Patents by Inventor Chung Yeung Chan

Chung Yeung Chan 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).

  • Stepping motor for timepiece
    Patent number: 5124599
    Abstract: A stepping motor for a timepiece has a coil (12), a single magnetic circuit, two stator pole pieces (10a, 10b), and two rotors in the form of axially magnetized permanent-magnet disks (13, 14). The two rotors are coaxial and disposed one on each side of a plane defined by the stator pole pieces defining gaps of different widths (.delta.1, .delta.2) between adjacent facing surfaces of said respective disks and said stator pole pieces.
    Type: Grant
    Filed: March 19, 1991
    Date of Patent: June 23, 1992
    Assignee: Silcon Enterprises Ltd.
    Inventors: Chung Yeung Chan, Chong Sirivai