Patents by Inventor Yasuaki Kitajima

Yasuaki Kitajima 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: 8641047
    Abstract: A fluororubber-metal laminate gasket material, which comprises a metallic steel sheet, a zirconium element-, phosphorus element-, and aluminum element-containing surface-treating agent layer, a silica-containing thermosetting phenol resin-based vulcanizing adhesive layer, and a fluororubber layer, as successively laid upon one another on the metallic steel sheet, where the silica-containing thermosetting phenol-based vulcanizing adhesive is a thermosetting phenol resin-based vulcanizing adhesive comprising silica and cresol novolak-type epoxy resin or phenol novolak-type epoxy resin, and further containing 11-80 parts by weight of an aliphatic amine-based compound or a mixture thereof with an imidazole-based compound as a curing accelerator on the basis of 100 parts by weight of the thermosetting phenol resin, where the aliphatic amine-based compound and the imidazol-based compound are in a proportion of the former to the latter of 100-10 wt. % to 0-90 wt. %.
    Type: Grant
    Filed: December 10, 2008
    Date of Patent: February 4, 2014
    Assignee: NOK Corporation
    Inventors: Yasuaki Kitajima, Kiyofumi Fukasawa
  • Patent number: 8475917
    Abstract: A fluororubber-metal laminate sheet, which comprises a metallic sheet and a vulcanized fluorocarbon layer, provided on the metallic sheet by applying thereto a fluororubber composition comprising (A) 100 parts by weight of a polyol-vulcanizable fluororubber, (B) 10-50 parts by weight of amorphous graphite, (C) 1-15 parts by weight of a phenol resin, (D) 1-4 parts by weight of a silane coupling agent, (E) 0.5-8 parts by weight of a polyol-based vulcanizing agent, and (F) 0.5-6 parts by weight of a vulcanizing accelerator, followed by vulcanization of the fluororubber composition to form laminate, where the metallic sheet is free from either a chromating treatment or a chromating substitute treatment, is distinguished in characteristics such as sealability, compression resistance, air-heated aging resistance, anti-freezing liquid resistance, oil resistance, sticking resistance, abrasion resistance, etc.
    Type: Grant
    Filed: August 27, 2009
    Date of Patent: July 2, 2013
    Assignee: NOK Corporation
    Inventors: Atsushi Yokota, Toshihiro Higashira, Yasuaki Kitajima
  • Publication number: 20110143124
    Abstract: A fluororubber-metal laminate sheet, which comprises a metallic sheet and a vulcanized fluorocarbon layer, provided on the metallic sheet by applying thereto a fluororubber composition comprising (A) 100 parts by weight of a polyol-vulcanizable fluororubber, (B) 10-50 parts by weight of amorphous graphite, (C) 1-15 parts by weight of a phenol resin, (D) 1-4 parts by weight of a silane coupling agent, (E) 0.5-8 parts by weight of a polyol-based vulcanizing agent, and (F) 0.5-6 parts by weight of a vulcanizing accelerator, followed by vulcanization of the fluororubber composition to form laminate, where the metallic sheet is free from either a chromating treatment or a chromating substitute treatment, is distinguished in characteristics such as sealability, compression resistance, air-heated aging resistance, anti-freezing liquid resistance, oil resistance, sticking resistance, abrasion resistance, etc.
    Type: Application
    Filed: August 27, 2009
    Publication date: June 16, 2011
    Applicant: NOK CORPORATION
    Inventors: Atsushi Yokota, Toshihiro Higashira, Yasuaki Kitajima
  • Publication number: 20110012315
    Abstract: A fluororubber-metal laminate gasket material, which comprises a metallic steel sheet, a zirconium element-, phosphorus element-, and aluminum element-containing surface-treating agent layer, a silica-containing thermosetting phenol resin-based vulcanizing adhesive layer, and a fluororubber layer, as successively laid upon one another on the metallic steel sheet, where the silica-containing thermosetting phenol-based vulcanizing adhesive is a thermosetting phenol resin-based vulcanizing adhesive comprising silica and cresol novolak-type epoxy resin or phenol novolak-type epoxy resin, and further containing 11-80 parts by weight of an aliphatic amine-based compound or a mixture thereof with an imidazole-based compound as a curing accelerator on the basis of 100 parts by weight of the thermosetting phenol resin, where the aliphatic amine-based compound and the imidazol-based compound are in a proportion of the former to the latter of 100-10 wt. % to 0-90 wt. %.
    Type: Application
    Filed: December 10, 2008
    Publication date: January 20, 2011
    Applicant: NOK CORPORATION
    Inventors: Yasuaki Kitajima, Kiyofumi Fukasawa
  • Patent number: 6663705
    Abstract: A vulcanizing adhesive composition comprising a copolymerization oligomer of amino group-containing alkoxysilane and vinyl group-containing alkoxysilane, a nonionic surfactant of HLB 10-16 and an acid compound is an aqueous vulcanizing adhesive composition free from an organic solvent and for use in bonding of fluororubber to a metal, which is also effectively applicable to any of polyol-vulcanizable fluororubber and peroxide-vulcanizable fluororubber, showing a good adhesiveness even to stainless steel of poor wettability toward the conventional aqueous adhesive.
    Type: Grant
    Filed: April 23, 2002
    Date of Patent: December 16, 2003
    Assignee: NOK Corporation
    Inventors: Kiyohumi Fukasawa, Yasuaki Kitajima
  • Publication number: 20030004295
    Abstract: A vulcanizing adhesive composition comprising a copolymerization oligomer of amino group-containing alkoxysilane and vinyl group-containing alkoxysilane, a nonionic surfactant of HLB 10-16 and an acid compound is an aqueous vulcanizing adhesive composition free from an organic solvent and for use in bonding of fluororubber to a metal, which is also effectively applicable to any of polyol-vulcanizable fluororubber and peroxide-vulcanizable fluororubber, showing a good adhesiveness even to stainless steel of poor wettability toward the conventional aqueous adhesive.
    Type: Application
    Filed: April 23, 2002
    Publication date: January 2, 2003
    Inventors: Kiyohumi Fukasawa, Yasuaki Kitajima