Patents by Inventor David Francis Ellison

David Francis Ellison 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).

  • Fault interrupter using microcontroller for fault sensing and automatic self-testing
    Patent number: 6807035
    Abstract: A fault interrupter having a microcontroller is provided to detect actual faults. The fault interrupter initiates a periodic self-test and provides external notification to the user upon successful or unsuccessful completion of the test. The fault interrupter generates the test signal at a selected time to substantially coincide with the zero-crossing of the AC power source. A manual test can also be performed using a manual test switch provided as a direct input to the microcontroller.
    Type: Grant
    Filed: November 28, 2000
    Date of Patent: October 19, 2004
    Assignee: Hubbell Incorporated
    Inventors: John Richard Baldwin, Thomas James Batko, David Francis Ellison, Thomas Michael McDonald