Patents by Inventor Keiji Mihayashi

Keiji Mihayashi 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: 5328818
    Abstract: A silver halide color photographic light-sensitive material includes red-, green- and blue-sensitive silver halide emulsion layers, and a non-light-sensitive layer, and contains a dye of the following formula (I). The emulsion layer or the non-light-sensitive layer contains a yellow coupler of the following formula (1) or (2), or an acylacetamide type yellow coupler having an acyl group of the following formula (Y): ##STR1## where X and Y represent an electron attractive group, or when coupled with each other, XY represents an acidic nucleus, Ar represents a phenyl group or a heterocyclic group, and L.sup.1, L.sup.2 and L.sup.3 represent a methine group, ##STR2## where X.sub.1 and X.sub.2 represent an alkyl group, an aryl group, or a heterocyclic group, X.sub.3 represents an organic group which forms a nitrogen-containing heterocyclic group together with >N--, Y represents an aryl group or a heterocyclic group, and Z represents a split-off group, ##STR3## where D.sup.
    Type: Grant
    Filed: September 17, 1992
    Date of Patent: July 12, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroshi Fukuzawa, Kohzaburoh Yamada, Keiji Mihayashi, Koji Tamoto, Shigeru Shibayama, Minoru Sato, Kiyoshi Nakazyo
  • Patent number: 5326680
    Abstract: A silver halide color photographic light-sensitive material having at least one light-sensitive silver halide emulsion layer formed on a support wherein the light-sensitive material contains a compound represented by the following general formula (I): ##STR1## wherein A is a coupler residual or an oxidation-reduction group, X.sub.1 is an oxygen atom or a sulfur atom, X.sub.2 is an oxygen atom, a sulfur atom or NX.sub.6 group, W is a carbon atom or a sulfur atom, X.sub.3, X.sub.4, X.sub.5 and X.sub.6 are each a hydrogen atom or an organic residual, any two of X.sub.3, X.sub.4 and X.sub.5 can be bivalent groups which form a ring, PUG is a photographically useful group capable of bonding at a hetero-atom and, in the formula (I), n.sub.1 is 1 if W is a carbon atom, and either 1 or 2 if W is a sulfur atom. If n.sub.1 is 2, two X.sub.1 can either be identical or different. On the other hand, n.sub.2 is either 1 or 2. If n.sub.2 is 2, two X.sub.3, two X.sub.4, and two x.sub.5 are either identical or different.
    Type: Grant
    Filed: May 19, 1992
    Date of Patent: July 5, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Atsuhiro Ohkawa, Tatsuhiko Obayashi, Keiji Mihayashi
  • Patent number: 5312726
    Abstract: A silver halide color light-sensitive material including a support having thereon at least one hydrophilic colloidal layer is disclosed, wherein the hydrophilic colloidal layer contains a DIR coupler represented by formula (I): ##STR1## wherein R.sup.1 represents a hydrogen atom, an aliphatic group, an aromatic group, or a heterocyclic group; R.sup.2 represents an organic group; X and Y each represent --N.dbd. or ##STR2## wherein R.sup.
    Type: Grant
    Filed: March 11, 1991
    Date of Patent: May 17, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Keiji Mihayashi, Seiji Ichijima, Toshio Kawagishi, Naoki Saito, Masuji Motoki
  • Patent number: 5306609
    Abstract: A silver halide color photographic material comprising a support having thereon at least one light-sensitive silver halide emulsion layer, wherein the silver halide color photographic material comprises i) a nondiffusive coupler represented by the general formula (I) or (II): ##STR1## and ii) an acyl acetamide coupler comprising, as an acyl group, a group represented by the general formula (A) ##STR2## The silver halide color photographic material provides a high color density and exhibits a small fluctuation of photographic performance during preservation thereof and improved color image fastness and color reproducibility.
    Type: Grant
    Filed: March 6, 1992
    Date of Patent: April 26, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Keiji Mihayashi, Takayoshi Kamio
  • Patent number: 5306603
    Abstract: A light-sensitive material having high light-sensitivity and high contrast and excelling in color reproduction at all light-exposed regions, yellow-image sharpness, magenta-image sharpness, and cyan-image sharpness, and having its sensitivity little deteriorated during storage. The material comprises at least one light-sensitive, silver halide emulsion layer on a support, and contains at least one specified compound which releases a photographically useful group, and a yellow-colored cyan coupler.
    Type: Grant
    Filed: June 3, 1992
    Date of Patent: April 26, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Keiji Mihayashi, Atsuhiro Ohkawa
  • Patent number: 5302503
    Abstract: A silver halide color photographic light-sensitive material includes a support and at least one hydrophilic colloid layer formed on the support. The hydrophilic layer contains a coupler compound which is represented by formula (I) below and has a high dye formation rate and a high color forming density. This silver halide color photographic light-sensitive material can achieve an improved sharpness and a high sensitivity:A--(SO.sub.2 NHCONR.sup.1 R.sup.2).sub.n Formula (I)(wherein A represents a coupler moiety, each of R.sup.1 and R.sup.2 independently represents a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, or a heterocyclic group, and n represents an integer of 1 or more, if n being an integer of 2 or more, respective R.sup.1 's and R.sup.2 's being able to be the same or different, and A and R.sup.1, A and R.sup.2, or R.sup.1 and R.sup.2 being able to combine to form a ring.
    Type: Grant
    Filed: February 18, 1992
    Date of Patent: April 12, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Naoki Saito, Keiji Mihayashi, Takayoshi Kamio
  • Patent number: 5300412
    Abstract: The present invention relates to a silver halide color photographic material having at least one light-sensitive silver halide emulsion layer or light-insensitive layer on a support, wherein the light-sensitive silver halide emulsion layer or a light-insensitive layer contains a yellow coupler selected from the group consisting of a yellow coupler represented by the following formula (I), a yellow coupler represented by the following formula (II) and combinations thereof, and a cyan coupler selected from the group consisting of a phenolic cyan coupler having a phenylureido group at the 2-position and a carbonamido group at the 5-position, a naphtholic cyan coupler having an amino group at the 5-position and combinations thereof; ##STR1## wherein X.sub.1 and X.sub.2 each represents an alkyl group, an aryl group, or a heterocyclic group; X.sub.
    Type: Grant
    Filed: February 28, 1992
    Date of Patent: April 5, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Keiji Mihayashi, Naoki Saito
  • Patent number: 5298383
    Abstract: Disclosed is a silver halide color photographic material having at least one light-sensitive emulsion layer on a support, in which at least 50%, as the total projected area, of all the silver halide grains in at least one light-sensitive emulsion layer are tabular grains having a mean aspect ratio of 2 or more and at least one layer constituting the material contains a coupler of the following formula (I) and/or a coupler of the following formula (II): ##STR1## where X.sup.1 and X.sup.2 each represents an alkyl group, an aryl group, or a heterocyclic group; X.sup.3 represents an organic residue forming a nitrogen-containing heterocyclic group along with >N-- in the formula; Y represents an aryl group or a heterocyclic group; and Z represents a group capable of being released from the formula when the coupler of the formula reacts with an oxidation product of a developing agent. The material preferably contains a compound of formula (A):Q--SM.sup.
    Type: Grant
    Filed: February 25, 1992
    Date of Patent: March 29, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Keiji Mihayashi, Naoki Saito, Shunichi Aida
  • Patent number: 5296339
    Abstract: A method for processing an imagewise exposed silver halide color photographic material comprising color developing the silver halide color photographic material with a color developer and then processing the photographic material with a processing solution having bleaching activity, in which the photographic material contains a coupler represented by the following general formula (I) and the replenishment rate of the color developer is not more than 600 ml/m.sup.2 of photographic material: ##STR1## wherein R.sup.1 represents a group of nonmetallic atoms necessary for forming a 5-membered unsaturated heterocyclic ring together with a ##STR2## R.sup.2 represents a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aromatic group or a heterocyclic group; R.sup.3 represents an alkyl group, an alkenyl group, an alkynyl group, an aromatic group, an alkoxy group, an aryloxy group, a heterocyclic oxy group or ##STR3## wherein R.sup.4 and R.sup.
    Type: Grant
    Filed: February 28, 1992
    Date of Patent: March 22, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yoshihiro Fujita, Keiji Mihayashi
  • Patent number: 5286620
    Abstract: A silver halide color photographic material comprising a support having provided thereon at least one silver halide emulsion layer, which is characterized by containing a compound represented by the following formula (I):A--L.sub.1 --L.sub.2 --INH--Q (I)wherein A represents a coupler residue; L.sub.1 represents ##STR1## wherein W represents an oxygen atom, a sulfur atom, or --N(R.sub.13)--, R.sub.11 and R.sub.12 independently represent a hydrogen atom or a substituent, and R.sub.13 represents a substituent, or R.sub.11, R.sub.12 and R.sub.13 may each represent a divalent group and be connected together to form a cyclic structure; L.sub.2 represents a group capable of releasing INH-Q through electron transfer along a conjugated system or has the same meaning as L.sub.1 ; INH represents a development inhibitor residue connected to L.sub.
    Type: Grant
    Filed: February 15, 1991
    Date of Patent: February 15, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Atsuhiro Ohkawa, Masuji Motoki, Keiji Mihayashi
  • Patent number: 5284740
    Abstract: A silver halide color photographic material is described comprising a support having provided thereon one or more red-sensitive silver halide emulsion layers, one or more green sensitive silver halide emulsion layers and one or more blue-sensitive silver halide emulsion layers wherein the average silver iodide content of silver halide in all the silver halide emulsion layers is not less than 10 mol% and the silver halide color photographic material contains a compound represented by the following general formula (I):Q--SM.sup.1 (I)wherein Q represents a heterocyclic group having at least one group selected from --SO.sub.3 M.sup.2, --COOM.sup.2, --OH and --NR.sup.1 R.sup.2 directly or indirectly connected thereto; M.sup.1 and M.sup.2 each represents a hydrogen atom, an alkali metal, a quaternary ammonium or a quaternary phosphonium; and R.sup.1 and R.sup.2 each represents a hydrogen atom or a substituted or unsubstituted alkyl group.
    Type: Grant
    Filed: February 27, 1992
    Date of Patent: February 8, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Keiji Mihayashi, Yoshihiro Fujita, Masatoshi Goto
  • Patent number: 5266456
    Abstract: Disclosed is a silver halide color photographic material containing a silver halide emulsion having a high silver iodide content and containing a novel yellow colored cyan coupler. The material has a high sensitivity, a good graininess, an excellent color reproducibility and a sufficient sharpness. The material has at least one light-sensitive emulsion layer on a support and is characterized in that it contains at least one yellow colored cyan coupler, that the emulsion layer contains chemically sensitized silver halide grains, and that the chemically sensitized silver halide grain in the emulsion has a silver iodobromide phase with a silver iodide content of from 15 to 45 mol % as a distinctly layered structure and has a silver iodide content of more than 7 mol % based on the whole grain.
    Type: Grant
    Filed: March 26, 1991
    Date of Patent: November 30, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Keiji Mihayashi, Takayoshi Kamio
  • Patent number: 5250397
    Abstract: A method for processing a silver halide color photographic material is disclosed, which comprises: color developing a silver halide color photographic material with a color developer containing an aromatic primary amine color developing agent, followed by processing with a processing solution having a bleaching ability, wherein the replenishment rate of said color developer is in the range of 600 ml or less per m.sup.2 of the photographic material, and wherein said silver halide color photographic material contains at least one yellow colored cyan coupler.
    Type: Grant
    Filed: April 2, 1991
    Date of Patent: October 5, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Katsushige Kamada, Keiji Mihayashi, Yoshihiro Fujita
  • Patent number: 5238803
    Abstract: The present invention relates to a silver halide color photographic photosensitive material which contains a coupler which can be represented by formula (1): ##STR1## wherein X1 and X2 each represent an alkyl group or a heterocyclic group, Y represents an aryl group or a heterocyclic group, and Z represents a group which is eliminated when the coupler which is represented by formula (1) reacts with an oxidized form of a developing agent.
    Type: Grant
    Filed: November 8, 1991
    Date of Patent: August 24, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Seiji Ichijima, Naoki Saito, Keiji Mihayashi
  • Patent number: 5215872
    Abstract: A method of processing a silver halide color photographic material is disclosed, comprising a support having provided thereon at least one light-sensitive emulsion layer, which comprises the steps of color developing the material with a developer to which a replenisher is added and bleaching the developed material, wherein the material contains a coupler represented by the following general formula (I) and the amount of replenisher added to the color developer is 600 ml or less per m.sup.2 of the material: ##STR1## wherein A represents a coupler group, and when A is a phenol or naphthol coupler group, n is 1, and when A is any other coupler group, n is 0; and R represents an alkyl group having from 1 to 4 carbon atoms, or a pyridyl group. Images having excellent photographic characteristics are obtained by the method even though the amount of the replenisher is reduced.
    Type: Grant
    Filed: April 16, 1991
    Date of Patent: June 1, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Masatoshi Goto, Keiji Mihayashi
  • Patent number: 5213958
    Abstract: A silver halide color photographic photosensitive material comprising a yellow image forming photographic coupler, which is capable of forming images having excellent color reproduction and image fastness, and which has a high reactivity with an oxidized form of a developing agent. The aforementioned object has been realized by means of a silver halide color photographic photosensitive material containing a coupler represented by general formula (I): ##STR1## wherein X represents an organic residual group which is required, together with the nitrogen atom, to form a nitrogen containing heterocyclic ring, Y represents an aromatic group or a heterocyclic group, and Z represents a group which is eliminated when the coupler represented by said general formula reacts with the oxidized form of a developing agent.
    Type: Grant
    Filed: October 18, 1991
    Date of Patent: May 25, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Masuji Motoki, Seiji Ichijima, Naoki Saito, Takayoshi Kamio, Keiji Mihayashi
  • Patent number: 5206379
    Abstract: Acylmethoxycarbonylbenzotrizoles with an ester substituent are disclosed which are represented by formula (I): ##STR1## wherein R.sub.1 is an aliphatic oxy group having 1-10 carbons or an aliphatic amino group having 2-10 carbons; R.sub.2 is hydrogen or an aliphatic group having 1-5 carbons; and the group ##STR2## is bonded to a 5- or 6-position of the benzotriazole and which are useful in silver halide photographic sensitive materials, synthesis intermediates therefor, synthesis intermediates for medicines, rust inhibitors for metals and the like.
    Type: Grant
    Filed: August 29, 1991
    Date of Patent: April 27, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Masuji Motoki, Seiji Ichijima, Keiji Mihayashi
  • Patent number: 5194369
    Abstract: A silver halide color light-sensitive material containing a coupler represented by formula (I): ##STR1## wherein R.sub.1 represents a substituted or unsubstituted alkyl group; R.sub.2 and R.sub.3, same or different, each represent a group capable of substituting a benzene ring; Y represents a halogen atom, an alkoxy group, an alkoxycarbonyl group, a substituted or unsubstituted alkyl group, an alkylthio group, an aryloxy group, an alkylsulfonyl group, an arylthio group, or a carbamoyl group; X represents an organic residue necessary to form a substituted or unsubstituted 5- or 6-membered nitrogen-containing heterocyclic ring together with the nitrogen atom; l represents 0 or an integer of from 1 to 5; and m represents 0 or an integer of from 1 to 4.The coupler of formula (I) is excellent in dye image stability.
    Type: Grant
    Filed: March 12, 1991
    Date of Patent: March 16, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Keiji Mihayashi, Seiji Ichijima, Toshio Kawagishi, Naoki Saito, Masuji Motoki
  • Patent number: 5187056
    Abstract: The present invention relates to a silver halide color photographic material, which contains a novel yellow coupler of formula (I) in at least one hydrophilic colloid layer which is provided on a support, ##STR1## where R.sup.1 represents a non-metallic atomic group necessary for forming a 5-membered unsaturated hetero ring together with a residue of ##STR2## in the formula; R.sup.2 represents a hydrogen atom, an aliphatic group, an aromatic group, or a heterocyclic group; R.sup.
    Type: Grant
    Filed: July 29, 1991
    Date of Patent: February 16, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Naoki Saito, Keiji Mihayashi
  • Patent number: 5178993
    Abstract: A method for rapidly processing a silver halide color photographic material is disclosed, comprising a support having at least one red-sensitive silver halide emulsion layer containing a cyan coupler, at least one green-sensitive silver halide emulsion layer containing a magenta coupler and at least one blue-sensitive silver halide emulsion layer containing a yellow coupler, wherein the photographic material contains a yellow colored cyan coupler, the total processing time for the photographic material is 8 minutes or less, and the processing solution having a bleaching ability for the photographic material contains an oxidizing agent having a redox potential of 150 mV or more. The rapid processing method yields excellent color reproducibility and the photographic material processed by the method has excellent resistance to fading.
    Type: Grant
    Filed: February 28, 1991
    Date of Patent: January 12, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yoshihiro Fujita, Keiji Mihayashi