Patents by Inventor Takehiro Okei

Takehiro Okei 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).

  • Precursor sheet for fuel cell separator, and fuel cell separator
    Patent number: 11942666
    Abstract: This precursor sheet for a fuel cell separator comprises a conductive substrate sheet, a dense layer including first graphite particles, and a conduction layer including second graphite particles, wherein the dense layer and the conduction layer include a resin, the first graphite particles have a volume resistivity of 20 m?·cm or greater and a bulk density of 1.7 g/cm3 or greater when compressed at 30 MPa, and the second graphite particles have a volume resistivity of less than 20 m?·cm and a bulk density of 1.5 g/cm3 or greater when compressed at 30 MPa. This precursor sheet for a fuel cell separator provides a fuel cell separator that has excellent shapability and good mechanical strength, conductivity, and gas impermeability.
    Type: Grant
    Filed: November 30, 2022
    Date of Patent: March 26, 2024
    Assignee: NISSHINBO CHEMICAL INC.
    Inventors: Tomoyuki Araki, Miho Iwai, Takehiro Okei, Kosuke Yasuda
  • PRECURSOR SHEET FOR FUEL CELL SEPARATOR, AND FUEL CELL SEPARATOR
    Publication number: 20240047705
    Abstract: This precursor sheet for a fuel cell separator comprises a conductive substrate sheet, a dense layer including first graphite particles, and a conduction layer including second graphite particles, wherein the dense layer and the conduction layer include a resin, the first graphite particles have a volume resistivity of 20 m?·cm or greater and a bulk density of 1.7 g/cm3 or greater when compressed at 30 MPa, and the second graphite particles have a volume resistivity of less than 20 m?·cm and a bulk density of 1.5 g/cm3 or greater when compressed at 30 MPa. This precursor sheet for a fuel cell separator provides a fuel cell separator that has excellent shapability and good mechanical strength, conductivity, and gas impermeability.
    Type: Application
    Filed: November 30, 2022
    Publication date: February 8, 2024
    Applicant: NISSHINBO CHEMICAL INC.
    Inventors: Tomoyuki Araki, Miho Iwai, Takehiro Okei, Kosuke Yasuda
  • Fuel cell separator precursor, and fuel cell separator
    Patent number: 11515547
    Abstract: Provided is a fuel cell separator precursor that is obtained by impregnating a porous sheet, which contains a conductive filler, with a resin composition that contains a thermoplastic resin and a conductive filler.
    Type: Grant
    Filed: July 31, 2018
    Date of Patent: November 29, 2022
    Assignee: NISSHINBO HOLDINGS INC.
    Inventors: Kosuke Yasuda, Takehiro Okei, Shoya Ashizaki
  • CONDUCTIVE METAL RESIN MULTILAYER BODY AND MOLDED BODY OF SAME
    Publication number: 20210394460
    Abstract: The present invention provides a conductive metal resin multilayer body that comprises: a metal foil; and a resin layer which is arranged on at least one surface of the metal foil, and which contains a resin, organic fibers and a conductive filler that is formed of a non-metal material.
    Type: Application
    Filed: October 11, 2019
    Publication date: December 23, 2021
    Applicant: Nisshinbo Holdings Inc.
    Inventors: Kosuke Yasuda, Takehiro Okei, Shoya Ashizaki, Reon Ooyagi
  • FUEL CELL SEPARATOR PRECURSOR, AND FUEL CELL SEPARATOR
    Publication number: 20200365914
    Abstract: Provided is a fuel cell separator precursor that is obtained by impregnating a porous sheet, which contains a conductive filler, with a resin composition that contains a thermoplastic resin and a conductive filler.
    Type: Application
    Filed: July 31, 2018
    Publication date: November 19, 2020
    Applicant: Nisshinbo Holdings Inc.
    Inventors: Kosuke Yasuda, Takehiro Okei, Shoya Ashizaki
  • FUEL CELL SEPARATOR CONDUCTIVE SHEET AND FUEL CELL SEPARATOR
    Publication number: 20200168916
    Abstract: Provided is a fuel cell separator conductive sheet comprising a conductive filler, first organic fibers, and second organic fibers, wherein the melting point of the first organic fibers is higher than a heating temperature at which the conductive sheet is shaped to produce a fuel cell separator, and the melting point of the second organic fibers is lower than the heating temperature.
    Type: Application
    Filed: July 31, 2018
    Publication date: May 28, 2020
    Applicant: Nisshinbo Holdings Inc.
    Inventors: Kosuke Yasuda, Takehiro Okei, Shoya Ashizaki