Patents by Inventor Tsuyoshi Seguchi

Tsuyoshi Seguchi 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: 12331409
    Abstract: The present disclosure relates to a fuel cell separator manufacturing method involving immersing a stainless-steel base material formed into a shape of a separator in an acidic solution having a fluorine ion concentration of 0.1 ppm or higher and a pH of 1±0.2 at 80° C.±5° C. for 60 minutes or longer to perform a modification treatment on a surface of the stainless-steel base material.
    Type: Grant
    Filed: January 8, 2024
    Date of Patent: June 17, 2025
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yusuke Nomura, Hijiri Hirata, Tsuyoshi Seguchi
  • Publication number: 20240301564
    Abstract: The present disclosure relates to a fuel cell separator manufacturing method involving immersing a stainless-steel base material formed into a shape of a separator in an acidic solution having a fluorine ion concentration of 0.1 ppm or higher and a pH of 1±0.2 at 80° C.±5° C. for 60 minutes or longer to perform a modification treatment on a surface of the stainless-steel base material.
    Type: Application
    Filed: January 8, 2024
    Publication date: September 12, 2024
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yusuke NOMURA, Hijiri HIRATA, Tsuyoshi SEGUCHI
  • Patent number: 11069905
    Abstract: A method for manufacturing a fuel cell separator that ensures an improved corrosion resistance under usage environment of a fuel cell and restraining an increase of a contact resistance with a power generation unit by enhancing a sticking force of a conductive carbon film formed on a surface in contact with the power generation unit on a surface of a titanium substrate is provided. It is a method for manufacturing a fuel cell separator. The fuel cell separator includes a contact portion that is in contact with a power generation unit so as to partition the power generation units including electrodes of the fuel cell, and includes a conductive carbon film formed on the contact portion. First, a titanium substrate that has a plurality of projecting portions formed corresponding to a shape of the contact portion and recessed portions for gas flow channels formed between the projecting portions are prepared as a substrate of the separator.
    Type: Grant
    Filed: December 11, 2018
    Date of Patent: July 20, 2021
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Tsuyoshi Seguchi, Koutaro Ikeda, Yukihiro Shibata
  • Publication number: 20190190035
    Abstract: A method for manufacturing a fuel cell separator that ensures an improved corrosion resistance under usage environment of a fuel cell and restraining an increase of a contact resistance with a power generation unit by enhancing a sticking force of a conductive carbon film formed on a surface in contact with the power generation unit on a surface of a titanium substrate is provided. It is a method for manufacturing a fuel cell separator. The fuel cell separator includes a contact portion that is in contact with a power generation unit so as to partition the power generation units including electrodes of the fuel cell, and includes a conductive carbon film formed on the contact portion. First, a titanium substrate that has a plurality of projecting portions formed corresponding to a shape of the contact portion and recessed portions for gas flow channels formed between the projecting portions are prepared as a substrate of the separator.
    Type: Application
    Filed: December 11, 2018
    Publication date: June 20, 2019
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tsuyoshi SEGUCHI, Koutaro IKEDA, Yukihiro SHIBATA
  • Publication number: 20160141634
    Abstract: Disclosed is a separator for a fuel cell which is able to suppress peeling off or cracking of a conductive carbon film occurring at the time of insertion and extraction of a cell monitor terminal. The separator for a fuel cell includes a terminal attachment portion which is disposed in a region other than a power generation region engaged in power generation of a separator, and to which a cell monitor terminal capable of detecting the voltage of the single cell is connected, and a conductive carbon thin film layer which is formed on the terminal attachment portion, and the hardness of the carbon thin film layer is greater than or equal to 5 GPa and less than or equal to 10 GPa.
    Type: Application
    Filed: November 11, 2015
    Publication date: May 19, 2016
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tsuyoshi SEGUCHI, Yusuke WATANABE
  • Patent number: 9169542
    Abstract: This invention aims to provide a recycled magnesium alloy having a good corrosion resistance and a process for producing the same. The process of the present invention comprises an adjusting step of adjusting composition of molten metal of a magnesium alloy so as to comprise, by mass: Al: 5 to 10%, Zn: not less than 1% and not less than three times of Cu content (%), Mn: 0.1 to 1.5% and the remainder: Mg and impurities with or without one or more reforming elements. While the upper limit of the Al content is restricted to a low level, the Zn content is increased in accordance with the Cu content. Therefore, the recycled magnesium alloy produced by this process can effectively suppress corrosion caused by Cu, which is one of corrosion-causing elements.
    Type: Grant
    Filed: June 9, 2010
    Date of Patent: October 27, 2015
    Assignees: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroyuki Kawabata, Naohisa Nishino, Sonoko Nishino, Yasushi Iwata, Yoshikazu Genma, Tsuyoshi Seguchi
  • Patent number: 8231742
    Abstract: To provide an iron-based composite material which has higher abrasion and seizure resistance, and more excellent impact absorbing property as compared with a steel material, and which has higher mechanical strength as compared with a cast iron material, and also a method of manufacturing the iron-based composite material. The iron-based composite material includes at least a steel structure layer 12, a cast iron structure layer 14, and a carburized structure layer 13 which is formed by carburizing the steel structure between the steel structure layer 12 and the cast iron structure layer 14.
    Type: Grant
    Filed: November 9, 2007
    Date of Patent: July 31, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Tsuyoshi Seguchi, Masatoshi Oguro
  • Publication number: 20120156087
    Abstract: This invention aims to provide a recycled magnesium alloy having a good corrosion resistance and a process for producing the same. The process of the present invention comprises an adjusting step of adjusting composition of molten metal of a magnesium alloy so as to comprise, by mass: Al: 5 to 10%, Zn: not less than 1% and not less than three times of Cu content (%), Mn: 0.1 to 1.5% and the remainder: Mg and impurities with or without one or more reforming elements. While the upper limit of the Al content is restricted to a low level, the Zn content is increased in accordance with the Cu content. Therefore, the recycled magnesium alloy produced by this process can effectively suppress corrosion caused by Cu, which is one of corrosion-causing elements.
    Type: Application
    Filed: June 6, 2010
    Publication date: June 21, 2012
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO
    Inventors: Hiroyuki Kawabata, Naohisa Nishino, Sonoko Nishino, Yasushi Iwata, Yoshikazu Genma, Tsuyoshi Seguchi
  • Publication number: 20100012228
    Abstract: To provide an iron-based composite material which has higher abrasion and seizure resistance, and more excellent impact absorbing property as compared with a steel material, and which has higher mechanical strength as compared with a cast iron material, and also a method of manufacturing the iron-based composite material. The iron-based composite material includes at least a steel structure layer 12, a cast iron structure layer 14, and a carburized structure layer 13 which is formed by carburizing the steel structure between the steel structure layer 12 and the cast iron structure layer 14.
    Type: Application
    Filed: November 9, 2007
    Publication date: January 21, 2010
    Inventor: Tsuyoshi Seguchi