Patents by Inventor Hidetoshi Kobayashi

Hidetoshi Kobayashi 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: 5487968
    Abstract: A silver halide photographic material having at least one silver halide emulsion layer and at least one compound represented by a general formula (I) on a support:A-(TIME).sub.m -(RED).sub.n -Q (I)wherein A represents a group capable of releasing (TIME).sub.m -(RED).sub.n -Q by a reaction with an oxidation product of an aromatic primary amine developing agent;TIME represents a timing group capable of releasing (RED).sub.
    Type: Grant
    Filed: October 12, 1994
    Date of Patent: January 30, 1996
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yuki Mizukawa, Hidetoshi Kobayashi
  • Patent number: 5427902
    Abstract: There is disclosed an acylacetamide-type yellow coupler having an acyl group represented by formula (I) and a silver halide color photographic material containing same. ##STR1## wherein R.sub.1 represents a monovalent group, Q represents a group of non-metallic atoms required to form together with the C a substituted or unsubstituted 3- to 5-membered cyclic hydrocarbon group or a substituted or unsubstituted 3- to 5-membered heterocyclic group having in the group at least one hetero atom selected from a group consisting of N, O, S, and P, provided that R.sub.1 is not a hydrogen atom and does not bond to Q to form a ring.
    Type: Grant
    Filed: December 15, 1992
    Date of Patent: June 27, 1995
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yoshio Shimura, Hidetoshi Kobayashi, Yasuhiro Yoshioka
  • Patent number: 5418121
    Abstract: A multilayer silver halide color light-sensitive material including a yellow color-forming silver halide emulsion layer, a magenta color-forming silver halide emulsion layer, and a cyan color-forming silver halide emulsion layer, on a support. The light-sensitive material contains, in the yellow color-forming silver halide emulsion layer, at least one acylacetamide-type yellow coupler having an acyl group of a specified structure, and at least one organic compound selected from the group consisting of specified epoxy compounds, specified amide compounds, and esters having a melting point of 25.degree. C. or more at normal pressure and a molecular weight of 1000 or less.
    Type: Grant
    Filed: April 17, 1992
    Date of Patent: May 23, 1995
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yasuhiro Yoshioka, Hidetoshi Kobayashi
  • Patent number: 5359080
    Abstract: There is disclosed an acylacetamide-type yellow coupler having an acyl group represented by formula (I) and a silver halide color photographic material containing same. ##STR1## wherein R.sub.1 represents a monovalent group, Q represents a group of non-metallic atoms required to form together with the C a substituted or unsubstituted 3- to 5-membered cyclic hydrocarbon group or a substituted or unsubstituted 3- to 5-membered heterocyclic group having in the group at least one hetero atom selected from a group consisting of N, 0, S, and P, provided that R.sub.1 is not a hydrogen atom and does not bond to Q to form a ring.
    Type: Grant
    Filed: February 12, 1993
    Date of Patent: October 25, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yoshio Shimura, Hidetoshi Kobayashi, Yasuhiro Yoshioka
  • Patent number: 5314797
    Abstract: There is disclosed a silver halide color photographic material comprising a photosensitive silver halide emulsion layer that contains an acylacetamide yellow dye-forming coupler whose acyl group is represented by formula (I) and a high-boiling organic solvent, wherein the weight ratio of the high-boiling solvent to the coupler contained in said layer is 0.3 or below. ##STR1## wherein R.sub.1 represents a monovalent group, Q represents a group of nonmetallic atoms required to form together with C a 3- to 5-membered hydrocarbon ring or a 3- to 5-membered heterocyclic ring that contains a hetero atom selected from the group consisting of N, O, S, and P, provided that R.sub.1 is not a hydrogen atom and it does not bond to Q to form a ring.
    Type: Grant
    Filed: August 12, 1991
    Date of Patent: May 24, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yasuhiro Yoshioka, Yoshio Shimura, Hidetoshi Kobayashi
  • Patent number: 5300419
    Abstract: Disclosed is a silver halide color photographic material containing at least one cyan dye forming coupler of the following general formula (C-1) and at least one compound of the following general formula (I) in the same layer of the material: ##STR1## where R.sub.0 represents an alkyl group, an alkenyl group, an aryl group, or a heterocyclic group;X represents a hydrogen atom, or a group capable of being split off by a coupling reaction with the oxidation product of an aromatic primary amine color developing agent; andAr represents an aromatic group; ##STR2## where R.sub.1, R.sub.2 and R.sub.3 each represent an aliphatic group, an aryl group, or a heterocyclic group;R.sub.4 represents a hydrogen atom, an aliphatic group, an aryl group, or a heterocyclic group;R.sub.1 and R.sub.2, or R.sub.3 and R.sub.4 may be bonded to each other to form a 5-membered to 8-membered ring along with the nitrogen atom in the formula;the compound of formula (I) may form a dimer or a higher polymer at the position of R.sub.1, R.
    Type: Grant
    Filed: May 27, 1992
    Date of Patent: April 5, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Nobuo Seto, Hiroyuki Yoneyama, Masakazu Morigaki, Hidekazu Sakai, Hidetoshi Kobayashi, Shigeru Yamazaki
  • Patent number: 5294524
    Abstract: There is disclosed a silver halide color photographic material which comprises in a blue-sensitive silver halide emulsion layer acylacetamide yellow dye-forming couplers represented by the following formula (I) and in a red-sensitive silver halide emulsion layer cyan dye-forming couplers represented by the following formula (II) or (III): ##STR1## wherein R.sub.1 represents a monovalent group, Q represents a group of non-metallic atoms required to form together with the C a substituted or unsubstituted 3- to 5-membered cyclic hydrocarbon group or a substituted or unsubstituted 3- to 5-membered heterocyclic group having therein at least one heteroatom selected from a group consisting of N, O, S, and P, and Y.sub.R represents a residue remaining after removing the acyl group from the acylacetamide yellow dye-forming coupler, provided that R.sub.1 is not a hydrogen atom and does not bond to Q to form a ring, ##STR2## wherein R.sup.1 represents --CONR.sup.4 R.sup.5, --SO.sub.2 NR.sup.4 R.sup.5, --NHCOR.sup.
    Type: Grant
    Filed: March 11, 1992
    Date of Patent: March 15, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yoshio Ishii, Yasuhiro Yoshioka, Hidetoshi Kobayashi
  • Patent number: 5294531
    Abstract: A bicyclo[m.n.0]alkane-1-ylcarbonylacetamide-based yellow dye-forming coupler wherein m represents an integer of 2 to 5, n represents an integer of 1 to 3, the sum of m and n is an integer of 3 to 7, and 0 represents zero.
    Type: Grant
    Filed: September 16, 1992
    Date of Patent: March 15, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hidetoshi Kobayashi, Yasuhiro Yoshioka, Yoshio Shimura
  • Patent number: 5283166
    Abstract: An acylacetamide-type yellow dye-forming coupler. The acyl group of the coupler is a bicyclo[1.1.1]pentane-1-carbonyl group, a bicyclo[2.1.1]hexane-1-carbonyl group, a bicyclo[2.2.1.]heptane-1-carbonyl group, a bicyclo[2.2.2]octane-1-carbonyl group, a tricyclo[3.1.1.0.sup.3,6 ]heptane-6-carbonyl group, a tricyclo[3.3.0.0.sup.3,7 ]octane-1-carbonyl group, or a tricyclo[3.3.1.0.sup.3,7 ]nonane-3-carbonyl group.
    Type: Grant
    Filed: May 14, 1992
    Date of Patent: February 1, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hidetoshi Kobayashi, Yasuhiro Yoshioka, Yoshio Shimura
  • Patent number: 5273868
    Abstract: A silver halide color photographic material comprising a support having thereon at least one blue sensitive silver halide emulsion layer, at least one green sensitive silver halide emulsion layer and at least one red sensitive silver halide emulsion layer, wherein at least one type of acylacetamide type yellow coupler in which the acyl group represented by formula [I] indicated below is included in said blue sensitive silver halide emulsion layer and at least one type of magenta coupler represented by formula [M] indicated below is included in said green sensitive silver halide emulsion layer, ##STR1## wherein R.sub.1 represents a univalent group, Q represents a group of non-metal atoms which, together with C, is required to form a three to five membered hydrocarbon ring or a three to five membered heterocyclic ring which has within the ring at least one hetero atom selected from the group consisting of N, O, S and P, with the proviso with R.sub.
    Type: Grant
    Filed: November 15, 1991
    Date of Patent: December 28, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Mamoru Sakurazawa, Hidetoshi Kobayashi
  • Patent number: 5260177
    Abstract: A silver halide color photographic light-sensitive material comprises a novel cyan dye-forming coupler or a combination of a specific cyan dye-forming coupler with an .alpha.-pivaloylacetoanilide type yellow dye-forming coupler or a pyrazoloazole type magenta dye-forming coupler, the specific cyan dye-forming coupler being contained in the silver halide emulsion layer in the form of an emulsion of lipophilic fine particles obtained by mixing the coupler with at least one water-insoluble and organic solvent-soluble homo- or co-polymer to form a dispersion. The silver halide color photographic light-sensitive material is excellent in the reproduction of yellow, magenta and cyan colors and has low fog of cyan. Thus, the light-sensitive material can provide color images excellent in the fastness of the cyan color images.The cyan dye-forming coupler is represented by general formula (II): ##STR1## wherein R.sub.1 represents an aliphatic group, an aromatic group or a heterocyclic group; R.sub.
    Type: Grant
    Filed: May 18, 1992
    Date of Patent: November 9, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kozo Aoki, Michio Ono, Katsuyoshi Yamakawa, Shigeru Yamazaki, Kei Sakanoue, Hidetoshi Kobayashi
  • Patent number: 5258270
    Abstract: A silver halide color photographic material having on a support at least one cyan dye-forming coupler-containing silver halide emulsion layer, at least one magenta dye-forming coupler-containing silver halide emulsion layer and at least one yellow dye-forming coupler-containing silver halide emulsion layer, wherein the cyan dye-forming coupler is a 1-naphthol type coupler having a naphtol nucleus, in which a group represented by the following formula (I) binds directly to the 2-position of the naphthol nucleus, and the magenta dye-forming coupler is a 1H-pyrazolo[1,5-b]-1,2,4-triazole type coupler, ##STR1## wherein R.sup.1 represents a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, a cycloalkyl group, an aralkyl group, or an aryl group; R.sup.2 represents a substituent group; R.sup.3 and R.sup.4 each represents a hydrogen atom, an alkyl group, an aryl group, a halogen atom, an alkoxy group, or an aryloxy group; l represents an integer from 0 to 4; and m represents an integer from 0 to 4.
    Type: Grant
    Filed: October 4, 1991
    Date of Patent: November 2, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hidetoshi Kobayashi, Hiroo Takizawa, Yoshio Ishii
  • Patent number: 5250406
    Abstract: There is disclosed a silver halide color photographic material comprising a photosensitive silver halide emulsion layer that contains an acylacetamide yellow dye-forming coupler whose acyl group is represented by formula (Y-I) and a compound represented formula (I). ##STR1## wherein R.sub.1 represents a monovalent group, O represents a group of nonmetallic atoms required to form together with C a 3- to 5-membered hydrocarbon ring or a 3- to 5-membered heterocyclic ring that contains a hetero atom selected from the group consisting of N, O, S, and P, provided that R.sub.1 is not a hydrogen atom and it does not bond to Q to form a ring. ##STR2## wherein A represents an oxidation-reduction (redox) residue or its precursor, which is an atomic group that allows --Time).sub.
    Type: Grant
    Filed: October 7, 1991
    Date of Patent: October 5, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Mitsuru Yamamoto, Hidetoshi Kobayashi
  • Patent number: 5238790
    Abstract: A silver halide photographic light-sensitive material contains a dispersion in which at least one compound represented by formula (I) below and a photographic useful reagent, which is hard to solve in water, are dispersed together. (In formula (I), R.sub.1 and R.sub.2 independently represent amino having 0 to 32 carbon atoms, alkoxy having 1 to 32 carbon atoms, or aryloxy having 6 to 32 carbon atoms, R.sub.3 and R.sub.4 independently represent a group which can be substituted on a benzene ring, and l and m independently represent an integer of 0 to 4. R.sub.3 and/or R.sub.4 may be the same or different when l and/or m is 2 to 4. In a method of processing a silver halide photographic light-sensitive material, the silver halide photographic light-sensitive material is exposed imagewise and then developed with a color developer not essentially containing benzyl alcohol.
    Type: Grant
    Filed: December 19, 1991
    Date of Patent: August 24, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yoshio Shimura, Hidetoshi Kobayashi, Hideaki Naruse
  • Patent number: 5210011
    Abstract: A silver halide color photographic photosensitive material comprising a support having thereon a at least one silver halide emulsion layer, wherein at least one cyan dye forming coupler represented by the formula (I) indicated below ##STR1## wherein all the symbols are defined in the specification and at least one cyan dye forming coupler which can be represented by the formula (C) indicated below ##STR2## wherein all the symbols are defined in the specification are present in a layer on said support.
    Type: Grant
    Filed: December 11, 1990
    Date of Patent: May 11, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Jiro Tsukahara, Hidetoshi Kobayashi
  • Patent number: 5204211
    Abstract: An image receiving element for use in a peel-apart type silver salt diffusion transfer process comprising:(a) a support having a front side and a back side;(b) at least one layer which is a cellulose ester layer or a regenerated cellulose layer coated on the front side of the support;(c) an aliphatic acid ester of glycerol contained in at least one of the cellulose ester layer or the regenerated cellulose layer; and(d) a gelatin-containing layer coated on the back side of the support.
    Type: Grant
    Filed: August 14, 1991
    Date of Patent: April 20, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Ikutaro Horie, Hidetoshi Kobayashi
  • Patent number: 5200303
    Abstract: A light-sensitive silver halide material composed of a support having thereon at least one light-sensitive silver halide emulsion layer, at least one layer of the light-sensitive silver halide emulsion layer or an adjacent layer thereof containing an oil droplet dispersion in a hydrophilic binder, the oil droplets containing the combination of (a) a polymer insoluble in water and soluble in an organic solvent; (b) a high boiling point organic solvent having a viscosity at 25.degree. C. of at least 500 cp and a boiling point of at least 120.degree. C.; and (c) at least one coupler capable of forming a non-diffusible cyan dye by a coupling reaction with an oxidized form of a primary aromatic amine developing agent.
    Type: Grant
    Filed: February 1, 1991
    Date of Patent: April 6, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Osamu Takahashi, Yoshio Seoka, Hidetoshi Kobayashi, Tsumoru Ishii
  • Patent number: 5192651
    Abstract: The present invention relates to photographic photosensitive material comprising a support having thereon at least one silver halide emulsion layer. The photosensitive material contains at least one cyan dye forming coupler represented by formula (I) ##STR1## and at least one cyan dye forming coupler represented by formula (II) ##STR2## in proportions, respectively from 20 to 99 wt % and from 1 to 80 wt %, wherein all the symbols are defined in the specification.
    Type: Grant
    Filed: December 19, 1990
    Date of Patent: March 9, 1993
    Assignee: Fuji Photo Film Co. Ltd.
    Inventors: Jiro Tsukahara, Hidetoshi Kobayashi
  • Patent number: 5187055
    Abstract: A silver halide color photographic material having at least one silver halide emulsion layer on a support, said photographic material containing at least one coupler represented by the following general formula (I) in a constituent layer, ##STR1## wherein R.sub.1 and R.sub.2, which may be the same or different, each represents an alkyl, alkoxy, alkylthio, alkylsulfonyl, alkoxycarbonyl, alkoxysulfonyl, aryl, aryloxy, arylthio, arylsulfonyl and aryloxycarbonyl group; R.sub.3 and R.sub.4, which may be the same or different, each represents a group by which benzene can be substituted; Z represents nonmetal atoms necessary to form a 5- to 7-membered single or condensed hetero ring together with the nitrogen atom; and m and n each represents an integer of from 0 to 4, and when they are each a plural number, a plural R.sub.3 or a plural R.sub.4 may be the same or different.
    Type: Grant
    Filed: December 14, 1988
    Date of Patent: February 16, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hidetoshi Kobayashi, Yasuhiro Shimada, Seiji Ichijima, Yoshio Ishii
  • Patent number: H1248
    Abstract: A Silver halide color photographic materials comprising a support having thereon at least one silver halide emulsion layer, wherein said material contains (1) at least one type of compound which reacts with the oxidized product of a primary aromatic amine based developing agent and releases a bleach accelerating agent, and (2) at least one type of cyan dye forming coupler represented by general formula (A) below: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, T and l' are defined as in the specification.
    Type: Grant
    Filed: June 14, 1988
    Date of Patent: November 2, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kei Sakanoue, Hidetoshi Kobayashi