US Patent:
20020097152, Jul 25, 2002
Inventors:
Frank Mengrone - Staten Island NY, US
Deborah Mengrone - Staten Island NY, US
International Classification:
G08B013/14
US Classification:
340/571000, 340/426000, 340/573100, 340/539000
Abstract:
A theft detection device, for warning a property owner that a item of property such as an automobile, a child, or a personal item has been brought beyond a predetermined acceptable distance, comprising a plurality of transmitters and a receiver. Each transmitter continuously transmits a unique signal. The receiver monitors the signals from the transmitters, and determines when the signal strength therefrom drops below a predetermined threshold level or is missing altogether. When the property is moved from the owner beyond an acceptable distance, the signal strength will drop below the threshold level and will not be detected, indicating an alert condition. Once an alert condition is established by the receiver, a beeping unit is activated to provide an audible warning to the owner that the property has been stolen, so that the authorities can be immediately notified.