Patents by Inventor Shirou Katsumata

Shirou Katsumata 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).

  • Split dies for casting small segments of tire mold
    Patent number: 5163501
    Abstract: Split dies include an upper die and a lower die for casting small segments constituting tread pattern forming portions of a tire mold. The lower mold includes a telescopic die having an upper surface forming a die bottom wall having a configuration corresponding to the tread pattern forming portions of the small segments. The lower mold further includes a main die having a cavity for receiving the telescopic die and having side walls surrounding the cavity to form die inner walls whose configuration corresponds to side walls of the small segments.
    Type: Grant
    Filed: September 18, 1991
    Date of Patent: November 17, 1992
    Assignee: Bridgestone Corporation
    Inventors: Hideaki Tanaka, Kazuhiko Ota, Shirou Katsumata, Sachiko Kamata