Patents by Inventor Takeo Hamazaki

Takeo Hamazaki 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).

  • Acrylonitrile copolymer, and fiber or core-sheath conjugate fiber prepared therefrom
    Patent number: 5264531
    Abstract: The present invention relates to an acrylonitrile copolymer comprising 70% by weight or more of an acrylonitrile monomer unit and 0.1-30% by weight of a fluoroalkyl methacrylate or fluoroalkyl acrylate monomer unit and having an intrinsic viscosity of 0.8-10, as well as to an acrylonitrile type core-sheath conjugate fiber using the above copolymer as the sheath component. The copolymer according to the present invention has water repellency by itself; accordingly, the above conjugate fiber prepared therefrom also exhibits water repellency permanently.
    Type: Grant
    Filed: December 9, 1991
    Date of Patent: November 23, 1993
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Yuichi Fukui, Tsuruyoshi Matsumoto, Hajime Itoh, Takeo Hamazaki, Itsumi Muraoka
  • Acrylonitrile copolymer, and fiber or core-sheath conjugate fiber prepared therefrom
    Patent number: 5234766
    Abstract: The present invention relates to an acrylonitrile copolymer comprising 70% by weight or more of an acrylonitrile monomer unit and 0.1-30% by weight of a fluoroalkyl methacrylate or fluoroalkyl acrylate monomer unit and having an intrinsic viscosity of 0.8-10, as well as to an acrylonitrile type core-sheath conjugate fiber using the above copolymer as the sheath component. The copolymer according to the present invention has water repellency by itself; accordingly, the above conjugate fiber prepared therefrom also exhibits water repellency permanently.
    Type: Grant
    Filed: December 7, 1992
    Date of Patent: August 10, 1993
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Yuichi Fukui, Tsuruyoshi Matsumoto, Hajime Itoh, Takeo Hamazaki, Itsumi Muraoka