Patents by Inventor Tatsuji Yokoyama

Tatsuji 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).

  • Bicycle with electric motor
    Patent number: 5375676
    Abstract: Art electrically assisted bicycle wherein electric assist is provided is proportion to the manual force for pedalling the bicycle. The device includes an arrangement for maintaining the speed of the electric motor at the same speed as the bicycle even when no force is applied to the pedal even though the bicycle is in motion so as to reduce the time delay and power losses when power assist is required.
    Type: Grant
    Filed: March 5, 1993
    Date of Patent: December 27, 1994
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Nozomu Takata, Tatsuji Yokoyama