Resonant tag and deactivator for use in an electronic security s

Details Resonant tag and deactivator for use in an electronic security s Resonant tag and deactivator for use in an electronic security s

1982-05-10

1985-02-05

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

343 68R, G08B 1324

Patent

active

044980760

ABSTRACT:
A resonant tag circuit having at least one resonant frequency is operative in an electronic security system in which the tag circuit is sensed and electronically deactivated to destroy the resonant characteristics of the tag circuit at the detection frequency. The tag circuit is electronically deactivated by a breakdown mechanism operative within the resonant structure of the tag to cause vaporization of a conductive area or short-circuiting of capacitor plates to destroy the resonant properties of the circuit. A deactivator provides electromagnetic energy at a resonant frequency of the tag circuit of sufficient energy to cause electrical breakdown and deactivation of the tag circuit.

REFERENCES:
patent: 3624631 (1971-11-01), Chomet et al.
patent: 3810147 (1974-05-01), Lichtblau
patent: 3913219 (1975-10-01), Lichtblau
patent: 3938044 (1976-02-01), Lichtblau
patent: 3967161 (1976-06-01), Lichtblau

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