Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-08-31
1997-04-29
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
3408253, 34082554, 342 44, G08B 1314
Patent
active
056253419
ABSTRACT:
A multi-bit electronic article surveillance marker includes an antenna circuit and is powered by an interrogation field generated by EAS detection equipment and received by the marker's antenna circuit. The marker generates a multi-bit signal by selectively disturbing the interrogation field. The disturbances may be created by selectively short circuiting the marker's antenna circuit. All of the marker circuitry, including a coil that is part of the antenna circuit, may be provided as circuit elements formed on a semiconductor integrated circuit substrate.
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Ferguson David B.
Frederick Richard
Giles Olin S.
Patterson Hubert A.
Hofsass Jeffery
Lee Benjamin C.
Sensormatic Electronics Corporation
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