Patents by Inventor Tatuo Ishikawa

Tatuo Ishikawa 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 for the determination of strength of join between ceramic and non-ceramic
    Patent number: 5101663
    Abstract: The strength of a join between a ceramic and an associated non-ceramic is determined using an ultrasonic microscope. A converging ultrasonic beam is radiated against a point on a surface of the ceramic, said point being a predetermined distance away from the join between the ceramic and the associated non-ceramic. Data on the intensities of interference waves at respective predetermined variations of the relative distance between a probe of the ultrasonic microscope and the ceramic are collected. The residual stress at the point is calculated on the basis of the cycle of echo intensities of the interference waves for the respective predetermined variations of the relative distance. The strength of the join is then determined on the basis the residual stress.
    Type: Grant
    Filed: July 26, 1991
    Date of Patent: April 7, 1992
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Toshio Narita, Isao Ishikawa, Tatuo Ishikawa