System and transmitter
First Claim
1. A system for anti-theft transponders, characterized by an autonomous low power transmitter device capable of transmitting a specified command for accessing at least one anti-theft transponder, the anti-theft transponder comprising one receiver module operating on a designated frequency used by a general coverage paging system, the transponder further comprising at least one transmitting means and control circuitry, and that the anti-theft transponders are provided with a first individual access identity code for authorization of an activation by means of a paging system and at least a second general access identity code for a direct control by the autonomous low power transmitter within its limited coverage.
1 Assignment
0 Petitions
Accused Products
Abstract
An improved system for an anti-theft transponder includes, besides a general paged transponder an autonomous low power transmitter device capable of transmitting a specified address code for accessing at least one anti-theft transponder which includes one receiver module operating on a designated frequency used by a general coverage paging system. The transponder of the system additionally includes several modules for the tracking of the device when activated. The anti-theft transponder of the improved system is provided with a first individual access identity intended for authorization of activation by the paging system and at least a second general access identity code used for control of a direct activation within a limited coverage of the low power transmitter. A low power transmitter can also be regularly transmitting a general access identity code for a control that the item under surveillance does not illegally leave a site where it is kept.
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Citations
9 Claims
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1. A system for anti-theft transponders, characterized by
an autonomous low power transmitter device capable of transmitting a specified command for accessing at least one anti-theft transponder, the anti-theft transponder comprising one receiver module operating on a designated frequency used by a general coverage paging system, the transponder further comprising at least one transmitting means and control circuitry, and that the anti-theft transponders are provided with a first individual access identity code for authorization of an activation by means of a paging system and at least a second general access identity code for a direct control by the autonomous low power transmitter within its limited coverage.
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4. A transmitter for anti-theft transponders for locally controlling the anti-transponders for a change into an active mode, characterized in
an autonomous low power transmitter device is formed capable of generating a specified command for accessing at least one anti-theft of the transponders, the anti-theft transponders comprising a receiver module operating on a designated frequency used by a general coverage paging system, and the anti-theft transponders are provided with a first individual access identity code for authorization of an activation by means of a paging system and at least a second general access identity code for a direct control by the autonomous low power transmitter within its limited coverage area, and that the autonomous low power transmitter is provided with a control switch (S2) for activating a broadcast of a defined series of transmissions with an authorization code for anti-theft transponders in a transponder system to thereby locally control each transponder receiving the transmissions of the autonomous low power transmitter.
Specification