Patents by Inventor Nobuaki Yakoh

Nobuaki Yakoh 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 detecting flaws in thick wall steel pipe with ultrasonic angle beam technique
    Patent number: 4679437
    Abstract: A method of reliably detecting flaws in a thick wall steel pipe with an ultrasonic beam in which flaws of the internal surface of the pipe are detected using a shear wave mode. The transmitting probe is disposed slantingly relative to both the longitudinal and transverse directions of the pipe so that the shear wave emitted therefrom is incident onto the pipe at a refraction angle of 35 to 70 degrees, whereby the beam inside the walls of the pipe is made to impinge on surface flaws of the inner surface of the pipe at an angle in the same range.
    Type: Grant
    Filed: October 4, 1985
    Date of Patent: July 14, 1987
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Mitsuhiro Koike, Nobuaki Yakoh