Patents by Inventor Itsumi Muraoka

Itsumi Muraoka 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).

  • Reversibly color-changing shaped material and process for producing the same
    Patent number: 5429871
    Abstract: The present invention relates to a shaped material consisting of a layer having open microvoids (hereinafter referred to as light-scattering layer) and a layer having a hue different from that of the light-scattering layer (hereinafter referred to as color-developing layer), the light-scattering layer constituting at least part of the outer surface of the shaped material and the color-developing layer constituting the rest of the shaped material, which shaped material changes its color reversibly depending upon its moist or dry condition, as well as to a process for producing said shaped material.
    Type: Grant
    Filed: April 21, 1993
    Date of Patent: July 4, 1995
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Yuichi Fukui, Hajime Itoh, Shigeki Hagura, Itsumi Muraoka
  • 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
  • Reversibly color-changing shaped material and process for producing the same
    Patent number: 5252396
    Abstract: The present invention relates to a shaped material consisting of a layer having open microvoids (hereinafter referred to as light-scattering layer) and a layer having a hue different from that of the light-scattering layer (hereinafter referred to as color-developing layer), the light-scattering layer constituting at least part of the outer surface of the shaped material and the color-developing layer constituting the rest of the shaped material, which shaped material changes its color reversibly depending upon its moist or dry condition, as well as to a process for producing said shaped material.
    Type: Grant
    Filed: December 19, 1991
    Date of Patent: October 12, 1993
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Yuichi Fukui, Hajime Itoh, Shigeki Hagura, 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