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).

  • Patent number: 10306752
    Abstract: According to one embodiment, a transparent conductor includes a transparent substrate; a metal nanowire layer disposed on the transparent substrate and including a plurality of metal nanowires; a graphene oxide layer covering the metal nanowire layer; and an electrical insulating resin layer disposed in contact with the graphene oxide layer.
    Type: Grant
    Filed: July 11, 2017
    Date of Patent: May 28, 2019
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Katsuyuki Naito, Norihiro Yoshinaga, Tianyi Yang, Yoshihiro Akasaka
  • Publication number: 20180068755
    Abstract: According to one embodiment, a method of manufacturing a transparent conductor is provided. In the method, a silver nanowire layer including a plurality of silver nanowires and having openings is formed on a graphene film supported by a copper support. Then, a transparent resin layer insoluble in a copper-etching solution is formed on the silver nanowire layer such that the transparent resin layer contacts the graphene film through the openings. The copper support is then brought into contact with the non-acidic copper-etching solution to remove the copper support, thereby exposing the graphene film.
    Type: Application
    Filed: November 14, 2017
    Publication date: March 8, 2018
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Katsuyuki Naito, Yoshihiro Akasaka, Tianyi Yang, Norihiro Yoshinaga
  • Patent number: 9863047
    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: Grant
    Filed: August 7, 2014
    Date of Patent: January 9, 2018
    Assignee: Toshiba Lifestyle Products & Services Corporation
    Inventors: Norihiro Yoshinaga, Yoshihiko Nakano, Norihiro Tomimatsu, Yoshihiro Akasaka
  • Patent number: 9865882
    Abstract: According to one embodiment, the noble metal catalyst layer includes first noble metal layer and a second noble metal layer formed on the first noble metal layer. The first noble metal layer includes a first noble metal element and has a porosity of 65 to 95 vol. %, a volume of pores having a diameter of 5 to 80 nm accounts for 50% or more of a volume of total pores in the first noble metal layer. The second noble metal layer includes a second noble metal element, and has an average thickness of 3 to 20 nm and a porosity of 50 vol. % or less.
    Type: Grant
    Filed: March 26, 2013
    Date of Patent: January 9, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Wu Mei, Shigeru Matake, Taishi Fukazawa, Yoshihiro Akasaka, Katsuyuki Naito
  • Patent number: 9847150
    Abstract: According to one embodiment, a method of manufacturing a transparent conductor is provided. In the method, a silver nanowire layer including a plurality of silver nanowires and having openings is formed on a graphene film supported by a copper support. Then, a transparent resin layer insoluble in a copper-etching solution is formed on the silver nanowire layer such that the transparent resin layer contacts the graphene film through the openings. The copper support is then brought into contact with the non-acidic copper-etching solution to remove the copper support, thereby exposing the graphene film.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: December 19, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Katsuyuki Naito, Yoshihiro Akasaka, Tianyi Yang, Norihiro Yoshinaga
  • Publication number: 20170311441
    Abstract: According to one embodiment, a transparent conductor includes a transparent substrate; a metal nanowire layer disposed on the transparent substrate and including a plurality of metal nanowires; a graphene oxide layer covering the metal nanowire layer; and an electrical insulating resin layer disposed in contact with the graphene oxide layer.
    Type: Application
    Filed: July 11, 2017
    Publication date: October 26, 2017
    Inventors: Katsuyuki NAITO, Norihiro YOSHINAGA, Tianyi YANG, Yoshihiro AKASAKA
  • Patent number: 9793549
    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: Grant
    Filed: September 25, 2012
    Date of Patent: October 17, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Taishi Fukazawa, Wu Mei, Yoshihiro Akasaka, Norihiro Yoshinaga
  • Patent number: 9777382
    Abstract: According to one embodiment, an electrochemical cell includes an anode, a cathode and an electrolytic membrane interposed therebetween. At least one of the anode and the cathode is formed of an integral solid conductive plate and includes a first surface in contact with the electrolytic membrane and a second surface apart from the first surface in a thickness direction. The at least one of the anode and the cathode includes a plurality of first pores opened in the first surface and a plurality of second pores opened in the second surface, the second pores communicating with a part of the first pores. The first pores are smaller than the second pores, and the concentration of pores in the first surface is higher than that in the second surface.
    Type: Grant
    Filed: June 3, 2015
    Date of Patent: October 3, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Norihiro Yoshinaga, Hiroaki Hirazawa, Yoshihiro Akasaka, Katsuyuki Naito, Taishi Fukazawa, Jun Tamura, Ryosuke Yagi
  • Patent number: 9763320
    Abstract: According to one embodiment, a transparent conductor includes a transparent substrate; a metal nanowire layer disposed on the transparent substrate and including a plurality of metal nanowires; a graphene oxide layer covering the metal nanowire layer; and an electrical insulating resin layer disposed in contact with the graphene oxide layer.
    Type: Grant
    Filed: March 5, 2015
    Date of Patent: September 12, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Katsuyuki Naito, Norihiro Yoshinaga, Tianyi Yang, Yoshihiro Akasaka
  • Patent number: 9645454
    Abstract: According to one embodiment, the transparent conductive film contains a laminated structure including a conductive layer and a transparent polymer layer. The conductive layer contains a metal nanowire and a carbon material including grapheme. The transparent polymer layer contains a transparent polymer having a glass transition temperature of 100° C. or less. The carbon material constitutes one surface of the transparent conductive film.
    Type: Grant
    Filed: February 27, 2014
    Date of Patent: May 9, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Katsuyuki Naito, Norihiro Yoshinaga, Yoshihiro Akasaka, Tomio Ono
  • Publication number: 20160355934
    Abstract: According to one embodiment, an electrochemical cell includes an anode, a cathode and an electrolytic membrane interposed therebetween. At least one of the anode and the cathode is formed of an integral solid conductive plate and includes a first surface in contact with the electrolytic membrane and a second surface apart from the first surface in a thickness direction. The at least one of the anode and the cathode includes a plurality of first pores opened in the first surface and a plurality of second pores opened in the second surface, the second pores communicating with a part of the first pores. The first pores are smaller than the second pores, and the concentration of pores in the first surface is higher than that in the second surface.
    Type: Application
    Filed: June 3, 2015
    Publication date: December 8, 2016
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Norihiro YOSHINAGA, Hiroaki HIRAZAWA, Yoshihiro AKASAKA, Katsuyuki NAITO, Taishi FUKAZAWA, Jun TAMURA, Ryosuke YAGI
  • Publication number: 20160301081
    Abstract: According to an embodiment, a porous catalyst layer includes a metal portion including plural noble metal-including sheets stacked apart from each other, and a porous nanocarbon layer disposed between two adjacent noble metal-including sheets. The plural noble metal-including sheets in the metal portion have an integrated portion. The porous nanocarbon layer includes fibrous nanocarbon.
    Type: Application
    Filed: June 16, 2016
    Publication date: October 13, 2016
    Inventors: Wu MEI, Shigeru MATAKE, Taishi FUKAZAWA, Yoshihiro AKASAKA
  • Patent number: 9419152
    Abstract: A carbon electrode of an embodiment includes: a graphene having a graphene skeleton, carbon atoms in the graphene skeleton being partially substituted by a nitrogen atom, wherein the graphene contains an oxygen atom, and the carbon electrode is doped with a cation.
    Type: Grant
    Filed: February 20, 2013
    Date of Patent: August 16, 2016
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Katsuyuki Naito, Norihiro Yoshinaga, Shigeru Matake, Yoshihiro Akasaka, Takashi Yoshida
  • Patent number: 9406941
    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: Grant
    Filed: March 15, 2012
    Date of Patent: August 2, 2016
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Wu Mei, Taishi Fukazawa, Yoshihiro Akasaka
  • Patent number: 9364820
    Abstract: An oxygen reduction catalyst of an embodiment includes: a stack of single-layer graphenes; and a phosphorus compound, wherein some of carbon atoms of the graphenes are replaced by nitrogen atoms, and the phosphorus compound has a peak of phosphorus 2p orbital of 133.0 to 134.5 eV in X-ray photoelectron spectrum.
    Type: Grant
    Filed: February 20, 2013
    Date of Patent: June 14, 2016
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Katsuyuki Naito, Yoshihiko Nakano, Norihiro Yoshinaga, Shigeru Matake, Yoshihiro Akasaka
  • Publication number: 20160141631
    Abstract: A method of manufacturing a membrane electrode assembly, including: forming a catalyst layer precursor containing a mixture of a catalyst material and a pore-forming material on a substrate having a flatness of 60% or more; removing the pore-forming material from the catalyst layer precursor on the substrate, thereby forming a catalyst layer containing the catalyst material and having a porosity of 20 to 90% by volume; transferring the catalyst layer from the substrate to a gas diffusion layer, to provide an electrode; and bonding the catalyst layer of the electrode to an electrolyte membrane, to provide a membrane electrode assembly.
    Type: Application
    Filed: January 21, 2016
    Publication date: May 19, 2016
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Wu Mei, Shigeru Matake, Taishi Fukazawa, Yoshihiro Akasaka, Katsuyuki Naito
  • Patent number: 9312543
    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: Grant
    Filed: January 20, 2012
    Date of Patent: April 12, 2016
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshihiro Akasaka, Masato Akita, Ryosuke Yagi
  • Publication number: 20160087282
    Abstract: Embodiments of the present disclosure aim to provide a catalyst layer ensuring a high cell voltage and having both excellent robustness and sufficient endurance, and also to provide a process for producing the layer, a membrane electrode assembly and an electrochemical cell.
    Type: Application
    Filed: September 10, 2015
    Publication date: March 24, 2016
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Wu MEI, Shigeru MATAKE, Taishi FUKAZAWA, Yoshihiro AKASAKA
  • Patent number: 9276269
    Abstract: A catalyst layer containing a catalyst material, the catalyst layer having a porosity of 20 to 90% by vol and satisfying a relation: R1?R0×1.2, wherein R1 is an alignment ratio of the catalyst layer; and R0 is 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: Grant
    Filed: September 27, 2012
    Date of Patent: March 1, 2016
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Wu Mei, Shigeru Matake, Taishi Fukazawa, Yoshihiro Akasaka, Katsuyuki Naito
  • Publication number: 20160036048
    Abstract: According to one embodiment, there is provided a composite. The composite includes a graphene sheet material, active material particles, and a carbon layer located between the graphene sheet material and the active material particles. The graphene sheet material includes at least one of a planar graphene sheet of a monoatomic layer and a laminate of 10 layers or less of the planar graphene sheets. The active material particles include a titanium-niobium composite oxide. The carbon layer includes a carbon material having a n-electron system.
    Type: Application
    Filed: March 17, 2015
    Publication date: February 4, 2016
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Katsuyuki NAITO, Yasuhiro HARADA, Norihiro YOSHINAGA, Yoshihiro AKASAKA, Yorikazu YOSHIDA, Kazuki ISE