Resources Contact Us Home
Appliance anti-theft and protection circuitry

Image Number 2 for United States Patent #4284983.

New and unique circuitry suitable for being located in electrical appliances, and which protects such appliances from theft and unauthorized movement. More particularly, the invention discloses circuitry for providing an alarm when the appliance is both disconnected and moved. The circuitry monitors both power input and movement of the appliance, and provides a pulsating signal suitable for sounding and audible alarm until the appliance is either reconnected or the alarm interrupted by a key switch. According to one particular embodiment, a mercury interrupter is uniquely arranged to operate as both the motion sensor and the oscillator for providing pulsating power to the audible alarm.

  Recently Added Patents
Buffering stop structure and corresponding packing case
Antibodies to non-functional P2X.sub.7 receptor
Controlling generation of debug exceptions
Method of measuring the flux of a soil gas
Fluid handling structure, a lithographic apparatus and a device manufacturing method
Wound dressing with a discontinuous contact layer surface
Method of applying a spherical correction to map data for rendering direction-of-travel paths on a wireless communications device
  Randomly Featured Patents
Flexible computer initialization
Flexible mast/meter can connector
Cargo carrying vehicle with safety system for shore power connection
Tire changing light
Developing apparatus and image forming apparatus
Convertible garden rake and cultivating tool
Methods and systems for analyzing process equipment processing variations using sensor data
Tungsten-halogen electric lamp with permeable means closing an outer envelope
Image forming device that reduces consumption of toner used for non-printing purpose
Methodology and applications of timing-driven logic resynthesis for VLSI circuits