Patents by Inventor Keiji Nishiura

Keiji Nishiura 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).

  • Injection-molded hollow article, hollow injection molding method and metal mold therefor
    Patent number: 5849377
    Abstract: Disclosed is an injection-molded hollow article having large hollow portions 1 which securely provide the strength required by the injection-molded hollow article without depending upon ribs as more solid remaining portions being unstable in position and size.A melted resin and pressurized fluid are injected under pressure into a metal mold cavity 4, a movable core 5 projected into the metal mold cavity 4 is moved and then a support portion 2 is formed at the position from which the movable core 5 is moved.The position and size of the support portion 2 can be determined by selecting the position and size of the movable core 5.
    Type: Grant
    Filed: September 24, 1992
    Date of Patent: December 15, 1998
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Maki Horikoshi, Yuji Tanaka, Keiji Nishiura