Patents by Inventor Junko Nakao

Junko Nakao 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).

  • Polyarylene ether compound containing sulfonic acid group, composition containing same, and method for manufacturing those
    Patent number: 7754844
    Abstract: A polyarylene ether-based compound according to the present invention includes polymer components represented in general formula (1) and general formula (2): wherein Ar indicates a divalent aromatic group, Y indicates a sulfone group or a ketone group, X indicates H or a monovalent cation species, and Ar? indicates a divalent aromatic group.
    Type: Grant
    Filed: October 7, 2003
    Date of Patent: July 13, 2010
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Yoshimitsu Sakaguchi, Kota Kitamura, Shigenori Nagahara, Masahiro Yamashita, Junko Nakao
  • Composite ion exchange membrane and electrolyte membrane electrode assembly
    Patent number: 7537852
    Abstract: The present invention provides a composite ion exchange membrane which has high mechanical strength and is suitable for use as a solid polymer electrolyte membrane excellent in ionic conductivity and a method for its production. The invention is achieved by a composite ion exchange membrane including a composite layer comprising a support membrane with continuous voids formed of polybenzazole polymer, the support membrane being impregnated with ion exchange resin, and surface layers formed of ion exchange resin free of support membranes, the surface layers being formed on both surfaces of the composite layer so as to sandwich the composite layer therebetween.
    Type: Grant
    Filed: February 3, 2003
    Date of Patent: May 26, 2009
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Shiro Hamamoto, Satoshi Takase, Yoshimitsu Sakaguchi, Shigenori Nagahara, Kota Kitamura, Junko Nakao, Kousuke Sasai
  • Polybenzazole compound having sulfonic acid group and/or phosphonic acid group, resin composition containing the same, resin molding, solid polymer electrolyte membrane, solid polymer electrolyte membrane/electrode assembly and method of preparing assembly
    Patent number: 7288603
    Abstract: An object of the present invention is to obtain a novel polymeric material capable of forming a solid polymer electrolyte excellent not only in processability, solvent resistance and durability/stability but also in ion conductivity by introducing sulfonic acid group or phosphonic acid group into a polybenzazole compound having excellent properties in view of heat resistance, solvent resistance, mechanical characteristics and the like. Means attaining the object of the present invention is a polybenzazole compound including an aromatic dicarboxylic acid bond unit having sulfonic acid group and/or phosphonic acid group and satisfying either a condition that inherent viscosity measured in concentrated sulfuric acid is in the range of 0.25 to 10 dl/g or a condition that inherent viscosity measured in a methanesulfonic acid solution is in the range of 0.1 to 50 dl/g.
    Type: Grant
    Filed: November 12, 2001
    Date of Patent: October 30, 2007
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Yoshimitsu Sakaguchi, Kota Kitamura, Hiroaki Taguchi, Junko Nakao, Shiro Hamamoto, Hiroshi Tachimori, Satoshi Takase
  • Polyarylene ether compound containing sulfonic acid group, composition containing same, and method for manufacturing those
    Publication number: 20060166048
    Abstract: A polyarylene ether-based compound according to the present invention includes polymer components represented in general formula (1) and general formula (2): wherein Ar indicates a divalent aromatic group, Y indicates a sulfone group or a ketone group, X indicates H or a monovalent cation species, and Ar? indicates a divalent aromatic group.
    Type: Application
    Filed: October 7, 2003
    Publication date: July 27, 2006
    Inventors: Yoshimitsu Sakaguchi, Kota Kitamura, Shigenori Nagahara, Masahiro Yamashita, Junko Nakao
  • Cluster ion exchange membrane and electrolyte membrane electrode connection body
    Publication number: 20050095486
    Abstract: The present invention provides a composite ion exchange membrane which has high mechanical strength and is suitable for use as a solid polymer electrolyte membrane excellent in ionic conductivity and a method for its production. The invention is achieved by a composite ion exchange membrane including a composite layer comprising a support membrane with continuous voids formed of polybenzazole polymer, the support membrane being impregnated with ion exchange resin, and surface layers formed of ion exchange resin free of support membranes, the surface layers being formed on both surfaces of the composite layer so as to sandwich the composite layer therebetween.
    Type: Application
    Filed: February 3, 2003
    Publication date: May 5, 2005
    Inventors: Shiro Hamamoto, Satoshi Takase, Yoshimitsu Sakaguchi, Shigenori Nagahara, Kota Kitamura, Junko Nakao, Kousuke Sasai
  • Polybenzazole compound having sulfo group and/or phosphono group, resin composition containing the same, molded resin, slid polymer electrolyte film, solid electrolyte film/electrode catalyst layer composite, and process for producing the composite
    Publication number: 20040062969
    Abstract: An object of the present invention is to obtain a novel polymeric material capable of forming a solid polymer electrolyte excellent not only in processability, solvent resistance and durability/stability but also in ion conductivity by introducing sulfonic acid group or phosphonic acid group into a polybenzazole compound having excellent properties in view of heat resistance, solvent resistance, mechanical characteristics and the like.
    Type: Application
    Filed: October 28, 2003
    Publication date: April 1, 2004
    Inventors: Yoshimitsu Sakaguchi, Kota Kitamura, Hiroaki Taguchi, Junko Nakao, Shiro Hamamoto, Hiroshi Tachimori, Satoshi Takase