Patents by Inventor Kozo Aoki

Kozo Aoki 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: 5096805
    Abstract: A silver halide color photographic material containing at least one silver halide emulsion and at least one kind of 5-pyrazolone couplers having the releasable group shown by following formula (I) at the coupling position and at least one kind of the compounds shown by following formula (II): ##STR1## wherein L.sub.1 and L.sub.2 each represents a methylene group or an ethylene group; l and m each represents 0 or 1; R.sub.1 represents a hydrogen atom, an alkyl group, an aryl group, or a heterocyclic group; R.sub.2 represents a group bonded to A by a carbon atom, an oxygen atom, a nitrogen atom or a sulfur atom; A represents a carbon atom or a sulfur atom; n represents 1 when A is a carbon atom, or 1 or 2 when A is a sulfur atom; B represents a carbon atom, an oxygen atom, a nitrogen atom, or a sulfur atom; and X represents an atomic group necessary for forming a ring; said R.sub.1 and R.sub.2 may combine with each other to form a ring; and when B is a carbon atom or a nitrogen atom, said B and R.sub.
    Type: Grant
    Filed: April 5, 1991
    Date of Patent: March 17, 1992
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kozo Aoki, Masakazu Morigaki
  • Patent number: 5084375
    Abstract: A color photographic light-sensitive material comprising a support having provided thereon a silver halide emulsion layer containing at least one each of cyan color image forming couplers represented by the following general formulae (I) and (II): ##STR1## and at least one compound represented by the formulae (III) or (IV): ##STR2## wherein all the symbols are defined in the specification.
    Type: Grant
    Filed: October 15, 1986
    Date of Patent: January 28, 1992
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Makoto Umemoto, Kozo Aoki
  • Patent number: 5037730
    Abstract: A silver halide photographic light-sensitive material comprising at least one type of cyan dye-forming coupler represented by formula (I) below and at least one type of difficulty water-soluble epoxy represented by formula (II) below: ##STR1## wherein R.sub.1 represents an alkyl group having at least 7 carbon atoms, R.sub.2 represents an alkyl group with 2 to 15 carbon atoms, L represents a simple linkage or a bivalent linking group, Z represents a hydrogen atom, or a group or atom which can be released at the time of the coupling with the developing agent, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 each represents a hydrogen atom, an aliphatic group, an aliphatic oxycarbonyl group, an aromatic oxycarbonyl group or a carbamoyl group, provided that R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are not all hydrogen atoms, and the total number of carbon atoms thereof is from 8 to 60, and in formula (II), a 5- to 7-membered ring may be formed with R.sub.3 and R.sub.4 or R.sub.3 and R.sub.5, respectively.
    Type: Grant
    Filed: December 6, 1990
    Date of Patent: August 6, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kozo Aoki, Osamu Takahashi
  • Patent number: 5009989
    Abstract: A silver halide photographic material which contains, on a support, a combination of at least one cyan dye-forming coupler represented by the following formula (I) and at least one compound selected from among those represented by the following formulae (II) and (III), whereby achieving enhancement of keeping quality of the developed cyan color dye: ##STR1## wherein R.sub.1 represents an aliphatic group, an aromatic group or a heterocyclic group; R.sub.2 representing an alkyl group containing from 2 to 15 carbon atoms; Z represents a hydrogen atom, or a group or an atom capable of splitting off upon coupling with a developing agent; L.sub.1 and L.sub.2 each represents a divalent to a tetravalent aliphatic group; R.sub.3 and R.sub.4 each represents an aliphatic group, an aromatic group, or a heterocyclic group; and n and m each represents an integer of from 2 to 4, and therein the n R.sub.3 's and m R.sub.4 's, respectively, may be the same or different, and when m represents 2, L.sub.
    Type: Grant
    Filed: September 19, 1988
    Date of Patent: April 23, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kozo Aoki, Osamu Takahashi
  • Patent number: 4971898
    Abstract: A silver halide color photographic light-sensitive material comprising a support having provided thereon at least one silver halide emulsion layer, wherein the silver halide color photographic material contains at least one cyan coupler represented by the general formula (I) described below and at least one cyan coupler represented by the general formula (II) described below ##STR1## wherein R.sub.1 represents an alkyl group having at least 8 carbon atoms; R.sub.2 and R.sub.6 each represents an alkyl group having from 2 to 4 carbon atoms; R.sub.3 represents an alkyl group, an aryl group, a halogen atom, an alkoxy group, a hydroxy group, an acyloxy group or an alkoxycarbonyloxy group; n represents an integer from of 1 to 5, when n is 2 or more, two or more R.sub.3 's are the same or different; R.sub.4 represents a hydrogen atom or an alkyl group having not more than 16 carbon atoms; R.sub.
    Type: Grant
    Filed: March 10, 1989
    Date of Patent: November 20, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kozo Aoki, Osamu Takahashi
  • Patent number: 4945031
    Abstract: An image-forming process, which comprises subjecting a multilayer silver halide color photographic material containing, in an oil droplet dispersion in a light-sensitive layer provided on a support, at least one of the diffusion-resistant oil-soluble couplers capable of coupling with an oxidation product of an aromatic primary amine developing agent to form a substantially non-diffusible cyan dye represented by the following formula (I) and at least one member selected from the compounds represented by the following formulae (II) and (III), to imagewise exposure and color development, and then processing the multilayer silver halide photographic material with a bleaching or bleach-fixing solution having a pH of 6.3 or less: ##STR1## wherein: Y represents --NHCO-- or --CONH--;R.sub.1 represents an aliphatic group, an aromatic group, a heterocyclic group or an amino group;X represents a hydrogen atom, a halogen atom, an aliphatic group, an alkoxy group or an acylamino group;R.sub.
    Type: Grant
    Filed: June 20, 1988
    Date of Patent: July 31, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Minoru Sakai, Osamu Takahashi, Kozo Aoki
  • Patent number: 4929538
    Abstract: A novel silver halide color photographic material is provided, containing at least one coupler represented by formula (C-I) and at least one compound represented by formula (A-I) or (A-II) ##STR1## wherein Q.sub.1 represents an atomic group containing at least one nitrogen atom required to form a 5- or more membered nitrogen-containing heterocyclic ring together with the carbon atoms to which it is bonded; Z.sub.1 represents a hydrogen atom or a coupling-off group; R.sub.Cl represents an acyl or sulfonyl group; and R.sub.C2 represents a hydrogen atom or a C.sub.1-8 aliphatic group, or the substituents for R.sub.Cl, R.sub.C2, Z.sub.1, or Q.sub.1 form a dimeric or polymeric coupler; ##STR2## wherein R represents a hydrogen atom, an aliphatic group, an aromatic group, a heterocyclic group, or a hydrolyzable protective group; R.sub.1, R.sub.2, R.sub.3, R.sub.4, and R.sub.
    Type: Grant
    Filed: September 29, 1987
    Date of Patent: May 29, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Masakazu Morigaki, Kozo Aoki
  • Patent number: 4904575
    Abstract: A silver halide color photographic material comprising a support having coated thereon at least one silver halide emulsion layer, the silver halide color photographic material containing a photographic cyan dye forming coupler represented by the following general formula (I): ##STR1## wherein R.sub.1 represents an aliphatic group, an aromatic group, heterocyclic group or a substituted amino group; R.sub.2 and R.sub.3, which may be the same or different, each represents an aliphatic group, an aromatic group or a heterocyclic group, or R.sub.2 and R.sub.3 may combine with each other to form a ring; and X represents a group capable of beiing released upon an oxidative coupling with a developing agent (including a hydrogen atom).
    Type: Grant
    Filed: July 8, 1988
    Date of Patent: February 27, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Michio Ono, Minoru Sakai, Kozo Aoki
  • Patent number: 4898812
    Abstract: A silver halide color photographic material comprising a support having thereon at least one silver halide emulsion layer, said emulsion layer containing at least one cyan dye forming coupler represented by the general formula (I): ##STR1## wherein, Q.sub.1 contains at least one nitrogen atom and represents a group of atoms that are combined to form, together with a carbon atoms attached thereto a 5- or more membered nitrogen-containing heterocyclic ring;Z.sub.1 represents a hydrogen atom or a group that can be released in a coupling reaction with the oxidation product of a color developing agent;R represents an acyl group or a sulfonyl group; andR' represents a hydrogen atom or an aliphatic group having 1 to 8 carbon atoms which may be substituted with one or more substituents; anda dimer coupler or a polymer coupler may be formed through R, R', Z.sub.1 or Q.sub.1 ;and at least one color development accelerator.The silver halide color photographic material has increased D.sub.max and sensitivity.
    Type: Grant
    Filed: August 7, 1987
    Date of Patent: February 6, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kozo Aoki, Nobuo Furutachi
  • Patent number: 4894320
    Abstract: A method of processing an imagewise exposed silver halide color photographic material comprising developing the material with a color developing solution, and then processing the material with a solution having a bleaching ability, wherein the processing solution having a bleaching ability contains a ferric complex salt comprising, as a complexing agent, an aromatic compound having at least one group represented by the following general formula (I): ##STR1## wherein X represents a hydrogen atom or an organic or inorganic cation, A represents a single bond or a divalent linking group, and R represents a hydrogen atom, an aliphatic group, an aromatic group, a heterocyclic ring group, an acyl group, a sulfonyl group, A or --CH.sub.2 PO.sub.3 X.sub.2.
    Type: Grant
    Filed: September 25, 1987
    Date of Patent: January 16, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shinji Ueda, Masakazu Morigaki, Kozo Aoki
  • Patent number: 4892810
    Abstract: A silver halide color photographic light-sensitive material is described, the light-sensitive material containing a cyan dye forming coupler represented by the following general formula (I): ##STR1## wherein R.sub.1 represents an alkyl group having 2 to 15 carbon atoms, R.sub.2 and R.sub.3 represent each a hydrogen atom or an alkyl group, R.sub.4 represents a substituted aryl group which is substituted by a group other than an aryl group or an aralkyl group, X represents a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group, Z represents a hydrogen atom or a group capable of release by an oxidation coupling reaction with the developing agent, n represents an integer of 1 to 4, and the total number of carbon atoms in the alkyl groups contained in R.sub.1, R.sub.2, R.sub.3, R.sub.4, X and Z is 8 or more, and the total number of carbon atoms in the alkyl groups substituted in R.sub.1 and R.sub.4, in the case that n is 1, is 11 or less.
    Type: Grant
    Filed: December 22, 1987
    Date of Patent: January 9, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kozo Aoki, Michio Ono, Naoki Saito
  • Patent number: 4840878
    Abstract: A method for forming a color image is disclosed, which comprises imagewise exposing a multi-layer silver halide color photographic material comprising a reflective support having provided thereon at least three silver halide emulsion layers different in color sensitivity, each of which separately contains at least one coupler selected from a specific combination of cyan, magenta, and yellow couplers, and processing the exposed material with a color developing solution containing substantially no benzyl alcohol for a period of not more than 2 minutes and a half. A color image excellent in color reproducibility and preservability can be obtained rapidly without using benzyl alcohol.
    Type: Grant
    Filed: September 30, 1988
    Date of Patent: June 20, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takeshi Hirose, Nobuo Furutachi, Kozo Aoki, Kiyoshi Nakazyo, Genichi Furusawa
  • Patent number: 4770988
    Abstract: A silver halide color photographic material containing the combination of cyan couplers of formula (I) and cyan couplers of formula (II). The photographic material provides a dye image excellent in fastness and color reproducibility and free from white background stains. The photographic material undergoes substantially no reduction in density even when processed with a bleaching solution with weak oxidizing capacity or a fatigued bleaching solution.
    Type: Grant
    Filed: July 24, 1987
    Date of Patent: September 13, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kozo Aoki, Minoru Sakai
  • Patent number: 4748100
    Abstract: A silver halide color photographic light-sensitive material comprising a support having formed thereon at least one red-sensitive emulsion layer, at least one green-sensitive emulsion layer, and at least one blue-sensitive emulsion layer is disclosed. The material cotains a novel combination of cyan, magenta, and yellow couplers and has improved color forming properties, color reproducibility, and image preservability.
    Type: Grant
    Filed: September 11, 1987
    Date of Patent: May 31, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Makoto Umemoto, Kozo Aoki
  • Patent number: 4748107
    Abstract: A silver halide color photographic light-sensitive material comprising a support having formed thereon at least one red-sensitive emulsion layer, at least one green-sensitive emulsion layer, and at least one blue-sensitive emulsion layer is disclosed. The material contains a novel combination of cyan, magenta, and yellow couplers and has improved color forming properties, color reproducibility, and image preservability.
    Type: Grant
    Filed: September 5, 1986
    Date of Patent: May 31, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Makoto Umemoto, Kozo Aoki
  • Patent number: 4746602
    Abstract: A silver halide color photographic material is disclosed, comprising a support having provided thereon at least one silver halide emulsion layer containing a cyan-dye-forming coupler represented by formula (I) ##STR1## wherein Y represents an atomic group forming an at least 7-membered nitrogen-containing heterocyclic ring containing at least one--NHCO-- group; Z represents a hydrogen atom or a group releasable upon coupling with an oxidation product of a color developing agent; R represents an aliphatic group, an aromatic group, a heterocyclic group, or a substituted amino group, or any of R, Z and Y form a dimer or higher polymer.The material forms a dye image excellent in fastness and color reproducibility, and free from white background stains.
    Type: Grant
    Filed: April 30, 1987
    Date of Patent: May 24, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Michio Ono, Kozo Aoki
  • Patent number: 4690889
    Abstract: A silver halide color photographic light-sensitive material containing a specific naphthol cyan dye forming coupler is disclosed. Dye images formed by this coupler are excellent in fastness to heat and light and in sharpness, and are free from adverse influences of a bleaching solution having weak oxidative activity or a fatigued bleaching solution.
    Type: Grant
    Filed: May 10, 1985
    Date of Patent: September 1, 1987
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Naoki Saito, Kozo Aoki, Yukio Yokota
  • Patent number: 4686177
    Abstract: A silver halide color photographic material having excellent color fastness against light, heat and heat with humidity, particularly against light irradiation, containing a cyan coupler of the general formula (I): ##STR1## wherein R represents an unsubstituted linear or branched aliphatic group or a linear or branched aliphatic group substituted with one or more substituents selected from a chlorine atom, an alkoxy group, an alkylthio group, an arylthio group, an alkylsulfonyl group, an arylsulfonyl group, a sulfonamido group, an acylamino group, an alkyloxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, an alkylcarbonyloxy group, an arylcarbonyloxy group, a carboxyl group and a hydroxyl group; R.sub.
    Type: Grant
    Filed: July 31, 1985
    Date of Patent: August 11, 1987
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kozo Aoki, Michio Ono, Naoki Saito, Makoto Umemoto
  • Patent number: 4622287
    Abstract: A silver halide color photographic light-sensitive material comprising a support and red-sensitive, green-sensitive and blue-sensitive light-sensitive layers formed on the support. The light-sensitive layers separately contain a coupler of formula (I), a coupler of formula (II) or (III), and a coupler of formula (IV). ##STR1## This novel combination of couplers leads to good color formability, improved color reproducibility, improved image preservability and good color balance.
    Type: Grant
    Filed: April 26, 1985
    Date of Patent: November 11, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Makoto Umemoto, Kozo Aoki
  • Patent number: 4587210
    Abstract: A color photographic silver halide light-sensitive material is described, characterized by containing at least one of the compounds represented by the general formula (I) and their precursors. ##STR1## wherein R represents ##STR2## (wherein R.sub.1 and R.sub.2 are each a hydrogen atom or an alkyl group and may combine with R.sub.3 to form a ring having 5 to 10 carbon atoms, provided that R.sub.1 and R.sub.2 are not hydrogen atoms at the same time, R.sub.3 is a substituted or unsubstituted aryl group, and n is an integer of 1 to 4), and R' has 1 to 20 carbon atoms and represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, or a substituent defined by R as defined above). This light-sensitive material provides color images which are stabilized, i.e., freed of fading and the discoloration of the white ground.
    Type: Grant
    Filed: March 30, 1984
    Date of Patent: May 6, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Michio Ono, Masakazu Morigaki, Takayoshi Kamio, Kozo Aoki, Kazuhiko Furuya