Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1989-01-31
1990-04-24
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
G08B 1324
Patent
active
049203355
ABSTRACT:
An improved electronic article surveillance device of the type utilized a parallel resonant circuit and primarily intended for use in tagging retail items for the purpose of preventing unauthorized removal of theft of such items includes, within the parallel resonant circuit, at least one transmission line resonator whereby the device may be easily and efficiently deactivated. The length of the transmission line resonator is one-quarter wave length of the deactivation frequency, and deactivation frequency is preferably selected from readily available electromagnetic radiation such as, for example, microwave energy or police radar energy.
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patent: 3500373 (1970-03-01), Minasy
patent: 3624631 (1971-11-01), Chomet et al.
patent: 3810147 (1974-05-01), Lichtblau
patent: 3938044 (1976-02-01), Lichtblau
patent: 4745401 (1988-05-01), Montean
patent: 4778552 (1988-10-01), Benge et al.
patent: 4835524 (1989-05-01), Lamond et al.
Interamerican Industrial Company
Swann III Glen R.
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