Patents by Inventor Takeshi Hirayoshi

Takeshi Hirayoshi 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).

  • Drill screw
    Patent number: 4753562
    Abstract: A drill screw is provided having a head, a male thread section and a drilling section. The screw includes a web on top of the drilling section, and the web has an elongated recess in its central portion. The recess splits the web into chisel edges each rising toward the respective ridges.
    Type: Grant
    Filed: December 30, 1985
    Date of Patent: June 28, 1988
    Assignee: Kobe Fastener Limited
    Inventor: Takeshi Hirayoshi