Patents by Inventor Seiki Ra

Seiki Ra 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).

  • Displaced position detecting device
    Patent number: 4238844
    Abstract: A device which detects a displaced position by generating an ultrasonic signal in a magnetostrictive wire and measuring the propagation time of the signal generated. The device includes an exciting means to generate an ultrasonic signal in a magnetostrictive wire, first and second receiving means to receive the ultrasonic signal generated in the magnetostrictive wire by the exciting means, a means for changing the distance between the exciting means and each of the first and second receiving means in accordance with a mechanical displacement, and a circuit means for producing a signal representative to the time periods required for the generated ultrasonic signal to reach the first and second receiving means.
    Type: Grant
    Filed: February 23, 1979
    Date of Patent: December 9, 1980
    Assignee: Yokogawa Electric Works, Ltd.
    Inventors: Toshitsugu Ueda, Seiki Ra, Masanori Noguchi