Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2006-07-11
2006-07-11
Hofsass, Jeffery (Department: 2636)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S010300, C340S010310, C340S010320, C340S010330, C340S010400, C340S572300, C340S870030, C340S870030
Reexamination Certificate
active
07075436
ABSTRACT:
A method, system, and apparatus for interrogating a radio frequency identification (RFID) tag population are described. Tags are interrogated by a reader. The reader and tags engage in communication according to binary traversal algorithms, where single bit data symbols are exchanged between the reader and tags. Furthermore, a reader implicitly controls the operating state of every tag in the tag population by transmitting a single data symbol. Bit patterns may be collected from the tags by the reader, using a variety of interrogation techniques. In a general interrogation, the reader exchanges symbols with the tag population to interrogate the entire tag population. In a specific interrogation, a reader exchanges symbols with the tag population to target a particular tag identification number. Tags may also be placed in a superposition state by the reader, where they respond whenever a received data symbol matches the next bit of their identification number.
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Arneson Michael R
Bandy William R
Powell Kevin J
Shanks Wayne E
Hofsass Jeffery
Pham Lam
Sterne Kessler Goldstein & Fox P.L.L.C.
Symbol Technologies Inc.
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