Patents by Inventor Katsuyoshi Kakinuma

Katsuyoshi Kakinuma 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: 10490827
    Abstract: To spread the use of catalysts for fuel cells, there is a demand to develop a catalyst that uses less Pt and has a high power generation efficiency. An electrode catalyst includes a support particle containing a metal oxide and a precious-metal alloy supported on the support particle. The support particle includes multiple branches, a hole between the branches, and a pore. The pore is surrounded by the branches and the hole. The precious-metal alloy includes a precious metal element and at least one or more transition elements.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: November 26, 2019
    Assignee: UNIVERSITY OF YAMANASHI
    Inventors: Katsuyoshi Kakinuma, Makoto Uchida, Akihiro Iiyama
  • Publication number: 20190341639
    Abstract: A method for forming an electrode catalyst layer by putting catalyst ink within an insulative container having a conductive nozzle in communication with the interior of the container and applying an electrospray voltage to the nozzle to cause electrospray of the catalyst ink through the tip end of the nozzle and thereby to form an electrode catalyst layer, the method includes preparing catalyst ink containing a mixture of at least electrode catalyst, polymer electrolyte binder and volatile organic compound and/or water, putting the catalyst ink within the container with a space remaining inside thereof and air-tightly sealing the container, and electrospraying with the space inside of the air-tightly sealed container being conditioned to have a negative pressure of a level at which the catalyst ink cannot drip off from the nozzle.
    Type: Application
    Filed: July 18, 2019
    Publication date: November 7, 2019
    Inventors: Makoto UCHIDA, Katsuyoshi Kakinuma
  • Publication number: 20190288297
    Abstract: A membrane-electrode assembly including a catalyst layer that includes a catalyst-supporting carrier in which a catalyst is supported on a carrier made of an inorganic oxide, and a highly hydrophobic substance having a higher degree of hydrophobicity than the inorganic oxide, the catalyst layer being formed on at least one surface of a polymer electrolyte membrane. It is preferable that, in the membrane-electrode assembly, the degree of hydrophobicity of the highly hydrophobic substance is from 0.5 vol % to 45 vol % at 25° C., the degree of hydrophobicity being defined as a concentration of methanol (vol %) when a light transmittance of a dispersion obtained by dispersing the highly hydrophobic substance in a mixed solution of water and methanol reaches 80%.
    Type: Application
    Filed: June 6, 2019
    Publication date: September 19, 2019
    Inventors: Koji TANIGUCHI, Masahiro WATANABE, Makoto UCHIDA, Katsuyoshi KAKINUMA
  • Patent number: 10355285
    Abstract: A membrane-electrode assembly including a catalyst layer that includes a catalyst-supporting carrier in which a catalyst is supported on a carrier made of an inorganic oxide, and a highly hydrophobic substance having a higher degree of hydrophobicity than the inorganic oxide, the catalyst layer being formed on at least one surface of a polymer electrolyte membrane. It is preferable that, in the membrane-electrode assembly, the degree of hydrophobicity of the highly hydrophobic substance is from 0.5 vol % to 45 vol % at 25° C., the degree of hydrophobicity being defined as a concentration of methanol (vol %) when a light transmittance of a dispersion obtained by dispersing the highly hydrophobic substance in a mixed solution of water and methanol reaches 80%.
    Type: Grant
    Filed: March 5, 2015
    Date of Patent: July 16, 2019
    Assignees: MITSUI MINING & SMELTING CO., LTD., UNIVERSITY OF YAMANASHI
    Inventors: Koji Taniguchi, Masahiro Watanabe, Makoto Uchida, Katsuyoshi Kakinuma
  • Patent number: 10333152
    Abstract: A fuel cell system and a method of operating the same is provided that is capable of reducing degradation of a cathode catalyst of a fuel cell. A fuel cell system is provided that includes a fuel cell having a catalyst used for an anode, wherein a carrier of the catalyst is composed of a material with a property where electric resistance in an oxygen containing atmosphere is greater than electric resistance in a hydrogen atmosphere; and a control device configured to control the fuel cell, when supply of fuel gas is stopped during stoppage of operation of the fuel cell, to consume all or part of the fuel gas in a fuel gas chamber, followed by introducing oxygen containing gas into the fuel gas chamber.
    Type: Grant
    Filed: August 11, 2016
    Date of Patent: June 25, 2019
    Assignee: UNIVERSITY OF YAMANASHI
    Inventors: Makoto Uchida, Katsuyoshi Kakinuma, Masahiro Watanabe, Akihiro Iiyama
  • Publication number: 20190030514
    Abstract: An electrode catalyst support, capable of improving the power of a fuel cell, and an electrode catalyst and a solid polymer fuel cell using the same. Provided is carbon black wherein pores which are at most 6 nm in pore diameter have a cumulative pore volume of less than 0.25 cm3/g, a specific surface area by BET is 500 to 900 m2/g, and a volatile matter content is 1.0 to 10.0%. Also provided are an electrode catalyst for a fuel cell comprising a support which includes this carbon black, and a solid polymer fuel cell having the electrode catalyst.
    Type: Application
    Filed: November 28, 2016
    Publication date: January 31, 2019
    Applicants: University of Yamanashi, Denka Company Limited
    Inventors: Makoto UCHIDA, Katsuyoshi KAKINUMA, Daiki IKEDA, Yusaku HARADA, Takeshi MIYAKAWA
  • Publication number: 20180175397
    Abstract: A cell includes: a membrane electrode assembly; and a pair of separators. The membrane electrode assembly includes a polymer electrolyte membrane, an anode catalyst layer on a first main surface of the polymer electrolyte membrane, and a cathode catalyst layer on a second main surface. The anode catalyst layer contains a first catalyst material having activity against a hydrogen oxidation reaction and a first electrically conductive material whose electrical resistance under a hydrogen atmosphere and under an oxygen atmosphere are different from each other. The cathode catalyst layer contains a second catalyst material having activity against an oxygen reduction reaction and a second electrically conductive material different from the first electrically conductive material. An electrical resistance of the cell when the anode catalyst layer is under oxygen atmosphere is more than twice the electrical resistance of the cell when the anode catalyst layer is under hydrogen atmosphere.
    Type: Application
    Filed: March 23, 2016
    Publication date: June 21, 2018
    Inventors: Haruhiko SHINTANI, Katsuyoshi KAKINUMA, Makoto UCHIDA, Masahiro WATANABE
  • Patent number: 9989565
    Abstract: The power supply determining part determines whether there is a power supplied from outside of the vehicle to the battery at start-up of the engine. The alarming part alarms to prompt a driver to manually operate the automatic stop control part when it is determined that there is a power supplied from the outside by the power supply determining part.
    Type: Grant
    Filed: July 20, 2017
    Date of Patent: June 5, 2018
    Assignee: HONDA MOTOR CO., LTD.
    Inventors: Katsuyoshi Kakinuma, Minoru Nagasawa
  • Publication number: 20180024173
    Abstract: The power supply determining part determines whether there is a power supplied from outside of the vehicle to the battery at start-up of the engine. The alarming part alarms to prompt a driver to manually operate the automatic stop control part when it is determined that there is a power supplied from the outside by the power supply determining part.
    Type: Application
    Filed: July 20, 2017
    Publication date: January 25, 2018
    Inventors: Katsuyoshi KAKINUMA, Minoru NAGASAWA
  • Publication number: 20170250409
    Abstract: To spread the use of catalysts for fuel cells, there is a demand to develop a catalyst that uses less Pt and has a high power generation efficiency. An electrode catalyst includes a support particle containing a metal oxide and a precious-metal alloy supported on the support particle. The support particle includes multiple branches, a hole between the branches, and a pore. The pore is surrounded by the branches and the hole. The precious-metal alloy includes a precious metal element and at least one or more transition elements.
    Type: Application
    Filed: February 28, 2017
    Publication date: August 31, 2017
    Applicant: UNIVERSITY OF YAMANASHI
    Inventors: Katsuyoshi KAKINUMA, Makoto UCHIDA, Akihiro IIYAMA
  • Publication number: 20170141407
    Abstract: To provide a membrane-electrode assembly including a catalyst layer that includes a catalyst-supporting carrier in which a catalyst is supported on a carrier made of an inorganic oxide, and a highly hydrophobic substance having a higher degree of hydrophobicity than the inorganic oxide, the catalyst layer being formed on at least one surface of a polymer electrolyte membrane. It is preferable that, in the membrane-electrode assembly, the degree of hydrophobicity of the highly hydrophobic substance is from 0.5 vol % to 45 vol % at 25° C., the degree of hydrophobicity being defined as a concentration of methanol (vol %) when a light transmittance of a dispersion obtained by dispersing the highly hydrophobic substance in a mixed solution of water and methanol reaches 80%.
    Type: Application
    Filed: March 5, 2015
    Publication date: May 18, 2017
    Inventors: Koji TANIGUCHI, Masahiro WATANABE, Makoto UCHIDA, Katsuyoshi KAKINUMA
  • Publication number: 20170047600
    Abstract: A fuel cell system and a method of operating the same is provided that is capable of reducing degradation of a cathode catalyst of a fuel cell. A fuel cell system is provided that includes a fuel cell having a catalyst used for an anode, wherein a carrier of the catalyst is composed of a material with a property where electric resistance in an oxygen containing atmosphere is greater than electric resistance in a hydrogen atmosphere; and a control device configured to control the fuel cell, when supply of fuel gas is stopped during stoppage of operation of the fuel cell, to consume all or part of the fuel gas in a fuel gas chamber, followed by introducing oxygen containing gas into the fuel gas chamber.
    Type: Application
    Filed: August 11, 2016
    Publication date: February 16, 2017
    Applicant: UNIVERSITY OF YAMANASHI
    Inventors: Makoto UCHIDA, Katsuyoshi KAKINUMA, Masahiro WATANABE, Akihiro IIYAMA
  • Publication number: 20120295184
    Abstract: Disclosed is an oxide and/or nitride support for electrode catalysts, which is used for electrodes for polymer electrolyte fuel cells (PEFC). The support for electrode catalysts is an aggregation body of primary particles of oxide of at least one kind of metal selected from rare earths, alkaline earths, transition metals, niobium, bismuth, tin, antimony, zirconium, molybdenum, indium, tantalum, and tungsten, and the aggregation body is configured such that at least 80% of the metal oxide primary particles having a size of 5 nm to 100 nm aggregate and bind each other to form dendritic or chain structures each of which is made of 5 or more of the metal oxide primary particles.
    Type: Application
    Filed: November 26, 2010
    Publication date: November 22, 2012
    Inventors: Masahiro Watanabe, Katsuyoshi Kakinuma, Makoto Uchida, Takeo Kamino, Hiroyuki Uchida