Patents by Inventor Katsuji Yokoyama

Katsuji Yokoyama 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).

  • Optical read-out audio check disc with semitransparent defects or with single recorded tone
    Patent number: 5258974
    Abstract: A check disc on which a single frequency signal is recorded on a check point next to an information signal of each track number and simulated defects such that the reproduction signal obtained by reproducing the disc becomes a defect signal in the case where defects occur on the disc are provided on the check point.
    Type: Grant
    Filed: May 23, 1990
    Date of Patent: November 2, 1993
    Assignee: Sony Corporation
    Inventors: Noriyuki Ishimura, Katsuji Yokoyama
  • Medical tube fastener
    Patent number: D318123
    Type: Grant
    Filed: January 9, 1989
    Date of Patent: July 9, 1991
    Assignee: Terumo Kabushiki Kaisha
    Inventors: Katsuji Yokoyama, Osamu Yokono