Patents by Inventor Yoshihiro Akasaka

Yoshihiro Akasaka 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).

  • Publication number: 20130081678
    Abstract: According to one embodiment, a conductive material includes a carbon substance and a metallic substance mixed with and/or laminated to the carbon substance. The carbon substance has at least one dimension of 200 nm or less. The carbon substance includes a graphene selected from single-layered graphene and multi-layered graphene, a part of carbon atoms constituting the graphene is substituted with a nitrogen atom. The metallic substance includes at least one of a metallic particle and a metallic wire.
    Type: Application
    Filed: September 24, 2012
    Publication date: April 4, 2013
    Inventors: Katsuyuki NAITO, Norihiro YOSHINAGA, Yoshihiko NAKANO, Yoshihiro AKASAKA, Shigeru MATAKE
  • Publication number: 20130078549
    Abstract: According to one embodiment, a catalyst-supporting substrate comprises a substrate and a catalyst layer including a plurality of pores, the catalyst layer being supported on the substrate. The average diameter of the section of the pore when the catalyst is cut in the thickness direction of the thickness is 5 nm to 400 nm, and the long-side to short-side ratio of the pore on the section is 1:1 to 10:1 in average.
    Type: Application
    Filed: September 25, 2012
    Publication date: March 28, 2013
    Inventors: Taishi FUKAZAWA, Wu MEl, Yoshihiro AKASAKA, Norihiro YOSHINAGA
  • Publication number: 20130078550
    Abstract: According to one embodiment, there is provided a catalyst layer containing a catalyst material. The catalyst layer satisfying requirements below: a porosity of 20 to 90% by vol; and a relation R1?R0×1.2. In the above inequality, R1 represents an alignment ratio of the catalyst layer and R0 represents an alignment ratio of the catalyst material in powder form having a random crystalline plane distribution, and each of the alignment ratios is calculated from a X-ray diffraction spectrum having a diffraction angle 2? range from 10 to 90 degree measured using Cu-K?-rays.
    Type: Application
    Filed: September 27, 2012
    Publication date: March 28, 2013
    Inventors: Wu Mei, Shigeru Matake, Taishi Fukazawa, Yoshihiro Akasaka, Katsuyuki Naito
  • Patent number: 8394877
    Abstract: A pattern forming material contains a block copolymer or graft copolymer and forms a structure having micro polymer phases, in which, with respect to at least two polymer chains among polymer chains constituting the block copolymer or graft copolymer, the ratio between N/(Nc?No) values of monomer units constituting respective polymer chains is 1.4 or more, where N represents total number of atoms in the monomer unit, Nc represents the number of carbon atoms in the monomer unit, No represents the number of oxygen atoms in the monomer unit.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: March 12, 2013
    Assignee: Kabushika Kaisha Toshiba
    Inventors: Koji Asakawa, Toshiro Hiraoka, Yoshihiro Akasaka, Yasuyuki Hotta
  • Publication number: 20120251915
    Abstract: A catalyst layer includes a layered structure. The layered structure is laminated with sheet-like unit catalysts and pore layers. The sheet-like unit catalysts have mean thicknesses of 4 to 30 nm. The pore layers are sandwiched between the sheet-like unit catalysts.
    Type: Application
    Filed: March 15, 2012
    Publication date: October 4, 2012
    Inventors: Wu MEI, Taishi Fukazawa, Yoshihiro Akasaka
  • Publication number: 20120241315
    Abstract: An electrolysis device of an embodiment includes: an anode, a cathode having a nitrogen-containing carbon alloy catalyst, and an electrolysis cell having a membrane electrode assembly composed of an electrolyte present between the anode and the cathode so that voltage is applied to the anode and the cathode, wherein the electrolyte is any one of acidic, neutral, or alkali, water is produced by the electrolysis device at the cathode, when the electrolyte is acidic, and hydroxide ion is produced by the electrolysis device at the anode, when the electrolyte is neutral or alkali.
    Type: Application
    Filed: February 29, 2012
    Publication date: September 27, 2012
    Inventors: Norihiro Yoshinaga, Yoshihiko Nakano, Norihiro Tomimatsu, Yoshihiro Akasaka
  • Publication number: 20120171597
    Abstract: According to one embodiment, an anode for a direct methanol fuel cell includes an anode catalyst layer containing a noble metal catalyst and a proton-conductive polyelectrolyte. A log differential pore volume distribution curve measured by a mercury intrusion porosimetry of the anode catalyst layer has a peak within a pore diameter range of 0.06 to 0.3 ?m and satisfies the following relationship: 0.5?(V1/V0)?0.9 wherein V0 is a cumulative pore volume of pores having a diameter of from 0.02 to 1 ?m, as measured by a mercury intrusion porosimetry, and V1 is a cumulative pore volume of pores having a diameter of from 0.02 to 0.2 ?m, as measured by a mercury intrusion porosimetry.
    Type: Application
    Filed: January 26, 2012
    Publication date: July 5, 2012
    Inventors: Taishi FUKAZAWA, Yoshihiro Akasaka, Jungmin Song
  • Publication number: 20120156587
    Abstract: In one embodiment, in a fuel cell, a first electrode supplied with an oxidant gas includes a first gas diffusion layer having a first porous base material and a first catalyst layer having a second porous base material. The first catalyst layer is stacked to the first gas diffusion layer. The second porous base material has a pore diameter distribution with a peak in a range of 0.04 ?m to 0.12 ?m, and a volume ratio of pores with diameters of 0.04 ?m to 0.12 ?m to all the pores being 17% or more. A second electrode supplied with a fuel includes a second gas diffusion layer having a third porous base material and a second catalyst layer having a fourth porous base material. The second catalyst layer is stacked to the second gas diffusion layer. An electrolyte film is held between the first and second catalyst layers.
    Type: Application
    Filed: January 20, 2012
    Publication date: June 21, 2012
    Inventors: Yoshihiro AKASAKA, Masato AKITA, Ryosuke YAGI
  • Publication number: 20120037594
    Abstract: A pattern forming material contains a block copolymer or graft copolymer and forms a structure having micro polymer phases, in which, with respect to at least two polymer chains among polymer chains constituting the block copolymer or graft copolymer, the ratio between N/(Nc?No) values of monomer units constituting respective polymer chains is 1.4 or more, where N represents total number of atoms in the monomer unit, Nc represents the number of carbon atoms in the monomer unit, No represents the number of oxygen atoms in the monomer unit.
    Type: Application
    Filed: October 21, 2011
    Publication date: February 16, 2012
    Inventors: Koji ASAKAWA, Toshiro Hiraoka, Yoshihiro Akasaka, Yasuyuki Hotta
  • Publication number: 20120037595
    Abstract: A pattern forming material contains a block copolymer or graft copolymer and forms a structure having micro polymer phases, in which, with respect to at least two polymer chains among polymer chains constituting the block copolymer or graft copolymer, the ratio between N/(Nc-No) values of monomer units constituting respective polymer chains is 1.4 or more, where N represents total number of atoms in the monomer unit, Nc represents the number of carbon atoms in the monomer unit, No represents the number of oxygen atoms in the monomer unit.
    Type: Application
    Filed: October 21, 2011
    Publication date: February 16, 2012
    Inventors: Koji ASAKAWA, Toshiro Hiraoka, Yoshihiro Akasaka, Yasuyuki Hotta
  • Publication number: 20120041121
    Abstract: A pattern forming material contains a block copolymer or graft copolymer and forms a structure having micro polymer phases, in which, with respect to at least two polymer chains among polymer chains constituting the block copolymer or graft copolymer, the ratio between N/(Nc?No) values of monomer units constituting respective polymer chains is 1.4 or more, where N represents total number of atoms in the monomer unit, Nc represents the number of carbon atoms in the monomer unit, No represents the number of oxygen atoms in the monomer unit.
    Type: Application
    Filed: October 21, 2011
    Publication date: February 16, 2012
    Inventors: Koji ASAKAWA, Toshiro Hiraoka, Yoshihiro Akasaka, Yasuyuki Hotta
  • Patent number: 8043520
    Abstract: A pattern forming material contains a block copolymer or graft copolymer and forms a structure having micro polymer phases, in which, with respect to at least two polymer chains among polymer chains constituting the block copolymer or graft copolymer, the ratio between N/(Nc?No) values of monomer units constituting respective polymer chains is 1.4 or more, where N represents total number of atoms in the monomer unit, Nc represents the number of carbon atoms in the monomer unit, No represents the number of oxygen atoms in the monomer unit.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: October 25, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Koji Asakawa, Toshiro Hiraoka, Yoshihiro Akasaka, Yasuyuki Hotta
  • Publication number: 20100248072
    Abstract: A fuel cell is provided, which includes a membrane electrode assembly including an electrolytic film sandwiched between an anode catalyst layer and a cathode catalyst layer, an anode gas diffusion layer disposed adjacent to the anode catalyst layer and a cathode gas diffusion layer disposed adjacent to the cathode catalyst layer, and a pair of separators which are in contact with the anode gas diffusion layer and the cathode gas diffusion layer, respectively. At least one of the separators includes a metallic member having a channel and an oxide layer disposed on a bottom of the channel. The oxide layer includes silica and tin oxide which accounts for 0.0001-30% by weight of silica.
    Type: Application
    Filed: March 23, 2010
    Publication date: September 30, 2010
    Inventors: Naomi Shida, Yoshihiro Akasaka, Yoshiyuki Isozaki, Miki Hayashi
  • Patent number: 7759019
    Abstract: A cathode includes a diffusion layer, and a porous catalyst layer provided on the diffusion layer. The porous catalyst layer has a thickness not greater than 60 ?m, a porosity of 30 to 70% and a pore diameter distribution including a peak in a range of 20 to 200 nm of a pore diameter. A volume of pores having a diameter of 20 to 200 nm is not less than 50% of a pore volume of the porous catalyst layer. The porous catalyst layer contains a supported catalyst comprising 10 to 30% by weight of a fibrous supported catalyst and 70 to 90% by weight of a granular supported catalyst. The fibrous supported catalyst includes a carbon nanofiber having a herringbone structure or a platelet structure. The granular supported catalyst includes a carbon black having 200 to 600 mL/100 g of a dibutyl phthalate (DBP) absorption value.
    Type: Grant
    Filed: March 9, 2006
    Date of Patent: July 20, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Wu Mei, Miho Maruyama, Jun Tamura, Yoshihiro Akasaka, Yoshihiko Nakano
  • Publication number: 20100047652
    Abstract: A cathode for a direct methanol fuel cell is provided. The cathode comprises a cathode catalyst layer includes a first carbon powder supporting a noble metal catalyst, a proton conductive polyelectrolyte at least partially covering a surface of the first carbon powder, and a second carbon powder having a water repellent material on a surface thereof. The cathode catalyst layer is accompanied with a porous structure satisfying following conditions. 40%?(V1/V0)?70% wherein V0 represents a volume of pores having a diameter ranging from 3 nm to 10 ?m, and V1 represents a volume of pores having a diameter ranging from 50 nm to 10 ?m.
    Type: Application
    Filed: August 17, 2009
    Publication date: February 25, 2010
    Inventors: Jungmin Song, Taishi Fukazawa, Yoshihiro Akasaka, Minoru Hashimoto, Masato Akita
  • Publication number: 20090214918
    Abstract: The present invention provides an anode used in a direct methanol fuel cell and a direct methanol fuel cell employing that anode. They can prevent crossovers of methanol and water and also can control permeation of water, so as to achieve high power output. The anode comprises an anode catalyst layer 20 and a gas-diffusion layer 150, and the gas-diffusion layer comprises a porous sheet support mainly made of carbon. In the porous sheet support, a high packing density area 50 is formed near the surface.
    Type: Application
    Filed: February 24, 2009
    Publication date: August 27, 2009
    Inventors: Jungmin SONG, Yoshihiro Akasaka, Masato Akita
  • Publication number: 20090162712
    Abstract: According to an aspect of the present invention, there is provided a fuel cell including: a membrane electrode assembly including: an electrolyte membrane; anode and cathode catalyst layers respectively disposed on the electrolyte membrane; and anode and cathode gas diffusion layers respectively disposed on the anode and cathode catalyst layers; a cathode porous body including a front face portion and a rear face portion and being disposed on the cathode gas diffusion layer at the front face portion, the front face portion having an electric conductivity higher than that of air and having a hydrophilicity higher than that of the rear face portion; an anode passage plate disposed on the anode gas diffusion layer; and an air supply apparatus that supplies air toward an end of the cathode porous body.
    Type: Application
    Filed: December 23, 2008
    Publication date: June 25, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Ryosuke YAGI, Yuusuke Sato, Yoshihiro Akasaka, Norihiro Tomimatsu, Naomi Shida
  • Publication number: 20090148739
    Abstract: A direct methanol fuel cell includes a cathode catalyst layer; an electrolyte membrane; an anode catalyst layer; a first fuel control layer that is water-repellent and conductive and that has pores; a second fuel control layer that is water-repellent and conductive and that has larger pores than the those of the first fuel control layer; a third fuel control layer that is water-repellent and conductive and that has smaller porous than those of the first fuel control layer and those of the second fuel control layer; and an anode GDL layer that is water-repellent and conductive, wherein the membrane and the layers above are arranged in the above order.
    Type: Application
    Filed: March 24, 2008
    Publication date: June 11, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yoshihiro Akasaka, Masato Akita, Ryosuke Yagi, Hiroyasu Sumino, Kazuhiro Yasuda, Taishi Fukazawa
  • Publication number: 20090130380
    Abstract: A pattern forming material contains a block copolymer or graft copolymer and forms a structure having micro polymer phases, in which, with respect to at least two polymer chains among polymer chains constituting the block copolymer or graft copolymer, the ratio between N/(Nc?No) values of monomer units constituting respective polymer chains is 1.4 or more, where N represents total number of atoms in the monomer unit, Nc represents the number of carbon atoms in the monomer unit, No represents the number of oxygen atoms in the monomer unit.
    Type: Application
    Filed: January 16, 2009
    Publication date: May 21, 2009
    Inventors: Koji Asakawa, Toshiro Hiraoka, Yoshihiro Akasaka, Yasuyuki Hotta
  • Patent number: 7517466
    Abstract: A pattern forming material contains a block copolymer or graft copolymer and forms a structure having micro polymer phases, in which, with respect to at least two polymer chains among polymer chains constituting the block copolymer or graft copolymer, the ratio between N/(Nc?No) values of monomer units constituting respective polymer chains is 1.4 or more, where N represents total number of atoms in the monomer unit, Nc represents the number of carbon atoms in the monomer unit, No represents the number of oxygen atoms in the monomer unit.
    Type: Grant
    Filed: June 20, 2006
    Date of Patent: April 14, 2009
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Koji Asakawa, Toshiro Hiraoka, Yoshihiro Akasaka, Yasuyuki Hotta