Patents by Inventor Yusuru Takazawa

Yusuru Takazawa 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).

  • Driving device for an electric timepiece
    Patent number: 4167848
    Abstract: A driving device including a magnetized driving rotor mounted for rotation within a magnetic field produced in a coreless coil, and, in order to make the magnetic pole of said driving rotor deviate by a definite angle relative to the magnet field direction of said coil, a supplementary magnetized rotor mounted for rotation outside of the coil and magnetically coupled with the driving rotor. And the supplementary rotor is provided with magnetic poles, the number thereof being greater than the number of poles of said driving rotor. The driving rotor has an odd number of pole pairs.
    Type: Grant
    Filed: July 25, 1978
    Date of Patent: September 18, 1979
    Assignee: Seiko Koki Kabushiki Kaisha
    Inventors: Kiyoshi Kitai, Masuo Ogihara, Kozo Sato, Nobuo Shinozaki, Yoichi Seki, Yusuru Takazawa