Patents by Inventor Hideyasu Kawai

Hideyasu Kawai 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: 11702769
    Abstract: A method of producing a stabilized fiber, including performing a heat treatment on an acrylamide polymer fiber under an oxidizing atmosphere in a stabilization treatment temperature range of 200° C. to 500° C. while applying a tension of 0.07 mN/tex to 15 mN/tex.
    Type: Grant
    Filed: September 14, 2020
    Date of Patent: July 18, 2023
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO
    Inventors: Takuya Morishita, Mamiko Narita, Makoto Mouri, Yoshihiro Kikuzawa, Hideyasu Kawai, Nozomu Shigemitsu
  • Publication number: 20220170182
    Abstract: A carbon fiber precursor fiber bundle includes: acrylamide-based polymer fibers, wherein the carbon fiber precursor fiber bundle contains single fibers having a circular cross section in a proportion of 30 to 100%, wherein the circular cross section has a ratio of a major axis to a minor axis of 1.0 to 1.3 in a cross section orthogonal to a longitudinal direction of the single fiber, and a fineness of the single fiber is 0.1 to 7 dtex.
    Type: Application
    Filed: August 10, 2021
    Publication date: June 2, 2022
    Applicants: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takuya MORISHITA, Mamiko NARITA, Mitsumasa MATSUSHITA, Hideyasu KAWAI, Nozomu SHIGEMITSU
  • Publication number: 20210087717
    Abstract: A method of producing a stabilized fiber, including performing a heat treatment on an acrylamide polymer fiber under an oxidizing atmosphere in a stabilization treatment temperature range of 200° C. to 500° C. while applying a tension of 0.07 mN/tex to 15 mN/tex.
    Type: Application
    Filed: September 14, 2020
    Publication date: March 25, 2021
    Inventors: Takuya MORISHITA, Mamiko NARITA, Makoto MOURI, Yoshihiro KIKUZAWA, Hideyasu KAWAI, Nozomu SHIGEMITSU
  • Patent number: 9190632
    Abstract: A power storage device includes a fuel cell (33), a battery holder (1) and an end plate (40) for sandwiching and binding the fuel cell, and an interposed member (11) disposed between the end plate (40) and the fuel cell (33). The battery holder (1) and the end plate (40) are made of resin, and have a positive coefficient of thermal expansion at a temperature lower than a predetermined temperature. The interposed member (11) is formed to have a substantially negative coefficient of thermal expansion at a temperature lower than the predetermined temperature.
    Type: Grant
    Filed: April 3, 2008
    Date of Patent: November 17, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Akira Tsujiko, Koji Takahata, Hironori Harada, Hideyasu Kawai, Hideyuki Yamamura
  • Patent number: 8372562
    Abstract: A conductive carbon carrier for a fuel cell having at least a surface layer graphitized, characterized in that the dimension (La) in a six-membered ring face (carbon plane) direction of a crystallite measured by X-ray diffraction is 4.5 nm or more. This carbon carrier improves the durability in a fuel cell and enables operation for a long period of time.
    Type: Grant
    Filed: March 29, 2007
    Date of Patent: February 12, 2013
    Assignees: Cataler Corporation, Toyota Jidosha Kabushiki Kaisha
    Inventors: Toshiharu Tabata, Tomoaki Terada, Takahiro Nagata, Susumu Enomoto, Yosuke Horiuchi, Hiroaki Takahashi, Tetsuo Kawamura, Hideyasu Kawai
  • Patent number: 8192868
    Abstract: A lithium ion battery before pre-doping includes: a negative electrode member before initial charge having a negative active material before initial charge; a positive electrode member; an electrolyte body; a battery case; and a lithium ion supply body formed by a lithium compound capable of emitting lithium ions when positive voltage is applied to it. The lithium ion supply body is arranged so that it is at least partially in contact with the inner exposed surface of the battery case. The negative electrode member before pre-doping is electrically insulated from the metal case member. The lithium ion supply body and the negative active material before initial charge are respectively in contact with the electrolyte body.
    Type: Grant
    Filed: February 1, 2008
    Date of Patent: June 5, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hideyasu Kawai, Keiichi Kohama, Akira Tsujiko
  • Publication number: 20100136461
    Abstract: A power storage device includes a fuel cell (33), a battery holder (1) and an end plate (40) for sandwiching and binding the fuel cell, and an interposed member (11) disposed between the end plate (40) and the fuel cell (33). The battery holder (1) and the end plate (40) are made of resin, and have a positive coefficient of thermal expansion at a temperature lower than a predetermined temperature. The interposed member (11) is formed to have a substantially negative coefficient of thermal expansion at a temperature lower than the predetermined temperature.
    Type: Application
    Filed: April 3, 2008
    Publication date: June 3, 2010
    Inventors: Akira Tsujiko, Koji Takahata, Hironori Harada, Hideyasu Kawai, Hideyuki Yamamura
  • Publication number: 20100086843
    Abstract: A lithium ion battery before pre-doping includes: a negative electrode member before initial charge having a negative active material before initial charge; a positive electrode member; an electrolyte body; a battery case; and a lithium ion supply body formed by a lithium compound capable of emitting lithium ions when positive voltage is applied to it. The lithium ion supply body is arranged so that it is at least partially in contact with the inner exposed surface of the battery case. The negative electrode member before pre-doping is electrically insulated from the metal case member. The lithium ion supply body and the negative active material before initial charge are respectively in contact with the electrolyte body.
    Type: Application
    Filed: February 1, 2008
    Publication date: April 8, 2010
    Inventors: Hideyasu Kawai, Keiichi Kohama, Akira Tsujiko
  • Publication number: 20090169974
    Abstract: A conductive carbon carrier for a fuel cell having at least a surface layer graphitized, characterized in that the dimension (La) in a six-membered ring face (carbon plane) direction of a crystallite measured by X-ray diffraction is 4.5 nm or more. This carbon carrier improves the durability in a fuel cell and enables operation for a long period of time.
    Type: Application
    Filed: March 29, 2007
    Publication date: July 2, 2009
    Applicants: CATALER CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Toshiharu Tabata, Tomoaki Terada, Takahiro Nagata, Susumu Enomoto, Yosuke Horiuchi, Hiroaki Takahashi, Tetsuo Kawamura, Hideyasu Kawai
  • Publication number: 20090047568
    Abstract: A flooding phenomenon in a high current density loading region of fuel cells is suppressed so as to improve cell performance. An electrode catalyst for fuel cells comprises conductive carriers having ternary catalyst particles, which contain platinum, a base metal element, and iridium, supported thereon. A fuel cell uses the electrode catalyst for fuel cells.
    Type: Application
    Filed: October 13, 2005
    Publication date: February 19, 2009
    Inventors: Hideyasu Kawai, Hiroaki Takahashi, Katsushi Saito, Tomoaki Terada, Takahiro Nagata
  • Publication number: 20090047559
    Abstract: An object of the present invention is to further increase the rate of Pt particles (Pt utilization rate) for three-phase interfaces in order to reduce the amount of catalytic metal such as Pt used for fuel cells. The present invention provides a fuel cell electrode catalyst comprising a conductive carrier and catalytic metal particles, wherein an average particle size of the carried catalytic metal particles is larger than an average pore size of micropores in the conductive carrier.
    Type: Application
    Filed: March 14, 2007
    Publication date: February 19, 2009
    Inventors: Tomoaki Terada, Takahiro Nagata, Toshiharu Tabata, Susumu Enomoto, Hideyasu Kawai, Hiroaki Takahashi
  • Publication number: 20080090128
    Abstract: A flooding phenomenon is suppressed in a high current density loading region so as to attempt the improvement of cell performance of fuel cells. An electrode catalyst for fuel cells, in which a catalyst comprising an alloy catalyst composed of a noble metal and one or more transition metals and having surface characteristics such that it shows a pH value in water of 6.0 or more is supported on conductive carriers, and a fuel cell using such electrode catalyst for fuel cells, are provided.
    Type: Application
    Filed: December 22, 2005
    Publication date: April 17, 2008
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, CATALER CORPORATION
    Inventors: Katsushi Saito, Hiroaki Takahashi, Hideyasu Kawai, Toshiharu Tabata, Takahiro Nagata, Tomoaki Terada, Yosuke Horiuchi, Norihiko Setoyama, Takahiko Asaoka