Patents by Inventor Yoko Idogaki

Yoko Idogaki 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: 5356766
    Abstract: A silver halide photographic light-sensitive material comprises a support having provided thereon at least one light-sensitive emulsion layer and at least one hydrophilic colloid layer containing a solid fine grain dispersion of a dye, wherein the light-sensitive material contains at least one solid fine grain dispersion of a dye represented by formula (I) and at least one solid fine grain dispersion of a dye represented by formula (II): ##STR1## where R.sub.1, R.sub.2, R.sub.21, R.sub.22, R.sub.23, R.sub.24, L.sub.1, L.sub.2, L.sub.3, L.sub.21, and n are as defined in the specification. The use of the dyes in the form of solid fine grain dispersions prevents transfer or migration of the dyes between hydrophilic colloid layers.
    Type: Grant
    Filed: January 27, 1994
    Date of Patent: October 18, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Yoko Idogaki
  • Patent number: 5294529
    Abstract: There is disclosed a silver halide color photographic material having at least one silver halide emulsion layer on a base, which comprises in the silver halide emulsion layer a magenta coupler, an image-dye stabilizer, and a high-boiling organic solvent of which the weight ratio to the coupler is 3.0 or over. The disclosure as described provides a color photographic material being excellent in color reproduction and having improved light-fastness of magenta color image with good balance from high density part to low density part.
    Type: Grant
    Filed: April 28, 1992
    Date of Patent: March 15, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yoko Idogaki, Osamu Takahashi
  • Patent number: 5272050
    Abstract: There is disclosed a silver halide photographic material, which comprises a compound represented by the following formula (I): ##STR1## wherein R.sub.1 and R.sub.2 each represent a hydrogen atom or a group being capable of substitution; W represents a nitrogen atom or a carbon atom; Z represents --Y.sub.1 --(R.sub.3).sub.n2 or R.sub.3 in which R.sub.3 represents a hydrogen atom or a group being capable of substitution; n.sub.0, n.sub.1, and n.sub.2 each are 0 or 1; h is 1 or 2; R.sub.1, R.sub.2, and R.sub.3 may bond together to form a carbocyclic ring or a heterocyclic ring; when n.sub.1 and n.sub.2 each are 1, Y.sub.1 represents --CO--, --C(.dbd.NR.sub.4)--, --C(.dbd.S)--, --C(.dbd.N.sup.+ R.sub.5 R.sub.6)--, --SO--, --SO.sub.2 --, --C(.dbd.CR.sub.7 R.sub.8)--, --R.sub.6 C.dbd.N--, or --R.sub.6 C.dbd.CR.sub.9 --, in which R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8, and R.sub.9 each represent a hydrogen atom or a group being capable of substitution; when n.sub.1 and n.sub.2 each are 0, Y.sub.
    Type: Grant
    Filed: July 9, 1992
    Date of Patent: December 21, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tetsunori Matsushita, Yoko Idogaki
  • Patent number: 5266453
    Abstract: A silver halide photographic light-sensitive material which provides an improved safelight property without adversely affecting the photographic properties of the light-sensitive material. The silver halide photographic light-sensitive material contains at least one compound represented by formula (I): ##STR1## wherein R.sub.1 and R.sub.2 each represent a hydrogen atom or a substitutable group; W represents a nitrogen atom or a carbon atom; Z represents --Y.sub.1 --(R.sub.3)n.sub.2 or R.sub.3 in which R.sub.3 represents a hydrogen atom or a substitutable group; n.sub.0, n.sub.1 and n.sub.2 each represents 0 or 1; h represents 1 or 2; R.sub.1 and R.sub.2 and R.sub.3 may combine with each other to form a hydrocarbon ring or a heterocyclic ring; Y.sub.1 represents --CO--, --CO(.dbd.NR.sub.4)--, --C(.dbd.S)--, --C(.dbd.N.sup.+ R.sub.5 R.sub.6)--, --SO--, --SO.sub.2 --, --C(C.dbd.CR.sub.7 R.sub.8)--,--R.sub.6 C.dbd.N--, or --R.sub.6 C.dbd.CR.sub.9 --in [(R.sub.1).sub.n1 --Y.sub.1 ] when n.sub.1 is 1 and in --Y.
    Type: Grant
    Filed: April 10, 1992
    Date of Patent: November 30, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tetunori Matushita, Yoko Idogaki
  • Patent number: 5238799
    Abstract: Disclosed is a silver halide photographic material having a hydrophilic colloid layer which contains a dispersion of fine solid grains of at least one dye of formula (I): ##STR1## where R.sub.1 and R.sub.2 each represents an alkyl group, an aryl group, a cyano group or a group of COOR.sub.3, COR.sub.3, CONR.sub.4 R.sub.5, NR.sub.4 R.sub.5, NR.sub.4 COR.sub.3, NR.sub.4 CONR.sub.4 R.sub.5, OR.sub.3, SR.sub.3, SOR.sub.3 or SO.sub.2 R.sub.3 ; R.sub.3 being an alkyl group or an aryl group, and R.sub.4 and R.sub.5 each being a hydrogen atom, an alkyl group or an aryl group, and R.sub.3 and R.sub.4 or R.sub.4 and R.sub.5 being optionally bonded to each other to form a 5-membered or 6-membered ring; L.sub.1, L.sub.2 and L.sub.3 each represents a methine group; and n represents 0 or 1; provided that R.sub.1, R.sub.2, L.sub.1, L.sub.2 and L.sub.3 must not have an ionizable proton-having group or a salt thereof.
    Type: Grant
    Filed: September 17, 1992
    Date of Patent: August 24, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takashi Usami, Shigeru Ohno, Yoko Idogaki
  • Patent number: 5108886
    Abstract: There is disclosed a silver halide color photographic material having at least one silver halide emulsion layer on a base, which comprises in the silver halide emulsion layer a magenta coupler represented by formula (I), which has been dispersed by using a chlorinated paraffin having 8 or more carbon atoms. The disclosure as described provides a color photographic material being excellent in color reproduction and having improved light-fastness of the magenta color image from the high density part to the low density part, even when the color photographic material is processed by the color developer contaminated by a small amount of bleaching solution formula (I): ##STR1## wherein Za and Zb each represent .dbd.CH--, ##STR2## or .dbd.N--, R.sub.1 represents a hydrogen atom or a substituent, R.sub.2 represents a substituent, X represents a hydrogen atom or a group or an atom capable of being released, andi) when there is no R.sub.2 in the molecule, R.sub.
    Type: Grant
    Filed: December 11, 1990
    Date of Patent: April 28, 1992
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Yoko Idogaki