Patents by Inventor Mitsuhiro Tsukada

Mitsuhiro Tsukada 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).

  • Metal mold for injection molding tubular or columnar products and molded product obtained by using same
    Patent number: 4973242
    Abstract: A metal mold for injection molding tubular or columnar products is provided in which those portions of matching surfaces of the metal mold members close to end portions of an annular or cylindrical cavity are provided with grooves extending continuously or intermittently so as to surround the cavity's end portions.
    Type: Grant
    Filed: April 5, 1989
    Date of Patent: November 27, 1990
    Assignee: Polyplastics Co., Ltd.
    Inventor: Mitsuhiro Tsukada