Patents by Inventor Yuzo Ishizuka

Yuzo Ishizuka 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).

  • Waterproof nut
    Patent number: 4887950
    Abstract: A waterproof nut which may be used, for example, inside a water storage tank, is constituted by a metallic nut body having the outer periphery coated with a synthetic resin layer which also covers both the front and rear surfaces of the nut body. The resin layer which covers the rear surface of the nut body includes a cap-shaped portion for accommodating the free end of a bolt which is screwed into the nut body in such a manner that the free end projects from the rear surface of the nut body, whereby water is prevented from entering the nut body.
    Type: Grant
    Filed: April 29, 1988
    Date of Patent: December 19, 1989
    Assignee: Bridgestone Corporation
    Inventors: Kiyoshi Sakayori, Shinichi Iwasaki, Yozo Ishida, Toshikazu Shinogaya, Yuzo Ishizuka
  • Method of manufacturing waterproof nuts
    Patent number: 4788022
    Abstract: A waterproof nut which may be used, for example, inside a water storage tank, is constituted by a metallic nut body having the outer periphery coated with a synthetic resin layer which also covers both the front and rear surfaces of the nut body. The resin layer which covers the rear surface of the nut body includes a cap-shaped portion for accommodating the free end of a bolt which is screwed into the nut body in such a manner that the free end projects from the rear surface of the nut body, whereby water is prevented from entering the nut body.
    Type: Grant
    Filed: September 3, 1987
    Date of Patent: November 29, 1988
    Assignee: Bridgestone Corp.
    Inventors: Kiyoshi Sakayori, Shinichi Iwasaki, Yozo Ishida, Toshikazu Shinogaya, Yuzo Ishizuka