Antitheft system for sales areas
OwnerFriedrich Karl Johnsseninventor
Life of this patent
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Abstract
An antishoplifting system for premises in which goods are sold and in which signal transmitters are affixed to the articles of goods. Each of the transmitters has a continuously effective first signal emitter which cooperates with a detector at the entrance or exit of the premises to signal removal of an article with the transmitter thereon. In addition, each transmitter comprises a self-contained second signal emitter, which requires no external energy source and is activatable upon removal of the transmitter from the goods to emit a signal. Receivers on the premises detect this signal and produce an output indicating the location of the source thereof.
Claims9
An antishoplifting system for protecting a premises against theft of goods therefrom, comprising:
- a plurality of signal transmitters affixed to respective articles of said goods, each of said transmitters comprising:
- a housing,
- a first, continuously effective, signal emitter in said housing,
- a second, stored-energy, triggerable signal emitter in said housing, and
- means on said housing for triggering said second emitter upon the removal of the transmitter from the respective article;
- means responsive to said first signal emitter for signaling the removal of an article carrying the transmitter thereof from the premises;
- and
- means responsive to a signal from said second emitter upon the triggering thereof for localizing the source of said signal on said premises.
Dependencies are inferred from the claim text.