxy group; R.sup.4 represents a carbamoyl group, an alkylsulfonyl group, an arylsulfonyl group, or a sulfamoyl group; R.sup.5 represents a hydrogen atom, a halogen atom, a halogen-substituted alkyl group, a nitro group, a cyano group, a carbamoyl group, a sulfamoyl group, an alkylsulfonyl group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkoxy group, an aryloxy group, a carbonamido group, or a sulfonamido group; provided that at least one of said R.
    Type: Grant
    Filed: April 23, 1987
    Date of Patent: April 25, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shingo Sato, Yoshisada Nakamura, Koji Tamoto
  • Patent number: 4711837
    Abstract: A silver halide color photographic material comprising a support having provided thereon at least one silver halide emulsion layer, wherein the photographic material contains a compound having a dye portion in which the maximum absorption wavelength is shifted by a bond that is cleaved upon reaction with an oxidation product of a developing agent and is capable of forming a diffusion resistant compound having a dye portion possessing the maximum absorption wavelength which is not shifted as a result of the reaction with an oxidation product of a developing agent.By the use of the compound which permits a large degree of freedom with respect to selection of the dye for forming a color image according to the present invention, the color photographic material has an excellent image quality, and a good fastness of image or a high sensitivity.
    Type: Grant
    Filed: August 27, 1985
    Date of Patent: December 8, 1987
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Seiji Ichijima, Mitsunori Ono, Isamu Itoh, Keiji Mihayashi, Koji Tamoto, Yoshisada Nakamura