Patents by Inventor Terunobu Koike

Terunobu Koike 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).

  • Method of improving residual stress in circumferential weld zone
    Patent number: 4772336
    Abstract: A method for improving residual stress in a circumferential weld zone of a piping and the like which includes preventing deformation of the weld zone, and causing a local expansion or contraction of a portion of the piping axially spaced from the weld zone thereby effecting a plastic working so as to increase or decrease the diameter of piping. The method can effectively be applied to apparatus and pipe system which are used in a corrosive environment and under action of a static or dynamic outer load.
    Type: Grant
    Filed: February 17, 1987
    Date of Patent: September 20, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Kunio Enomoto, Tasuku Shimizu, Shinji Sakata, Terunobu Koike, Nobuo Shimizu, Tsukasa Ikegami