Patents by Inventor Kohei Kita

Kohei Kita 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: 10538213
    Abstract: A vehicle frame member includes a first wall portion formed into a band plate shape extending in a predetermined direction, a second wall portion and a third wall portion formed into a band plate shape extending in the predetermined direction, the second wall portion and the third wall portion extending in a first direction and in a second direction, respectively, from opposite ends of the first wall portion in a width direction of the first wall portion. Respective recessed groove portions extending in the predetermined direction are formed on respective outer surfaces of the second wall portion and the third wall portion.
    Type: Grant
    Filed: November 22, 2017
    Date of Patent: January 21, 2020
    Assignees: Aisin Seiki Kabushiki Kaisha, Aisin Keikinzoku Kabushiki Kaisha
    Inventors: Kohei Hodoya, Kiyoichi Kita, Jun Shobo
  • Patent number: 9468924
    Abstract: The disclosure includes a method for producing a dispersion composition of fluorine-containing ion exchange resin comprising a copolymer represented by formula: wherein x and y represent numbers satisfying 0?x<1, 0?y<1, and x+y=1; Z represents H, Cl, F, or a perfluoroalkyl group having 1 to 3 carbon atoms; m represents an integer of 0 to 12; and n represents an integer of 0 to 2.
    Type: Grant
    Filed: December 13, 2012
    Date of Patent: October 18, 2016
    Assignee: Asahi Kasei E-materials Corporation
    Inventors: Takahiko Murai, Kohei Kita, Naoki Sakamoto
  • Patent number: 8993682
    Abstract: The present invention provides an electrolyte having high conductivity even under high-temperature low-humidification conditions (e.g. at a temperature of 100 to 120° C. and a humidity of 20 to 50% RH) and thereby makes it possible to realize a higher performance fuel cell. The present invention is a fluoropolymer electrolyte having an equivalent weight (EW) of not less than 250 but not more than 700 and a proton conductivity of not lower than 0.10 S/cm as measured at a temperature of 110° C. and a relative humidity of 50% RH and comprising a COOZ group- or SO3Z group-containing monomer unit, wherein Z represents an alkali metal, an alkaline earth metal, hydrogen atom or NR1R2R3R4 in which R1, R2, R3 and R4 each independently represents an alkyl group containing 1 to 3 carbon atoms or hydrogen atom.
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: March 31, 2015
    Assignees: Asahi Kasei E-Materials Corporation, Daikin Industries, Ltd.
    Inventors: Kohei Kita, Takahiko Murai, Naoki Sakamoto, Naoto Miyake, Tadashi Ino, Noriyuki Shinoki, Masaharu Nakazawa, Masahiro Kondo, Takashi Yoshimura
  • Patent number: 8685591
    Abstract: A dispersion composition including a fluorine-containing ion exchange resin having a repeating unit represented by the formulae (1) and a repeating unit represented by the formulae (2), and having an equivalent weight of 400 to 1000 g/eq; and a solvent comprising water, wherein Z represents H, Cl, F, or a perfluoroalkyl group having 1 to 3 carbon atoms; m represents an integer of 0 to 12; and n represents an integer of 0 to 2, and wherein an abundance ratio of a resin having a particle size of 10 ?m or more in the fluorine-containing ion exchange resin is 0.1% to 80% by volume.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: April 1, 2014
    Assignee: Asahi Kasei E-materials Corporation
    Inventors: Takahiko Murai, Kohei Kita, Naoki Sakamoto
  • Patent number: 8465856
    Abstract: A polymer electrolyte-containing solution is obtained by preparing a first solution, preparing a second solution and mixing the first and second solutions. The first solution is prepared by dissolving a perfluorocarbonsulfonic acid resin (component A) having an ion-exchange capacity of 0.5 to 3.0 meq/g in a protic solvent. The second solution is prepared separate from the first solution, by dissolving a polyazole-based compound (component B) and an alkali metal hydroxide in a protic solvent. The first and second solutions are mixed to prepare a polymer electrolyte-containing solution in which a weight ratio of the component A to component B, (A/B) , is from 2:3 to 199 and a total weight of the component A and the component B is from 0.5 to 30% by weight on the basis of the solution including the protic solvent. The protic solvent is an aliphatic alcohol.
    Type: Grant
    Filed: August 26, 2010
    Date of Patent: June 18, 2013
    Assignee: Asahi Kasei Chemicals Corporation
    Inventors: Yoshinori Yanagita, Kohei Kita, Naoki Sakamoto, Takehiro Koga
  • Publication number: 20110027684
    Abstract: Problems to be Solved There is provided a dispersion composition of fluorine-containing ion exchange resin, which has an extremely low solution viscosity even in a case in which the concentration of a fluorine-containing ion exchange resin is increased by a concentration operation in a liquid composition in which the fluorine-containing ion exchange resin is dispersed. Solution A dispersion composition of fluorine-containing ion exchange resin, which comprises a fluorine-containing ion exchange resin having a repeating unit represented by the following formulae (1) and (2) and having an equivalent weight of 400 to 1000 g/eq, and a solvent containing water, wherein Z represents H, Cl, F, or a perfluoroalkyl group containing 1 to 3 carbon atoms; m represents an integer of 0 to 12; and n represents an integer of 0 to 2, and wherein an abundance ratio of a resin having a particle size of 10 ?m or more in the fluorine-containing ion exchange resin is 0.1% to 80% by volume.
    Type: Application
    Filed: March 31, 2009
    Publication date: February 3, 2011
    Inventors: Takahiko Murai, Kohei Kita, Naoki Sakamoto
  • Publication number: 20110020728
    Abstract: The present invention provides an electrolyte having high conductivity even under high-temperature low-humidification conditions (e.g. at a temperature of 100 to 120° C. and a humidity of 20 to 50% RH) and thereby makes it possible to realize a higher performance fuel cell. The present invention is a fluoropolymer electrolyte having an equivalent weight (EW) of not less than 250 but not more than 700 and a proton conductivity of not lower than 0.10 S/cm as measured at a temperature of 110° C. and a relative humidity of 50% RH and comprising a COOZ group- or SO3Z group-containing monomer unit, wherein Z represents an alkali metal, an alkaline earth metal, hydrogen atom or NR1R2R3R4 in which R1, R2, R3 and R4 each independently represents an alkyl group containing 1 to 3 carbon atoms or hydrogen atom.
    Type: Application
    Filed: March 12, 2009
    Publication date: January 27, 2011
    Applicants: Asahi Kasei E-Materials Corporation, Daikin Industries, Ltd.
    Inventors: Kohei Kita, Takahiko Murai, Naoki Sakamoto, Naoto Miyake, Tadashi Ino, Noriyuki Shinoki, Masaharu Nakazawa, Masahiro Kondo, Takashi Yoshimura
  • Publication number: 20100330456
    Abstract: An object is to provide a solid polymer electrolyte membrane for solid polymer electrolyte fuel cell, which has high durability, as well as a membrane electrode assembly and a solid polymer electrolyte fuel cell, each containing the same. The solid polymer electrolyte membrane is produced using polymer electrolyte-containing solution preparation step of dissolving a perfluorocarbonsulfonic acid resin (component A) having an ion-exchange capacity of 0.5 to 3.0 meq/g, a polyazole-based compound (component B) and an alkali metal hydroxide in a protic solvent to prepare a polymer electrolyte-containing solution in which a weight ratio of the component A to component B, (A/B), is from 2.3 to 199 and a total weight of the component A and the component B is from 0.5 to 30% by weight. In a membrane formation step, a membrane is formed from the polymer electrolyte-containing solution.
    Type: Application
    Filed: August 26, 2010
    Publication date: December 30, 2010
    Applicant: ASAHI KASEI CHEMICALS CORPORATION
    Inventors: Yoshinori Yanagita, Kohei Kita, Naoki Sakamoto, Takehiro Koga
  • Patent number: 7799452
    Abstract: An object is to provide a solid polymer electrolyte membrane for solid polymer electrolyte fuel cell, which has high durability, as well as a membrane electrode assembly and a solid polymer electrolyte fuel cell, each containing the same. The solid polymer electrolyte membrane is produced using polymer electrolyte-containing solution preparation step of dissolving a perfluorocarbonsulfonic acid resin (component A) having an ion-exchange capacity of 0.5 to 3.0 meq/g, a polyazole-based compound (component B) and an alkali metal hydroxide in a protic solvent to prepare a polymer electrolyte-containing solution in which a weight ratio of the component A to component B, (A/B), is from 2.3 to 199 and a total weight of the component A and the component B is from 0.5 to 30% by weight. In a membrane formation step, a membrane is formed from the polymer electrolyte-containing solution.
    Type: Grant
    Filed: September 9, 2005
    Date of Patent: September 21, 2010
    Assignee: Asahi Kasei Chemicals Corporation
    Inventors: Yoshinori Yanagita, Kohei Kita, Naoki Sakamoto, Takehiro Koga
  • Publication number: 20060199062
    Abstract: An object of the present invention is to provide a solid polymer electrolyte membrane in which a polyazole-based compound is uniformly mixed with a perfluorocarbonsulfonic acid resin. Thus, the present invention provides a solid polymer electrolyte membrane for solid polymer electrolyte fuel cell, which has high durability, as well as a membrane electrode assembly and a solid polymer electrolyte fuel cell, each containing the same. The inventive solid polymer electrolyte membrane is produced by a method which comprises a polymer electrolyte-containing solution preparation step of dissolving a perfluorocarbonsulfonic acid resin (component A) having an ion-exchange capacity of 0.5 to 3.0 meq/g, a polyazole-based compound (component B) and an alkali metal hydroxide in a protic solvent to prepare a polymer electrolyte-containing solution in which a weight ratio of the component A to component B, (A/B), is from 2.3 to 199 and a total weight of the component A and the component B is from 0.
    Type: Application
    Filed: September 9, 2005
    Publication date: September 7, 2006
    Applicant: ASAHI KASEI CHEMICALS CORPORATION
    Inventors: Yoshinori Yanagita, Kohei Kita, Naoki Sakamoto, Takehiro Koga
  • Patent number: 6323300
    Abstract: Disclosed is an aromatic copolymer comprising a plurality of aromatic copolymer chains, each comprising (A) recurring 2,6-diphenylphenol units and (B) phenolic comonomer units, each comonomer unit being independently selected from the group consisting of (i) an oxyphenylene monomer unit which is monosubstituted with a monovalent aromatic group or a halogen atom, (ii) an &agr;-oxynaphthylene monomer unit, (iii) a &bgr;-oxynaphthylene monomer unit, and (iv) an oxyphenylene monomer unit which is substituted with at least one aliphatic group, wherein the amounts of (A) and (B) are from 50 to 98% by weight and from 2 to 50% by weight, based on the weight of the aromatic copolymer, provided that, when (iv) is present as the comonomer unit, the amount of (iv) is 20% by weight or less, based on the weight of (B), and wherein the aromatic copolymer has a weight average molecular weight of from 1,000 to 3,000,000. A method for producing the aromatic copolymer is also disclosed.
    Type: Grant
    Filed: May 21, 1999
    Date of Patent: November 27, 2001
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Kohei Kita, Tsuneaki Tanabe, Mitsuo Konishi