Patents by Inventor Clarence H. Fisher

Clarence H. 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).

  • Electrical motor monitoring system for a domestic appliance
    Patent number: 5200684
    Abstract: A drive system for an automatic washer or dryer having a rotatable drum about a horizontal axis. An induction motor drives the drum and is connected to and disconnected from a source of alternating voltage by a microprocessor to control the speed of the motor. The microprocessor senses the zero crossing of the alternating voltage and the zero crossing of alternating current flowing in the motor to determine the time to connect the motor to the alternating voltage. The microprocessor analyzes successive readings of the motor's back emf to detect undesirable load distributions and effect redistribution.
    Type: Grant
    Filed: May 28, 1991
    Date of Patent: April 6, 1993
    Assignee: Whirlpool Corporation
    Inventor: Clarence H. Fisher
  • Electrical motor monitoring system for a domestic appliance
    Patent number: 5075613
    Abstract: A drive system for an automatic washer or dryer having a rotatable drum about a horizontal axis. An induction motor drives the drum and is connected to and disconnected from a source of alternating voltage by a microprocessor to control the speed of the motor. The microprocessor senses the zero crossing of the alternating voltage and the zero crossing of alternating current flowing in the motor to determine the time to connect the motor to the alternating voltage. The microprocessor analyzes successive readings of the motor's back emf to detect undesirable load distributions and effect redistribution.
    Type: Grant
    Filed: March 30, 1990
    Date of Patent: December 24, 1991
    Assignee: Whirlpool Corporation
    Inventor: Clarence H. Fisher