Tag interrogation with observable response signal

Details Tag interrogation with observable response signal Tag interrogation with observable response signal

2006-09-19

2006-09-19

Nguyen, Hung (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S572300, C340S572400, C340S571000, C340S573100, C340S539100, C340S539130, C340S870030

Reexamination Certificate

active

07109865

ABSTRACT:
An identification tag identifies a unique item from among a plurality of items with a similar appearance. Tagged items are searched by scanning the items with an interrogation signal. The tag emits an observable signal to indicate when it receives an identification that matches the identification contained in the tag. When the reader's interrogation is not present, the tag either sleeps at a very low power level or is passively unpowered.

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Want et al. “The Active Badge Location System”, ACM Transactions on Information Systems, vol. 10, No. 1, Jan. 1992, pp. 91-102.

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