Patents by Inventor Shigeaki Otani

Shigeaki Otani 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: 5879869
    Abstract: A silver halide color photographic light-sensitive material which comprises a support having thereon photographic constituting layers comprising blue, green and red sensitive silver halide emulsion layers, and a light-insensitive hydrophilic colloidal layer, wherein the photographic constituting layers contain, in combination or separately, at least one compound represented by the following formula(1): ##STR1## wherein R.sup.1, R.sup.2, and R.sup.3 represent specific groups, and L.sup.1, L.sup.2, and L.sup.3 each independently represents methine; andat least one compound selected from the group consisting of the compounds represented by the following formulas (2) and (3):A.sup.1 .dbd.L--Q (2)A.sup.1 .dbd.L--A.sup.2 (3)wherein A.sup.1 or A.sup.2 each independently represents an acidic nucleus, Q represents aryl or a heterocyclic ring, and L represents methine. The light-insensitive hydrophlic colloidal layer exhibits antihalation effect.
    Type: Grant
    Filed: October 2, 1996
    Date of Patent: March 9, 1999
    Assignee: Fuji Photo Film Co., Ltd
    Inventors: Akira Kase, Yoshiharu Yabuki, Shigeaki Otani
  • Patent number: 5462847
    Abstract: A silver halide color photographic material is provided comprising at least one yellow-developable silver halide emulsion layer, at least one magenta-developable silver halide emulsion layer and at least one cyan-developable silver halide emulsion layer on a support, characterized in that said at least one cyan-developable silver halide emulsion layer comprises at least one cyan dye-forming coupler represented by the following general formula (Ia) and silver bromochloride or silver chloride emulsion grains substantially free of silver iodide having a silver chloride content of 95 mol % or more spectrally sensitized with at least one sensitizing dye having a reduction potential of -1.27 V (vs. SCE) or lower: ##STR1## wherein Za represents --NH-- or --CH(R.sub.3)--; Zb and Zc each represents --C(R.sub.4).dbd. or --N.dbd.; R.sub.1, R.sub.2 and R.sub.3 each represents an electron withdrawing group having a Hammett's substituent constant .sigma..sub.p value of 0.20 or more, with the proviso that the sum of .sigma.
    Type: Grant
    Filed: June 2, 1993
    Date of Patent: October 31, 1995
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Shigeaki Otani
  • Patent number: 5462850
    Abstract: There is provided a silver halide photographic material which comprises silver chloride or silver chlorobromide substantially free from silver iodide. The silver halide photographic material is excellent in rapid processability, low in fogging, and high in sensitivity and contrast.
    Type: Grant
    Filed: February 6, 1995
    Date of Patent: October 31, 1995
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Masahiro Asami, Naoto Ohshima, Shigeaki Otani
  • Patent number: 5409806
    Abstract: There is disclosed a color photographic material and a method for forming a color image using the said photographic material. The color photographic material has at least three dye-forming coupler-containing layers and comprises a reflective support covered with a water-resistant resin composition containing a white pigment and a thermoplastic resin, an emulsion layer that has a silver chloride content of 95 mol % or more and contains silver chlorobromide grains or silver chloride grains containing specified metal ions, and the color photographic material being hardened by a specified compound.
    Type: Grant
    Filed: November 30, 1993
    Date of Patent: April 25, 1995
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Shigeaki Otani
  • Patent number: 5350665
    Abstract: A silver halide color photographic material comprising a reflective support having thereon a yellow dye image forming silver halide emulsion layer, a magenta dye image forming silver halide emulsion layer and a cyan dye image forming silver halide emulsion layer, wherein said yellow dye image forming layer, magenta dye image forming layer and cyan dye image forming layer exhibit a maximum spectral sensitivity in the range of 400 to 490 nm, 530 to 570 nm and 660 to 720 nm, respectively, said silver halide emulsion of said cyan dye image forming layer comprises a silver chloride, silver bromochloride or silver bromochloroiodide emulsion having a silver chloride content of 90 mol % or more with a maximum spectral sensitivity given by J-band absorption of a compound represented by the general formula (I), ##STR1## wherein the variables are described in the specification.
    Type: Grant
    Filed: November 29, 1991
    Date of Patent: September 27, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kazunori Hasebe, Shigeaki Otani, Yasuhiro Hayashi
  • Patent number: 5286617
    Abstract: A silver halide color photographicmaterial capable of providing an excellent rapid processing property and sharpness as well as forming little stain on a background after processing.
    Type: Grant
    Filed: June 10, 1992
    Date of Patent: February 15, 1994
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigeaki Otani, Shoji Ishiguro
  • Patent number: 5264332
    Abstract: There is disclosed a silver halide color photographic material containing a support having thereon three color-forming layers, which comprises, in said color-forming silver halide emulsion layers, high-silver-chloride grains, silver halide grains in the cyan color-forming layer being spectrally sensitized with a red-sensitive sensitizing dye having a prescribed reduction potential, and/or, in the cyan color-forming layer, an oil-soluble cyan coupler that cause coupling reaction with the oxidized product of an aromatic primary amine developing-agent to form a nondiffusible dye, a compound represented by formula (I) or (II), and a compound represented by formula (II) or (IV). ##STR1## wherein R.sub.1 and R.sub.3 each represent a hydrogen atom, an alkyl group, or a halogen atom, R.sub.2, R.sub.4, R.sub.5, R.sub.7, and R.sub.
    Type: Grant
    Filed: October 8, 1991
    Date of Patent: November 23, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigeaki Otani, Hiroyuki Yoneyama
  • Patent number: 5260176
    Abstract: A method of forming a color image on a silver halide color photographic light-sensitive material having at least one silver halide emulsion layer provided on a reflective support, which does not substantially contain silver iodide and which contains silver chlorobromide or silver chloride grains having a silver chloride content of at least 95 mol %, said grains containing at least one metal ion consisting of a group of ions of metals of Group VIII of the Periodic Table, transition metals of Group II of the Periodic Table, lead and thallium in an amount of at least 10.sup.-9 mol per mol of silver halide, comprising exposing said photographic material by means of a scanning exposure using an image signal formed by scanning an original image and thereafter continuously processing said photographic material with a color developer substantially not containing benzyl alcohol, wherein the amount of the replenisher to the developer is 200 ml or less per m.sup.2 of the photographic material processed thereby.
    Type: Grant
    Filed: January 8, 1992
    Date of Patent: November 9, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shigeaki Otani, Yoji Okazaki
  • Patent number: 5043256
    Abstract: A silver halide color photographic material having at least one silver halide emulsion layer containing substantially no silver iodide and comprising silver chloride or silver chlorobromide grains having an average silver chloride content of not less than 10 mol % and containing at least 10.sup.-9 mol (per mol of silver halide) of Group VIII metal ion of the Periodic Table, Group II transition metal ion of the Periodic Table, lead ion or thallium ion provided on a reflection type support, said silver halide emulsion layer contains at least one member of pyrazoloazole couplers represented by the following general formula (I) and said silver halide color photographic material contains at least one member of compounds represented by the following general formulas (II) and (III) and at least one member of compounds represented by the following general formula (IV) ##STR1## wherein Za and Zb, R.sub.1 and R.sub.2 and X.sub.1 are defined in the specification; at least one of R.sub.1 and R.sub.
    Type: Grant
    Filed: September 27, 1989
    Date of Patent: August 27, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Shigeaki Otani
  • Patent number: 4853321
    Abstract: A method of forming a color image and a silver halide color photographic material comprising a reflective support having thereon at least one light-sensitive layer containing at least one coupler which forms a dye upon a coupling reaction with an oxidation product of an aromatic primary amine color developing agent and a silver halide emulsion which contains at least 80% by mol of silver chloride and substantially no silver iodide the method comprising processing with a color developing solution which contains not more than 0.002 mol of a bromine ion per liter and substantially no benzyl alcohol for a development time of not more than 2 minutes and 30 seconds in the presence of at least one compound represented by the following formulae (I), (II), or (III), as defined in the specification.The method of forming a color image and the silver halide color photographic material according to the present invention enable rapid processing to be conducted while controlling the fog formation with high sensitivity.
    Type: Grant
    Filed: May 19, 1987
    Date of Patent: August 1, 1989
    Assignee: Fuji Photo Film, Co., Ltd.
    Inventors: Yasuhito Momoki, Masahiro Asami, Nobuo Sakai, Shigeaki Otani