Patents by Inventor Yuzo Yokota

Yuzo Yokota 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 bit
    Patent number: 4687388
    Abstract: A drill bit is provided with a pair of cutting edges which are positioned so that a narrow slot is formed therebetween in an area including the rotational axis of the drill bit and so that the lines joining the rotational axis of the drill bit and the innermost points of the respective cutting edges are at an angle not larger than about 160.degree. with each other as viewed in the axial direction of the drill bit.
    Type: Grant
    Filed: May 22, 1986
    Date of Patent: August 18, 1987
    Assignee: Toshiba Tungaloy Co., Ltd.
    Inventors: Yuzo Yokota, Atsushi Endo