Patents by Inventor Itsuo Hamada

Itsuo Hamada 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).

  • Reexpandable shrunken foam bodies of styrene-acrylonitrile type resin, method for manufacture thereof, and method for filling therewith
    Patent number: 4772636
    Abstract: Improved reexpandable shrunken foam bodies of styrene-acrylonitrile type resin possessing an ability to reexpand to the original volume of the highly foamed state when left standing at room temperature under atmospheric pressure and a method for the manufacture of such reexpandable shrunken foam bodies.The aforementioned shrunken foam bodies are obtained by causing a styrene-acrylonitrile type resin to contain a prescribed large amount of a specific foaming agent exhibiting a slow gas permeation speed to the base resin and possessing the boiling point exceeding a fixed lower limit, heating the resin with steam thereby setting it to foam highly, and releasing the foamed resin into the atmosphere to be cooled and shrunk therein.The aforementioned shrunken foam bodies are convenient for the purpose of transportation and storage. They are useful as fillers intended to absorb shocks and insulate heat.
    Type: Grant
    Filed: December 4, 1987
    Date of Patent: September 20, 1988
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Norihiko Sakata, Itsuo Hamada
  • Rigid thermoplastic resin foam and process for preparation thereof
    Patent number: 4585605
    Abstract: The foam of the present invention, which has a multi-cellular structure including many wrinkles having one end in the boundary portion where at least three cells are adjacent to one another and extending toward the central portion of the cell wall, is a rigid thermoplastic resin foam having an ultra-low density, a high sound-insulating property, a high heat-insulating property and a high flexibility, and it is suitable for adaption for building construction. The process of the present invention is to provide the aforesaid foam of the present invention by subjecting the foam of a rigid thermoplastic resin to expansion, contraction and aging.
    Type: Grant
    Filed: September 25, 1985
    Date of Patent: April 29, 1986
    Assignee: Dow Chemical Company
    Inventors: Takao Kadota, Masayuki Hashimoto, Itsuo Hamada
  • Rigid thermoplastic resin foam and process for preparation thereof
    Patent number: 4552904
    Abstract: The foam of the present invention, which has a multi-cellular structure including many wrinkles having one end in the boundary portion where at least three cells are adjacent to one another and extending toward the central portion of the cell wall, is a rigid thermoplastic resin foam having an ultra-low density, a high sound-insulating property, a high heat-insulating property and a high flexibility, and it is suitable for adaption for building construction. The process of the present invention is to provide the aforesaid foam of the present invention by subjecting the foam of a rigid thermoplastic resin to expansion, contraction and aging.
    Type: Grant
    Filed: March 19, 1985
    Date of Patent: November 12, 1985
    Assignee: The Dow Chemical Company
    Inventors: Takao Kadota, Masayuki Hashimoto, Itsuo Hamada
  • Cushioning material for packaging
    Patent number: D461714
    Type: Grant
    Filed: October 15, 2001
    Date of Patent: August 20, 2002
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Itsuo Hamada, Yasushi Ueda
  • Cushioning material for packaging
    Patent number: D461715
    Type: Grant
    Filed: October 15, 2001
    Date of Patent: August 20, 2002
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Itsuo Hamada, Toshio Yamasaki