Patents Assigned to Lazzara Electronics, Inc.
  • Capacitance change article removal alarm
    Patent number: 5159316
    Abstract: An object to be protected is placed on a compressible pad having upper and lower conductive plates, separated by a compressible dielectric. A sensing device is connected to the upper and lower plates to sense a first capacitance when the upper plate is compressed by presence of the object, and a change in capacitance when the object is removed so as to permit the dielectric layer to expand and change the capacitance. There is a time delay circuitry and other circuitry to alleviate the possibility of false alarms.
    Type: Grant
    Filed: August 3, 1990
    Date of Patent: October 27, 1992
    Assignee: Lazzara Electronics, Inc.
    Inventor: Sal Lazzara