Patents by Inventor James D. Keith

James D. Keith 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).

  • Motor acceleration and starting torque control
    Patent number: 4162437
    Abstract: A three phase motor acceleration control fires SCR's to supply successively longer current pulses to the motor. The SCR's are controlled by comparing a chopped reference ramp and individual trigger ramps.
    Type: Grant
    Filed: August 27, 1976
    Date of Patent: July 24, 1979
    Assignee: Incom International
    Inventors: James D. Keith, Bruce E. Gray