Patents by Inventor Yasushi Hattori

Yasushi Hattori 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: 7394091
    Abstract: There is provided composite nano-particles comprising nano-crystal particles dispersed stably and individually in suspension in high concentration without mutual aggregation of the nano-particles. A determined amount of pure water or deionized water is poured into a reactor, into which is introduced nitrogen gas at rate of 300 cm3/min for a given time while agitating with a stirrer to remove dissolved oxygen in the pure water, allowing to stand in an atmosphere of nitrogen. Next, the inside of the reactor is maintained in an atmosphere of nitrogen and sodium citrate as a dispersion-stabilizing agent, an aqueous solution of MPS as a surface-modifying agent, an anion aqueous solution for co-precipitation as a nano-crystal and a cation aqueous solution are added, in that order. Then, an aqueous solution of sodium silicate is added to the reactor, which is then allowed to stand in the dark place in an atmosphere of nitrogen after agitation.
    Type: Grant
    Filed: July 16, 2003
    Date of Patent: July 1, 2008
    Assignee: Keio University Faculty of Science and Technology
    Inventors: Tetsuhiko Isobe, Yasushi Hattori, Shigeo Itoh, Hisamitsu Takahashi
  • Patent number: 7384449
    Abstract: Ferromagnetic nanoparticles which are produced by reducing, in the presence of a polymer, two or more metals having different reduction potentials twice or more, using two or more reducing agents having different reduction potentials, a material coated with a dispersion of ferromagnetic nanoparticles in which the ferromagnetic nanoparticles are dispersed, and a magnetic recording medium which has a magnetic layer consisting of the material. The ferromagnetic nanoparticles having a holding power Hc of 95.5 kA/m or more, the material coated with the dispersion of ferromagnetic nanoparticles having excellent industrial coatability, and the magnetic recording medium using the dispersion are provided.
    Type: Grant
    Filed: April 25, 2006
    Date of Patent: June 10, 2008
    Assignee: FUJIFILM Corporation
    Inventors: Yasushi Hattori, Kouichi Masaki, Koukichi Waki
  • Patent number: 7381239
    Abstract: Disclosed are alloy nano-particles having a fluctuation coefficient of particle size of 20% or less and a fluctuation coefficient of composition of 20% or less. The alloy nano-particles have a low transformation point and hardly aggregate and which can form a flat magnetic film having high coercive force.
    Type: Grant
    Filed: June 25, 2004
    Date of Patent: June 3, 2008
    Assignee: Fujifilm Corporation
    Inventors: Koukichi Waki, Genichi Furusawa, Yasushi Hattori
  • Patent number: 7335393
    Abstract: The present invention relates to a method of producing a magnetic particle including forming a layer containing an alloy particle that can form CuAu type or Cu3Au type hard magnetic order alloy phase on a support, oxidizing the layer, and annealing the layer in non-oxidizing atmosphere. The invention also relates to a method of producing a magnetic particle including producing an alloy particle that can form hard magnetic order alloy phase, oxidizing the alloy particle, and annealing the particle in non-oxidizing atmosphere, and a magnetic particle produced by the foregoing production method. Further, the invention relates to a magnetic recording medium comprising a magnetic layer containing a magnetic particle and a method of producing a magnetic recording medium including forming a layer containing an alloy that can form the foregoing hard magnetic order alloy phase, oxidizing the layer, and annealing the layer in non-oxidizing atmosphere.
    Type: Grant
    Filed: July 22, 2004
    Date of Patent: February 26, 2008
    Assignee: FUJIFILM Corporation
    Inventors: Yasushi Hattori, Koukichi Waki, Keizo Ogawa
  • Publication number: 20080017831
    Abstract: A europium-activated alkaline earth orthosilicate luminescent material is provided, which includes a compound having a composition represented by a following formula 1: (Srx Bay Caz Euw)2SiO4??formula 1 wherein, x, y, z and w satisfy following relational expressions 2, and 4 to 7, and are values satisfying the expression 3 when a, b, c and d are assumed to be 573, 467, 623 and 736, respectively: x+y+z+w=1??expression 2 600?ax+by+cz+dw??expression 3 0?x/(1?w)?0.95??expression 4 0?y/(1?w)?0.4??expression 5 0<z/(1?w)?0.95??expression 6 0.02?w?0.2??expression 7 the luminescent material shows an emission band having a peak wavelength of 600 nm or more when the luminescent material is excited by ultraviolet radiation having a wavelength of 254 nm.
    Type: Application
    Filed: July 18, 2007
    Publication date: January 24, 2008
    Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA LIGHTING & TECHNOLOGY CORPORATION
    Inventors: Masaaki Tamatani, Hisayo Uetake, Ryosuke Hiramatsu, Kazuaki Ootsuka, Yasushi Hattori, Naomi Shida
  • Publication number: 20080006838
    Abstract: A semiconductor light-emitting element including a semiconductor substrate having a first surface and second surface faced on the opposite side of the first surface, the semiconductor substrate having a recessed portion formed in the first surface, and the recessed portion having a V-shaped cross-section, a reflecting layer formed on an inner surface of the recessed portion, a first electrode formed on the reflecting layer, a light-emitting layer formed on the second surface, and a second electrode formed on the light-emitting layer.
    Type: Application
    Filed: March 21, 2007
    Publication date: January 10, 2008
    Inventors: Yasushi Hattori, Shinya Nunoue, Shinji Saito, Genichi Hatakoshi
  • Publication number: 20070231610
    Abstract: A magnetic recording medium including a support having thereon a magnetic layer and a non-magnetic layer in this order, the magnetic layer being formed by applying and drying a magnetic nanoparticle dispersion liquid in which magnetic nanoparticles having a number average particle diameter of 20 nm or less are dispersed, applying the non-magnetic layer onto the magnetic layer, fixing the magnetic nanoparticles, and carrying out annealing for ferromagnetization, and the non-magnetic layer containing a gelatinous composition formed by gelating at least one selected from hydrolysates of the silane compound represented by (R10)m—Si(X)4-m and partial condensates thereof, wherein R10 represents a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group; X represents a hydroxy group or hydrolyzable group; and m represents an integer from 1 to 3.
    Type: Application
    Filed: March 29, 2007
    Publication date: October 4, 2007
    Applicant: FUJIFILM Corporation
    Inventors: Koukichi Waki, Junichi Yamanouchi, Takahiro Ishizuka, Yasushi Hattori
  • Publication number: 20070228390
    Abstract: A light-emitting device is provided, which includes a substrate having a plane surface, a semiconductor light-emitting element mounted on the plane surface of the substrate and which emits light in a range from ultraviolet ray to visible light, a first light transmissible layer formed above the substrate and covering the semiconductor light-emitting element, a phosphor layer formed above the first light transmissible layer and containing phosphor particles and matrix, and a second light transmissible layer formed above the phosphor layer and contacting with the plane surface of the substrate. The surface of the phosphor layer has projections reflecting shapes of the phosphor particles.
    Type: Application
    Filed: January 29, 2007
    Publication date: October 4, 2007
    Inventors: Yasushi HATTORI, Shinya Nunoue, Genichi Hatakoshi, Shinji Saito, Naomi Shida, Masahiro Yamamoto
  • Patent number: 7244287
    Abstract: The present invention relates to a method of producing a magnetic particle including forming a layer containing an alloy particle that can form a CuAu-type or Cu3Au-type hard magnetic ordered alloy phase on a support, oxidizing the layer, and annealing the layer in a non-oxidizing atmosphere. The invention also relates to a method of producing a magnetic particle including producing an alloy particle that can form a hard magnetic ordered alloy phase, oxidizing the alloy particle, and annealing the particle in a non-oxidizing atmosphere, and a magnetic particle produced by the foregoing production method. Further, the invention relates to a magnetic recording medium comprising a magnetic layer containing a magnetic particle and a method of producing a magnetic recording medium including forming a layer containing an alloy that can form the foregoing hard magnetic ordered alloy phase, oxidizing the layer, and annealing the layer in a non-oxidizing atmosphere.
    Type: Grant
    Filed: July 22, 2004
    Date of Patent: July 17, 2007
    Assignee: Fujifilm Corporation
    Inventors: Yasushi Hattori, Koukichi Waki, Keizo Ogawa
  • Publication number: 20070138484
    Abstract: A light-emitting device is provided, which includes a substrate, a light-emitting element configured to emit light having a first wavelength, the light-emitting element having a pair of electrodes and being formed above the substrate, a metal layer interposed between the substrate and the light-emitting element and having a planar configuration, and a wavelength converting layer formed on the metal layer. The periphery of the metal layer is at least partially constituted by a plurality of projected portions and a plurality of recessed portions. The plurality of projected portions locates outside of the light-emitting element. The wavelength converting layer absorbs at least part of the light emitted from the light-emitting element and converts the first wavelength, thereby light having a second wavelength differing in wavelength from the first wavelength is emitted.
    Type: Application
    Filed: November 20, 2006
    Publication date: June 21, 2007
    Inventors: Masahiro Yamamoto, Yasushi Hattori, Naomi Shida, Kei Kaneko, Genichi Hatakoshi
  • Publication number: 20070013304
    Abstract: A light-emitting device is provided, which includes a supporting member, a light-emitting element disposed on the supporting member to emit a light, the light-emitting element having a semiconductor substrate and a polygonal top surface, an electrode pad formed on the top surface of the light-emitting element, a first lead electrode formed on the supporting member, a conductive wire connecting the electrode pad with the first lead electrode, the conductive wire being arranged to pass over one of corners of the polygonal top surface of the light-emitting element and along a ridge formed contiguous to the one of corners and corresponding to a boundary between neighboring side surfaces of the light-emitting element, and a fluorescent layer containing a light-transmitting member and a fluorescent substance.
    Type: Application
    Filed: February 17, 2006
    Publication date: January 18, 2007
    Inventors: Kei Kaneko, Naomi Shida, Masahiro Yamamoto, Yasushi Hattori
  • Publication number: 20070001568
    Abstract: A light-emitting device is provided, which includes a supporting member, a light-emitting element disposed on the supporting member to emit a light, and a fluorescent layer formed on the light-emitting element and having a thickness ranging from 80 to 240 ?m, the fluorescent layer containing a light-transmitting member and a fluorescent substance having a particle diameter ranging from 20 to 45 ?m at a concentration of 40 to 60 wt %.
    Type: Application
    Filed: February 7, 2006
    Publication date: January 4, 2007
    Inventors: Kei Kaneko, Naomi Shida, Masahiro Yamamoto, Yasushi Hattori
  • Publication number: 20060291246
    Abstract: A semiconductor light emitting element includes a semiconductor light emitting element emitting light beams in ultraviolet ranges and visible ranges, and a fluorescent element absorbing the light beams from the semiconductor light emitting element and outputting visible light beams in a light taking-out direction different from a light emitting direction. The light beams emitted from the light emitting element is absorbed within the semiconductor light emitting device.
    Type: Application
    Filed: November 28, 2005
    Publication date: December 28, 2006
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yasushi Hattori, Shinji Saito, Shinya Nunoue, Masahiro Yamamoto, Naomi Shida, Kei Kaneko, Genichi Hatakoshi
  • Publication number: 20060283290
    Abstract: A method of manufacturing magnetic particles, the method comprising synthesizing iron particles in a liquid phase, nitriding the iron particles, adjusting the average particle diameter to 5 to 25 nm, and making the iron particles substantially spherical. Also provided are magnetic particles and magnetic recording media.
    Type: Application
    Filed: June 20, 2006
    Publication date: December 21, 2006
    Inventors: Yasushi Hattori, Koukichi Waki
  • Publication number: 20060234417
    Abstract: There is provided composite nano-particles comprising nano-crystal particles dispersed stably and individually in suspension in high concentration without mutual aggregation of the nano-particles. A determined amount of pure water or deionized water is poured into a reactor, into which is introduced nitrogen gas at rate of 300 cm3/min for a given time while agitating with a stirrer to remove dissolved oxygen in the pure water, allowing to stand in an atmosphere of nitrogen. Next, the inside of the reactor is maintained in an atmosphere of nitrogen and sodium citrate as a dispersion-stabilizing agent, an aqueous solution of MPS as a surface-modifying agent, an anion aqueous solution for co-precipitation as a nano-crystal and a cation aqueous solution are added, in that order. Then, an aqueous solution of sodium silicate is added to the reactor, which is then allowed to stand in the dark place in an atmosphere of nitrogen after agitation.
    Type: Application
    Filed: July 16, 2003
    Publication date: October 19, 2006
    Inventors: Tetsuhiko Isobe, Yasushi Hattori, Shigeo Itoh, Hisamitsu Takahashi
  • Patent number: 7118816
    Abstract: The present invention provides a magnetic recording medium comprising a support and a magnetic layer comprising a CuAu type or Cu3Au type magnetically hard ordered alloy phase, wherein a center line average roughness of a magnetic layer surface is 0.1 to 5 nm at a cut-off value of 0.25 mm, and a magnetic recording medium comprising a support and a magnetic layer containing, in a nonmagnetic metal oxide matrix, metal nanoparticles having a CuAu type or Cu3Au type magnetically hard ordered alloy phase.
    Type: Grant
    Filed: April 24, 2003
    Date of Patent: October 10, 2006
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Koukichi Waki, Yasushi Hattori
  • Patent number: 7108927
    Abstract: The present invention relates to a magnetic recording medium comprising a magnetic layer on at least one side of a nonmagnetic substrate, the magnetic layer containing magnetic particles of a CuAu type or Cu3Au type ferromagnetic ordered phase, wherein a conductive layer is provided on at least one side of the nonmagnetic substrate.
    Type: Grant
    Filed: October 29, 2003
    Date of Patent: September 19, 2006
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yasushi Hattori, Koukichi Waki
  • Publication number: 20060194039
    Abstract: Ferromagnetic nanoparticles which are produced by reducing, in the presence of a polymer, two or more metals having different reduction potentials twice or more, using two or more reducing agents having different reduction potentials, a material coated with a dispersion of ferromagnetic nanoparticles in which the ferromagnetic nanoparticles are dispersed, and a magnetic recording medium which has a magnetic layer consisting of the material. The ferromagnetic nanoparticles having a holding power Hc of 95.5 kA/m or more, the material coated with the dispersion of ferromagnetic nanoparticles having excellent industrial coatability, and the magnetic recording medium using the dispersion are provided.
    Type: Application
    Filed: April 25, 2006
    Publication date: August 31, 2006
    Inventors: Yasushi Hattori, Kouichi Masaki, Koukichi Waki
  • Patent number: 7066978
    Abstract: A method of producing a nanoparticle, the method comprising: a reducing step of adding an reverse micelle solution (II) obtained by mixing a water-insoluble organic solvent containing a surfactant with an aqueous metal salt solution to an reverse micelle solution (I) obtained by mixing a water-insoluble organic solvent containing a surfactant with an aqueous reducing agent solution, to carry out a reducing reaction; and a maturing step of raising the temperature of the reduced mixture to mature the reduced mixture is provided. A method of producing a plural type alloy nanoparticle, the method comprising producing a nanoparticle made of a plural type alloy through a reducing step of mixing one or more reverse micelle solutions (I) containing a metal salt with an reverse micelle solution (II) containing a reducing agent to carry out reducing treatment and a maturing step of carrying out maturing treatment is also provided.
    Type: Grant
    Filed: February 19, 2003
    Date of Patent: June 27, 2006
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Koukichi Waki, Yasushi Hattori
  • Patent number: 7067199
    Abstract: The present invention relates to a method of producing a magnetic particle including forming a layer containing an alloy particle that can form a CuAu-type or Cu3Au-type hard magnetic ordered alloy phase on a support, oxidizing the layer, and annealing the layer in a non-oxidizing atmosphere. The invention also relates to a method of producing a magnetic particle including producing an alloy particle that can form a hard magnetic ordered alloy phase, oxidizing the alloy particle, and annealing the particle in a non-oxidizing atmosphere, and a magnetic particle produced by the foregoing production method. Further, the invention relates to a magnetic recording medium comprising a magnetic layer containing a magnetic particle and a method of producing a magnetic recording medium including forming a layer containing an alloy that can form the foregoing hard magnetic ordered alloy phase, oxidizing the layer, and annealing the layer in a non-oxidizing atmosphere.
    Type: Grant
    Filed: July 22, 2004
    Date of Patent: June 27, 2006
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yasushi Hattori, Koukichi Waki, Keizo Ogawa