Patents by Inventor Thomas W. Porter

Thomas W. Porter 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).

  • Patent number: 5170360
    Abstract: A circuit breaker system uses a microprocessor for calculating at least one function of a measured current flow.
    Type: Grant
    Filed: December 7, 1990
    Date of Patent: December 8, 1992
    Assignee: Square D Company
    Inventors: Thomas W. Porter, Craig G. Ross, Jr.
  • Patent number: 5166887
    Abstract: A circuit breaker system employs a sensor circuit to measure the current flow in a conductor. A microcomputer monitors the current flow and trips a circuit breaker if the measured current flow exhibits certain predetermined characteristics. A power supply circuit generates a regulated output voltage proportional to the measured current flow to supply power to a portion of the circuit breaker system electronics. To protect the portion of the electronics powered by the power supply circuit, the output from the power supply is shorted through a resistance circuit for a predetermined period of time if the magnitude of the measured current flow induces an output voltage in excess of a predetermined level.
    Type: Grant
    Filed: January 28, 1991
    Date of Patent: November 24, 1992
    Assignee: Square D Company
    Inventors: Ronald L. Farrington, Thomas W. Porter