Portable security system using communicating cards

Details Portable security system using communicating cards Portable security system using communicating cards

1993-07-23

1995-03-07

Coles, Sr., Edward L.

Communications: electrical

Condition responsive indicating system

Specific condition

340571, 340539, 340573, 340568, G08B 1314

Patent

active

053962184

ABSTRACT:
A portable security system is based on maintaining wireless communication between two or more plastic cards within a defined range. In the simplest form, a first card intermittently transmits an identification code to a second card. The second card compares that code with a code in an internal register, and on matching those codes, transmits a return code to the first card. The first card compares the return code with a code in an internal register, and on matching those codes, resets a timer. If the timer is not reset during a defined number of transmissions by the first card, an alarm circuit is activated. One card is attached to a valuable object such as a wallet on the person, and the other card is placed elsewhere on the person; theft of the object from the person results in activation of the alarm circuit. In an advanced form, a master card communicates with a series of slave cards; each of the slave cards is attached to a different valuable object on the person.

REFERENCES:
patent: 4593273 (1986-06-01), Narcisse
patent: 4804943 (1989-02-01), Soleimani
patent: 4837568 (1989-06-01), Snaper
patent: 4937581 (1990-06-01), Baldwin et al.
patent: 5028918 (1991-07-01), Giles et al.
patent: 5245317 (1993-09-01), Chidley et al.

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