Patents by Inventor Naoki Takehiro

Naoki Takehiro 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).

  • Publication number: 20140114628
    Abstract: A particle size distribution creating method includes a particle size range determining step, an integrating step of integrating the frequency of appearance of particles within the particle size range determined in the particle size range determining step, a division point determining step of determining particle sizes that provide division points, using the integral of the frequency of appearance obtained in the integrating step, and a typical point determining step of determining the minimum particle size, maximum particle size and the particle sizes of the division points as typical points.
    Type: Application
    Filed: January 7, 2014
    Publication date: April 24, 2014
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroko Kimura, Naoki Takehiro, Manabu Kato, Kazutaka Kimura
  • Patent number: 8660827
    Abstract: A particle size distribution creating method includes a particle size range determining step, an integrating step of integrating the frequency of appearance of particles within the particle size range determined in the particle size range determining step, a division point determining step of determining particle sizes that provide division points, using the integral of the frequency of appearance obtained in the integrating step, and a typical point determining step of determining the minimum particle size, maximum particle size and the particle sizes of the division points as typical points.
    Type: Grant
    Filed: March 31, 2010
    Date of Patent: February 25, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hiroko Kimura, Naoki Takehiro, Manabu Kato, Kazutaka Kimura
  • Publication number: 20130189607
    Abstract: A catalyst particle is composed of an inner particle and an outermost layer that includes platinum and covers the inner particle. The inner particle includes on at least a surface thereof a first oxide having an oxygen defect.
    Type: Application
    Filed: October 6, 2011
    Publication date: July 25, 2013
    Inventors: Go Sakai, Tatsuya Arai, Tetsuya Ogawa, Koshi Sekizawa, Naoki Takehiro
  • Publication number: 20130059219
    Abstract: A fuel cell system which prevents a reduction in catalyst activity, wherein at least one of the anode catalyst layer and the cathode catalyst layer includes a core-shell type catalyst particle having a core portion including a core metallic material and a shell portion covering the core portion and including a shell metallic material; and wherein the fuel cell system has: a means for storing an initial value of a ratio of the core metallic material to a surface area of the core-shell type catalyst particle, and a means for determining whether or not the ratio of the core metallic material to the surface area of the core-shell type catalyst particle is increased at a predetermined stage, compared to the initial value.
    Type: Application
    Filed: May 25, 2010
    Publication date: March 7, 2013
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroko Kimura, Atsuo Iio, Naoki Takehiro, Tatsuya Arai, Koshi Sekizawa
  • Publication number: 20130029842
    Abstract: The present invention provides core-shell type metal nanoparticles having a high surface coverage of the core portion with the shell portion, and a method for producing the same. Disclosed is core-shell type metal nanoparticles comprising a core portion comprising a core metal material and a shell portion covering the core portion, wherein the core portion substantially has no {100 } plane of the core metal material on the surface thereof.
    Type: Application
    Filed: April 7, 2010
    Publication date: January 31, 2013
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroko Kimura, Naoki Takehiro, Koshi Sekizawa, Atsuo Iio, Tatsuya Arai
  • Publication number: 20130029248
    Abstract: A fuel cell including a single fuel cell which includes a membrane electrode including a polymer electrolyte membrane, an anode electrode on one surface of the polymer electrolyte membrane, and a cathode electrode on another surface of the polymer electrolyte membrane, the anode electrode including an anode catalyst layer and a gas diffusion layer and the cathode electrode including a cathode catalyst layer and a gas diffusion layer. At least one of the anode cathode catalyst layers includes core-shell type catalyst particles, each having a core and a shell covering the core and including a shell metallic material. At least one of the polymer electrolyte membrane, anode catalyst layer, gas diffusion layer at the anode side, cathode catalyst layer and gas diffusion layer at the cathode side includes metallic nanoparticles having an average particle diameter different from that of the core-shell type catalyst particles and including the shell metallic material.
    Type: Application
    Filed: April 7, 2010
    Publication date: January 31, 2013
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tatsuya Arai, Naoki Takehiro, Atsuo Iio, Koshi Sekizawa, Hiroko Kimura
  • Publication number: 20130022899
    Abstract: Core-shell type metal nanoparticles including a core portion and a shell portion covering the core portion, wherein the core portion includes a core metal material selected from metals and alloys, and wherein the shell portion includes an alloy of a first shell metal material and a second shell metal material.
    Type: Application
    Filed: April 7, 2010
    Publication date: January 24, 2013
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tatsuya Arai, Naoki Takehiro, Atsuo Iio, Hiroko Kimura
  • Publication number: 20120208105
    Abstract: Disclosed is a catalyst particle having high catalyst activity and a method for producing the catalyst particle. A catalyst particle comprising a core particle which contains a palladium alloy and an outermost layer which contains platinum, wherein an interlayer comprising only palladium as a simple substance is present between the core particle and the outermost layer.
    Type: Application
    Filed: July 21, 2010
    Publication date: August 16, 2012
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tatsuya Arai, Naoki Takehiro, Koshi Sekizawa, Hiroko Kimura, Atsuo Iio
  • Patent number: 8221932
    Abstract: A fuel cell 10 includes an MEA 200, an anode separator 100 and a cathode separator 300. The anode separator 100 forms alternate first and second flow channels 110 and 120. The first flow channel 110 is blocked in the middle. The second flow channel 120 is blocked in the both ends. The anode separator 300 forms alternate first and second flow channels 310 and 320. The first flow channel 310 is blocked in the middle. The second flow channel 320 is blocked in the both ends.
    Type: Grant
    Filed: January 20, 2010
    Date of Patent: July 17, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Naoki Takehiro, Shinji Jomori, Takumi Taniguchi, Keiichi Kaneko, Tatsuya Arai
  • Patent number: 8163432
    Abstract: The present invention provides a fuel cell capable of inhibiting desiccation and flooding of a membrane electrode assembly. The fuel cell has a laminated body having a membrane electrode assembly including an electrolyte membrane sandwiched by an anode catalyst layer and a cathode catalyst layer. A pair of separators sandwiches the laminated body, and between at least one separator and the laminated body, inlet and outlet passages are formed. The inlet passage is blocked at a downstream end of the reaction gas supplied to the laminated body and the outlet passage is blocked at an upstream end of the reaction gas having passed through the laminated body. The inlet passage and the outlet passage are arranged separately from each other. The depth of the upstream region of the inlet passage is larger than that of the downstream region of the inlet passage.
    Type: Grant
    Filed: December 12, 2008
    Date of Patent: April 24, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Shinji Jomori, Naoki Takehiro, Tatsuya Arai, Keiichi Kaneko, Takumi Taniguchi
  • Patent number: 8129070
    Abstract: The present invention provides a fuel cell having obstructed passages, which is capable of inhibiting the occurrence of flooding. The fuel cell comprises: a stacked body comprising at least a membrane electrode assembly; and a pair of separators sandwiching the stacked body. A face of the stacked body side of the separator is provided with inlet passage(s) through which reaction gas to be supplied to the stacked body passes and outlet passage(s) through which reaction gas having passed the stacked body passes. The inlet passage is obstructed at a downstream end of the reaction gas to be supplied to the stacked body and the outlet passage is obstructed at an upstream end of the reaction gas having passed through the stacked body. The inlet passage and the outlet passage is arranged separately from each other, and the inlet passage is arranged on both ends of the face of the stacked body side of the separator in the passage width direction of the inlet passage and the outlet passage.
    Type: Grant
    Filed: December 12, 2008
    Date of Patent: March 6, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Shinji Jomori, Naoki Takehiro, Tatsuya Arai, Keiichi Kaneko, Takumi Taniguchi
  • Publication number: 20120010069
    Abstract: A method of producing a core-shell catalyst particle, the method including: preparing a core particle that contains an alloy including a first core metal having a standard electrode potential of at least 0.6 V and a second core metal having a standard electrode potential lower than that of the first core metal; eluting the second core metal at least at a surface of the core particle, the elution being carried out under conditions at which an equilibrium is maintained for the first core metal between a metal state and a hydroxide and at which an equilibrium is maintained for the second core metal between a metal state and a metal ion; and, with the core particle being designed as a core portion, coating this core portion with a shell portion after the elution of the second core metal.
    Type: Application
    Filed: July 11, 2011
    Publication date: January 12, 2012
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Naoki TAKEHIRO, Hiroko KIMURA, Tatsuya ARAI, Atsuo IIO
  • Publication number: 20120003562
    Abstract: A fuel cell 10 includes an MEA 200, an anode separator 100 and a cathode separator 300. The anode separator 100 forms alternate first and second flow channels 110 and 120. The first flow channel 110 is blocked in the middle. The second flow channel 120 is blocked in the both ends. The anode separator 300 forms alternate first and second flow channels 310 and 320. The first flow channel 310 is blocked in the middle. The second flow channel 320 is blocked in the both ends.
    Type: Application
    Filed: January 20, 2010
    Publication date: January 5, 2012
    Applicants: UTC POWER CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Naoki Takehiro, Shinji Jomori, Takumi Taniguchi, Keiichi Kaneko, Tatsuya Arai
  • Publication number: 20110236787
    Abstract: The present invention provides a fuel cell having obstructed passages, which is capable of inhibiting the occurrence of flooding. The fuel cell comprises: a stacked body comprising at least a membrane electrode assembly; and a pair of separators sandwiching the stacked body. A face of the stacked body side of the separator is provided with inlet passage(s) through which reaction gas to be supplied to the stacked body passes and outlet passage(s) through which reaction gas having passed the stacked body passes. The inlet passage is obstructed at a downstream end of the reaction gas to be supplied to the stacked body and the outlet passage is obstructed at an upstream end of the reaction gas having passed through the stacked body. The inlet passage and the outlet passage is arranged separately from each other, and the inlet passage is arranged on both ends of the face of the stacked body side of the separator in the passage width direction of the inlet passage and the outlet passage.
    Type: Application
    Filed: December 12, 2008
    Publication date: September 29, 2011
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Shinji Jomori, Naoki Takehiro, Tatsuya Arai, Keiichi Kaneko, Takumi Taniguchi
  • Publication number: 20110183238
    Abstract: The present invention provides a fuel cell which is capable of improving electric power generation efficiency at a time of high-temperature operation. The fuel cell 10 comprising: a membrane electrode assembly 4; and a pair of gas separators 7, 8 sandwiching the membrane electrode assembly 4 therebetween, wherein at least one of the gas separator(s) 7 and/or 8 comprises a compact layer(s) 7c and/or 8c which is capable of preventing permeation of fluid and a porous layer (s) 7d and/or 8d which allows permeation of fluid, and the porous layer(s) 7d and/or 8d is impregnated with a water-soluble liquid having higher boiling point than that of water.
    Type: Application
    Filed: October 10, 2008
    Publication date: July 28, 2011
    Applicants: TOYOTA JODOSHA KABUSHIKI KAISHA, UTC POWER CORPORATION
    Inventors: Hiroko Kimura, Naoki Takehiro
  • Publication number: 20110123896
    Abstract: The present invention provides a fuel cell having a blocked passage and showing capability of inhibiting desiccation and flooding of the membrane electrode assembly.
    Type: Application
    Filed: December 12, 2008
    Publication date: May 26, 2011
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Shinji Jomori, Naoki Takehiro, Tatsuya Arai, Keiichi Kaneko, Takumi Taniguchi
  • Publication number: 20100248046
    Abstract: A particle size distribution creating method includes a particle size range determining step, an integrating step of integrating the frequency of appearance of particles within the particle size range determined in the particle size range determining step, a division point determining step of determining particle sizes that provide division points, using the integral of the frequency of appearance obtained in the integrating step, and a typical point determining step of determining the minimum particle size, maximum particle size and the particle sizes of the division points as typical points.
    Type: Application
    Filed: March 31, 2010
    Publication date: September 30, 2010
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hiroko Kimura, Naoki Takehiro, Manabu Kato, Kazutaka Kimura