Patents by Inventor Yoshiharu Ohtuki

Yoshiharu Ohtuki 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).

  • Method of injection molding with air assist for making a handle-shaped molded article
    Patent number: 5308574
    Abstract: A method for producing a handle-shaped molded article (1) having a thick grip portion (2) and at least one thick fitting portion (3) by injection molding using an injection molding apparatus (10) equipped with a mold having a cavity (60), a resin gate (46) provided in a portion (62) where the fitting portion is to be formed and a gas inlet (48) provided in a portion (64) where the grip portion is to be formed. A hollow structure (4) is formed in the grip portion (2) and a solid structure is formed in the fitting portion (3) by injecting a molten resin into the cavity (60) through the resin gate (46), thereby filling molten resin in a fitting portion-forming cavity zone formed of that portion (62) of the mold where the resin gate is provided and the fitting portion is to be formed and further filling molten resin in part of the rest of the cavity.
    Type: Grant
    Filed: May 1, 1992
    Date of Patent: May 3, 1994
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Kunio Yamazaki, Akimasa Kaneishi, Yoshiharu Ohtuki, Akinori Toyota