Patents by Inventor Allan D. Crapo

Allan D. Crapo 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).

  • Disc drive spindle motor with log cogging torque
    Patent number: 4847712
    Abstract: A spindle motor is adapted to support a hub with one or more discs thereon. The motor comprises a stator with nine windings of equal cross-section and a rotor with eight equally spaced poles radially oriented with respect to the stator. The rotor windings are connected to define first, second and third phases.
    Type: Grant
    Filed: May 4, 1987
    Date of Patent: July 11, 1989
    Assignee: Seagate Technology, Inc.
    Inventor: Allan D. Crapo