Patents by Inventor Keizo ISEKI

Keizo ISEKI 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: 10790531
    Abstract: This collector plate includes a peripheral edge wall that surrounds a predetermined region, and is provided on at least one surface of the collector plate, in which a surface roughness (Ra) of a first surface which is an exposed surface of the peripheral edge wall on the side of one surface, which is measured along a direction perpendicular to an extension direction of the peripheral edge wall is greater than a surface roughness (Ra) of the first surface which is measured along the extension direction of the peripheral edge wall.
    Type: Grant
    Filed: December 6, 2017
    Date of Patent: September 29, 2020
    Assignee: SHOWA DENKO K.K.
    Inventors: Masatoshi Ichikawa, Keizo Iseki, Kenzo Hanawa
  • Patent number: 10727498
    Abstract: A redox flow electrode according to one aspect of the present invention is a redox flow battery electrode disposed between an ion exchange membrane and a bipolar plate, wherein the electrode includes a conductive sheet containing carbon nanotubes having an average fiber diameter of 1 ?m or less, and a porous sheet that is laminated to the conductive sheet and is formed from fibers having an average fiber diameter of greater than 1 ?m.
    Type: Grant
    Filed: December 24, 2015
    Date of Patent: July 28, 2020
    Assignee: SHOWA DENKO K.K.
    Inventors: Keizo Iseki, Masatoshi Ichikawa, Gaku Oriji, Kenzo Hanawa
  • Patent number: 10707514
    Abstract: A redox flow battery is provided, including an ion-exchange membrane, a current collector plate, and an electrode that is disposed between the ion-exchange membrane and the current collector plate. The electrode includes a main electrode layer in which an electrolytic solution flows from a surface on the current collector plate side to a surface on the ion-exchange membrane side, and the main electrode layer includes a plurality of main electrode pieces which are arranged in parallel in a plane direction.
    Type: Grant
    Filed: January 30, 2018
    Date of Patent: July 7, 2020
    Assignee: SHOWA DENKO K.K.
    Inventors: Kenzo Hanawa, Masatoshi Ichikawa, Gaku Oriji, Irwansyah, Keizo Iseki
  • Patent number: 10680248
    Abstract: An electrode material including a conductive sheet containing carbon nanotubes having an average fiber diameter of 1 ?m or less; a liquid inflow member that is formed on a first surface of the conductive sheet such that an electrolyte solution that is passed therethrough flows into the conductive sheet; and a liquid outflow member that is formed on a second surface of the conductive sheet and out of which flows the electrolyte solution that has passed through the conductive sheet; wherein, when using a sheet surface of the conductive sheet as a reference plane, the Darcy permeability, in an in-plane direction, inside the liquid inflow member, is at least 100 times the Darcy permeability, in a normal direction, through the conductive sheet.
    Type: Grant
    Filed: April 1, 2016
    Date of Patent: June 9, 2020
    Assignee: SHOWA DENKO K.K.
    Inventors: Masatoshi Ichikawa, Keizo Iseki, Gaku Oriji, Kenzo Hanawa
  • Publication number: 20200075967
    Abstract: This collector plate includes a plurality of grooves through which an electrolyte is capable of flowing, and which are provided in at least one surface of the collector plate, in which a surface roughness (Ra) of an internal surface of each groove is smaller than a surface roughness (Ra) of a first surface connecting together the grooves.
    Type: Application
    Filed: December 6, 2017
    Publication date: March 5, 2020
    Applicant: SHOW A DENKO K.K.
    Inventors: Masatoshi ICHIKAWA, Keizo ISEKI, Kenzo HANAWA
  • Publication number: 20200075968
    Abstract: This collector plate includes a plurality of flow paths through which an electrolyte is capable of flowing, and which are provided in at least one surface of the collector plate, in which a surface roughness (RaT) of a first surface of an internal wall regulated between the plurality of flow paths, which is measured along a width direction of the internal wall, is smaller than a surface roughness (Rat) of the first surface which is measured along a length direction of the internal wall.
    Type: Application
    Filed: December 6, 2017
    Publication date: March 5, 2020
    Applicant: SHOWA DENKO K.K.
    Inventors: Masatoshi ICHIKAWA, Keizo ISEKI, Kenzo HANAWA
  • Publication number: 20190393534
    Abstract: This collector plate includes a peripheral edge wall that surrounds a predetermined region, and is provided on at least one surface of the collector plate, in which a surface roughness (Ra) of a first surface which is an exposed surface of the peripheral edge wall on the side of one surface, which is measured along a direction perpendicular to an extension direction of the peripheral edge wall is greater than a surface roughness (Ra) of the first surface which is measured along the extension direction of the peripheral edge wall.
    Type: Application
    Filed: December 6, 2017
    Publication date: December 26, 2019
    Applicant: SHOWA DENKO K.K.
    Inventors: Masatoshi ICHIKAWA, Keizo ISEKI, Kenzo HANAWA
  • Publication number: 20190393533
    Abstract: This collector plate includes a plurality of flow paths through which an electrolyte flows and which are provided in at least one surface of the collector plate, in which an arithmetic surface roughness (Ra) of a first surface, which is an exposed surface of a wall portion between the plurality of flow paths on the side of one surface, is greater than or equal to 1 ?m and less than or equal to 300 ?m.
    Type: Application
    Filed: December 6, 2017
    Publication date: December 26, 2019
    Applicant: SHOWA DENKO K.K.
    Inventors: Masatoshi ICHIKAWA, Keizo ISEKI, Kenzo HANAWA
  • Publication number: 20190267657
    Abstract: A redox flow battery including: an ion-exchange membrane; a current collector plate; and an electrode disposed between the ion-exchange membrane and the current collector plate, wherein charging and discharging are performed by flowing of an electrolytic solution to the electrode. The electrode includes a first electrode part and a second electrode part in this order from the current collector plate side. The area of the second electrode part is larger than the area of the first electrode part and the second electrode part covers the whole of the first electrode part, when viewed from the ion-exchange membrane side. The current collector plate has a peripheral edge wall, which forms a housing region to which the first electrode part fits, on a surface of the electrode side. The second electrode part covers at least a part of a surface of the peripheral edge wall on the ion-exchange membrane side.
    Type: Application
    Filed: August 4, 2017
    Publication date: August 29, 2019
    Applicant: SHOWA DENKO K.K.
    Inventors: Masatoshi ICHIKAWA, Keizo ISEKI, Kenzo HANAWA
  • Publication number: 20190198904
    Abstract: The present invention provides a redox flow secondary battery including a positive electrode, a negative electrode facing the positive electrode, and an ion exchange membrane provided between the positive electrode and the negative electrode, at least one electrode of the positive electrode and the negative electrode has a metal protective film having an opening and a carbon electrode including carbon fibers in order from the ion exchange membrane side, and the height of the protruding peak portion of the surface of the metal protective film, which is in contact with the ion exchange membrane, is 0.1 to 2 ?m.
    Type: Application
    Filed: September 1, 2017
    Publication date: June 27, 2019
    Applicant: SHOWA DENKO K.K.
    Inventors: Masatoshi ICHIKAWA, Keizo ISEKI, Kenzo HANAWA
  • Publication number: 20180366736
    Abstract: An electrode material including a conductive sheet containing carbon nanotubes having an average fiber diameter of 1 ?m or less; a liquid inflow member that is formed on a first surface of the conductive sheet such that an electrolyte solution that is passed therethrough flows into the conductive sheet; and a liquid outflow member that is formed on a second surface of the conductive sheet and out of which flows the electrolyte solution that has passed through the conductive sheet; wherein, when using a sheet surface of the conductive sheet as a reference plane, the Darcy permeability, in an in-plane direction, inside the liquid inflow member, is at least 100 times the Darcy permeability, in a normal direction, through the conductive sheet.
    Type: Application
    Filed: April 1, 2016
    Publication date: December 20, 2018
    Applicant: SHOWA DENKO K.K.
    Inventors: Masatoshi ICHIKAWA, Keizo ISEKI, Gaku ORIJI, Kenzo HANAWA
  • Publication number: 20180212266
    Abstract: A redox flow battery is provided, including an ion-exchange membrane, a current collector plate, and an electrode that is disposed between the ion-exchange membrane and the current collector plate. The electrode includes a main electrode layer in which an electrolytic solution flows from a surface on the current collector plate side to a surface on the ion-exchange membrane side, and the main electrode layer includes a plurality of main electrode pieces which are arranged in parallel in a plane direction.
    Type: Application
    Filed: January 30, 2018
    Publication date: July 26, 2018
    Applicant: SHOWA DENKO K.K.
    Inventors: Kenzo HANAWA, Masatoshi ICHIKAWA, Gaku ORIJI, Irwansyah, Keizo ISEKI
  • Publication number: 20180034066
    Abstract: A redox flow electrode according to one aspect of the present invention is a redox flow battery electrode disposed between an ion exchange membrane and a bipolar plate, wherein the electrode includes a conductive sheet containing carbon nanotubes having an average fiber diameter of 1 ?m or less, and a porous sheet that is laminated to the conductive sheet and is formed from fibers having an average fiber diameter of greater than 1 ?m.
    Type: Application
    Filed: December 24, 2015
    Publication date: February 1, 2018
    Applicant: SHOWA DENKO K.K.
    Inventors: Keizo ISEKI, Masatoshi ICHIKAWA, Gaku ORIJI, Kenzo HANAWA