Patents by Inventor Marvin J. Fisher

Marvin J. Fisher 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).

  • Three-phase A-C speed control for variable torque motor
    Patent number: 4940927
    Abstract: A three-phase A-C speed controller for small integral and fractional horsepower motors includes a phase locked loop comprised principally of a phase comparator and voltage controlled oscillator to generate phase delayed trigger signals for energizing the windings of a three-phase A-C motor. A pair of shift registers are cascaded with a flip-flop to generate the 60.degree. phase delay between phases as is necessary in a three-phase system.
    Type: Grant
    Filed: August 29, 1985
    Date of Patent: July 10, 1990
    Assignee: Century Electric, Inc.
    Inventor: Marvin J. Fisher
  • Starting control circuit for a multispeed A.C. motor
    Patent number: 4453118
    Abstract: This disclosure depicts a starting control circuit for a multispeed alternating current motor having at least two run windings and at least two start windings and a mechanical rotational output.
    Type: Grant
    Filed: November 8, 1982
    Date of Patent: June 5, 1984
    Assignee: Century Electric, Inc.
    Inventors: Graham R. Phillips, Marvin J. Fisher