Patents by Inventor Kazuhiko Tsukaguchi

Kazuhiko Tsukaguchi 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 measuring stress
    Patent number: 5289387
    Abstract: Stress in a substance is measured by utilizing the transfer characteristics of elastic waves, such that elastic waves input to a substance are displaced by the stress load within the substance. Waves input to the substance and output therefrom by transmission or reflection are compared by fast fourier transform analysis, obtaining a wave attenuation factor quantifying the magnitude of stress in the substance.
    Type: Grant
    Filed: July 20, 1990
    Date of Patent: February 22, 1994
    Assignees: Nissan Motor Company, Limited, Yakichi Higo
    Inventors: Yakichi Higo, Junichiro Matsuoka, Jun Kiyoshige, Kazuhiko Tsukaguchi, Shigenori Kazama