Patents by Inventor Gary N. Larkin

Gary N. Larkin 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).

  • Monitoring of alarm system wiring
    Patent number: 7372369
    Abstract: A supervisory method and apparatus provide for detection of “partial fault” conditions such as a relatively high series impedance in the wiring, or a relatively low parallel impedance across the wiring. A non-linear element, such as a semiconductor diode, can be used as an end of line element. The element functions as a current controlled dynamic impedance such that currents through the element can be used to detect low parallel leakage currents. Higher currents through the element can be used to detect partial open circuits.
    Type: Grant
    Filed: October 28, 2005
    Date of Patent: May 13, 2008
    Assignee: Honeywell International, Inc.
    Inventor: Gary N. Larkin