Patents by Inventor Hitoshi Ishimoto

Hitoshi Ishimoto 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: 20220165512
    Abstract: A capacitor electrode including a first carbon, and at least one of a second carbon and a metal porous body. The first carbon includes a graphene, and the second carbon includes short carbon fibers having an average length of 10 ?m or less and/or carbon particles having an average diameter of 0.1 ?m or less. The graphene is layered via the second carbon.
    Type: Application
    Filed: March 19, 2020
    Publication date: May 26, 2022
    Inventors: Kenichi EZAKI, Chiho NOBUMORI, Takahiro YOSHINO, Hitoshi ISHIMOTO
  • Publication number: 20220149409
    Abstract: A membrane-electrode assembly includes an electrolyte membrane, a pair of catalyst layers stacked on surfaces of the electrolyte membrane, and a pair of gas diffusion layers stacked on a side opposite to the electrolyte membrane of one of the pair of catalyst layers and on a side opposite to the electrolyte membrane of the other one of the catalyst layers. One of the pair of catalyst layers contains catalyst particles and a first conductive material. One of the pair of gas diffusion layers in contact with the one of the catalyst layers contains a second conductive material. The first conductive material includes a first particulate conductive member and a first fibrous conductive member, and the second conductive material includes a second fibrous conductive member. The content K2 by mass of the second fibrous conductive member is larger than the content K1 by mass of the first fibrous conductive member.
    Type: Application
    Filed: March 5, 2020
    Publication date: May 12, 2022
    Inventors: Hitoshi ISHIMOTO, Takeshi MINAMIURA, Shinichiro IMURA, Yoshifumi TAGUCHI, Tsutomu KAWASHIMA
  • Publication number: 20220149388
    Abstract: A cathode catalyst layer has two layers: a first catalyst layer on a gas diffusion layer side, and a second catalyst layer on an electrolyte membrane side. The first catalyst layer includes a first particulate conductive member, first catalyst particles, and a first fibrous conductive member, at least part of the first catalyst particles being supported on the first particulate conductive member. The second catalyst layer includes a second particulate conductive member and second catalyst particles, at least part of the second catalyst particles being supported on the second particulate conductive member. A catalyst support density D2 of the second catalyst particles on the second particulate conductive member is greater than a catalyst support density Di of the first catalyst particles on the first particulate conductive member.
    Type: Application
    Filed: February 26, 2020
    Publication date: May 12, 2022
    Inventors: Hiroaki SUZUKI, Kazuya YAMASAKI, Hitoshi ISHIMOTO
  • Patent number: 11145873
    Abstract: A membrane electrode assembly includes an electrolyte membrane, and a pair of electrodes sandwiching the electrolyte membrane. The pair of electrodes each include a catalyst layer, and a gas diffusion layer disposed on the catalyst layer on an opposite side to the electrolyte membrane. At least one of the catalyst layers contains first catalyst particles, and second catalyst particles. The first catalyst particles are either platinum particles or platinum alloy particles, or both. The second catalyst particles are core-shell particles having a core part and a shell part, the core part formed of at least one selected from transition metals other than platinum, the shell part covering the core part and formed of at least one of platinum and a platinum alloy. In the catalyst layer, the second catalyst particles are present in a smaller percentage in an electrolyte membrane side than they are in a gas diffusion layer side.
    Type: Grant
    Filed: February 19, 2018
    Date of Patent: October 12, 2021
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Kazuya Yamasaki, Hitoshi Ishimoto, Motohiro Sakata
  • Publication number: 20210167400
    Abstract: A membrane electrode assembly includes an electrolyte membrane, and a pair of electrodes sandwiching the electrolyte membrane. The pair of electrodes each include a catalyst layer, and a gas diffusion layer disposed on the catalyst layer on an opposite side to the electrolyte membrane. At least one of the catalyst layers contains first catalyst particles, and second catalyst particles. The first catalyst particles are either platinum particles or platinum alloy particles, or both. The second catalyst particles are core-shell particles having a core part and a shell part, the core part formed of at least one selected from transition metals other than platinum, the shell part covering the core part and formed of at least one of platinum and a platinum alloy. In the catalyst layer, the second catalyst particles are present in a smaller percentage in an electrolyte membrane side than they are in a gas diffusion layer side.
    Type: Application
    Filed: February 19, 2018
    Publication date: June 3, 2021
    Inventors: Kazuya YAMASAKI, Hitoshi ISHIMOTO, Motohiro SAKATA
  • Patent number: 11011769
    Abstract: Provided is a fuel cell catalyst layer including: a fibrous carbon material; catalyst particles; a particulate carbon material; and a proton-conductive resin, wherein a region A including at least the fibrous carbon material in a state of an agglomerated body and a region B including at least the catalyst particles, the particulate carbon material, and the proton-conductive resin are formed, the region A being disposed in an island form in the region B.
    Type: Grant
    Filed: September 5, 2017
    Date of Patent: May 18, 2021
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Motohiro Sakata, Takeshi Minamiura, Shinichiro Imura, Hitoshi Ishimoto, Kazuya Yamasaki, Chiho Nobumori, Yukihiro Shimasaki, Tsutomu Fujii
  • Publication number: 20210143460
    Abstract: A membrane electrode assembly includes an electrolyte membrane, and a pair of electrode layers which sandwich the electrolyte membrane. The pair of electrode layers include a pair of catalyst layers which sandwich the electrolyte membrane, and a pair of gas diffusion layers disposed on the pair of catalyst layers on opposite sides to the electrolyte membrane. At least one catalyst layer contains a fibrous electric conductor, catalyst particles, a particulate electric conductor, and a proton-conductive resin. The at least one catalyst layer has a first region at a distance of 200 nm or less from the fibrous electric conductor, and a second region at a distance of more than 200 nm from the fibrous electric conductor. Pores are present in the first and second regions. A mode diameter M1 of the pores in the first region and a mode diameter M2 of the pores in the second region satisfy M1<M2.
    Type: Application
    Filed: February 9, 2018
    Publication date: May 13, 2021
    Inventors: Hitoshi ISHIMOTO, Kazuya YAMASAKI, Motohiro SAKATA
  • Publication number: 20210098797
    Abstract: A cathode catalyst layer of fuel cells, the cathode catalyst layer including a first fibrous electrically-conductive member, a first particulate electrically-conductive member, first catalyst particles, and a first proton conductive resin, A ratio I1/C1 of a mass of the first proton conductive resin to a mass of the first electrically particulate conductive member is in a range of 1.0 to 1.6. A ratio of the first fibrous electrically-conductive member to 100 parts by mass of the first particulate conductive member is 30 to 50 parts by mass. The first proton conductive resin has an EW value of 600 to 850.
    Type: Application
    Filed: July 18, 2019
    Publication date: April 1, 2021
    Inventors: Shinichiro IMURA, Takeshi MINAMIURA, Hitoshi ISHIMOTO
  • Publication number: 20210075024
    Abstract: The preset disclosure provides a catalyst layer that has a small contact resistance with a gas diffusion layer and excellent gas diffusion properties. The catalyst layer for a fuel cell has a uniform thickness and includes fibrous conductive members and catalyst particles. The fibrous conductive members are inclined relative to a surface direction of the catalyst layer, and a lengthwise direction of the fibrous conductive members, on average, matches a first direction.
    Type: Application
    Filed: December 26, 2018
    Publication date: March 11, 2021
    Inventors: Takeshi MINAMIURA, Hitoshi ISHIMOTO, Shinichiro IMURA, Kazuya YAMASAKI, Yukihiro SHIMASAKI
  • Publication number: 20200335797
    Abstract: Disclosed is a catalyst layer for a fuel cell that has good gas diffusion properties in the entire catalyst layer and in which coarsening of catalyst particles can be suppressed. The catalyst layer for a fuel cell includes fibrous conductive members and catalyst particles. The fibrous conductive members are inclined relative to the surface direction of the catalyst layer, and the length L of the fibrous conductive members and the thickness T of the catalyst layer satisfy the relational expression: L/T?3. Each of the catalyst particles includes a core portion and a shell portion that covers the core portion, and contains a component different from that of the core portion.
    Type: Application
    Filed: December 26, 2018
    Publication date: October 22, 2020
    Inventors: Hitoshi ISHIMOTO, Kazuya YAMASAKI, Shinichiro IMURA, Takeshi MINAMIURA, Yukihiro SHIMASAKI, Kenichi EZAKI
  • Patent number: 10714761
    Abstract: A fuel cell catalyst layer includes a plurality of carbon particles, a plurality of catalyst particles, and at least one plate-shaped carbon member disposed between the plurality of carbon particles. The plurality of catalyst particles are supported on surfaces of the plurality of carbon particles. The plate-shaped carbon member may be replaced with a rod-shaped carbon member.
    Type: Grant
    Filed: September 5, 2017
    Date of Patent: July 14, 2020
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Kazuya Yamasaki, Hitoshi Ishimoto, Masashi Shoji, Keiichi Kondou
  • Patent number: 10388966
    Abstract: An electrode catalyst material includes graphite particles and catalyst particles. Each of the graphite particles has a hollow structure that includes an outer shell, and the outer shell has at least one of a through-hole and a recess. Each of the catalyst particles is supported by the at least one of through-hole and recess.
    Type: Grant
    Filed: November 28, 2017
    Date of Patent: August 20, 2019
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Keiichi Kondou, Kazuya Yamasaki, Hitoshi Ishimoto
  • Publication number: 20190198906
    Abstract: Provided is a fuel cell catalyst layer including: a fibrous carbon material; catalyst particles; a particulate carbon material; and a proton-conductive resin, wherein a region A including at least the fibrous carbon material in a state of an agglomerated body and a region B including at least the catalyst particles, the particulate carbon material, and the proton-conductive resin are formed, the region A being disposed in an island form in the region B.
    Type: Application
    Filed: September 5, 2017
    Publication date: June 27, 2019
    Inventors: Motohiro SAKATA, Takeshi MINAMIURA, Shinichiro IMURA, Hitoshi ISHIMOTO, Kazuya YAMASAKI, Chiho NOBUMORI, Yukihiro SHIMASAKI, Tsutomu FUJII
  • Publication number: 20190181480
    Abstract: Provided is a membrane electrode assembly capable of keeping contact resistance between a catalyst layer and a gas diffusion layer (GDL) low. The membrane electrode assembly includes an electrolyte membrane and a pair of electrode layers disposed to sandwich the electrolyte membrane. The pair of electrode layers includes a pair of catalyst layers disposed to sandwich the electrolyte membrane, and a pair of GDLs disposed on opposite sides of the electrolyte membrane on the respective pair of catalyst layers. Each of the pair of GDLs includes a plurality of GDL protrusions that protrude on a catalyst layer side from the GDL and enter in the catalyst layer, and a gas flow path formed on an opposite side of the catalyst layer. Each of the pair of catalyst layers has a plurality of catalyst layer recesses in contact with the respective plurality of GDL protrusions.
    Type: Application
    Filed: February 13, 2019
    Publication date: June 13, 2019
    Inventors: MASASHI SHOJI, HITOSHI ISHIMOTO, SHINICHIRO IMURA, HIROAKI SUZUKI
  • Publication number: 20180083291
    Abstract: An electrode catalyst material includes graphite particles and catalyst particles. Each of the graphite particles has a hollow structure that includes an outer shell, and the outer shell has at least one of a through-hole and a recess. Each of the catalyst particles is supported by the at least one of through-hole and recess.
    Type: Application
    Filed: November 28, 2017
    Publication date: March 22, 2018
    Inventors: Keiichi Kondou, Kazuya Yamasaki, Hitoshi Ishimoto
  • Patent number: 9853174
    Abstract: A photoelectric conversion element includes a first electrode layer, a photoelectric conversion layer, and a second electrode layer. The first electrode layer includes a first base member, and a rough layer formed on the first base member. The photoelectric conversion layer is formed on the rough layer, and the second electrode layer is formed above the photoelectric conversion layer. The rough layer includes a plurality of metal fine particles irregularly connected together and to a surface of the first base member, and the photoelectric conversion layer infiltrates among the plurality of metal fine particles constituting the rough layer.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: December 26, 2017
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Yuta Moriura, Hitoshi Ishimoto
  • Publication number: 20170365862
    Abstract: A fuel cell catalyst layer includes a plurality of carbon particles, a plurality of catalyst particles, and at least one plate-shaped carbon member disposed between the plurality of carbon particles. The plurality of catalyst particles are supported on surfaces of the plurality of carbon particles. The plate-shaped carbon member may be replaced with a rod-shaped carbon member.
    Type: Application
    Filed: September 5, 2017
    Publication date: December 21, 2017
    Inventors: KAZUYA YAMASAKI, HITOSHI ISHIMOTO, MASASHI SHOJI, KEIICHI KONDOU
  • Patent number: 9373448
    Abstract: A method of manufacturing an electrolytic capacitor includes preparing a dielectric film formed on a surface of an anode foil, forming a first conductive polymer layer on a surface of the dielectric film by immersing the anode foil in first dispersion solution including conductive polymer particles and forming a second conductive polymer layer covering the first conductive polymer layer solvent by immersing the anode foil in second dispersion solution including second conductive polymer particles and second solvent. The surface of the anode foil has plural pits formed therein. The second dispersion solution has a pH value farther from 7 than the first dispersion solution does. This configuration can suppress damages to the dielectric film.
    Type: Grant
    Filed: March 7, 2012
    Date of Patent: June 21, 2016
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Ryo Majima, Hitoshi Ishimoto, Tatsuji Aoyama
  • Publication number: 20150318417
    Abstract: A photoelectric conversion element includes a first electrode layer, a photoelectric conversion layer, and a second electrode layer. The first electrode layer includes a first base member, and a rough layer formed on the first base member. The photoelectric conversion layer is formed on the rough layer, and the second electrode layer is formed above the photoelectric conversion layer. The rough layer includes a plurality of metal fine particles irregularly connected together and to a surface of the first base member, and the photoelectric conversion layer infiltrates among the plurality of metal fine particles constituting the rough layer.
    Type: Application
    Filed: November 18, 2013
    Publication date: November 5, 2015
    Inventors: YUTA MORIURA, HITOSHI ISHIMOTO
  • Patent number: 9001497
    Abstract: An electrode foil includes a substrate and a coarse film layer having a void therein and formed on the substrate. The coarse film layer includes at least a first coarse film layer formed on the substrate. The first coarse film layer is composed of arrayed first columnar bodies. Each of the first columnar bodies is composed of metallic microparticles stacked on a surface of the substrate and extending in a curve from the surface of the substrate.
    Type: Grant
    Filed: March 14, 2011
    Date of Patent: April 7, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Akiyoshi Oshima, Hiroki Kamiguchi, Masashi Shoji, Hitoshi Ishimoto