RFID label time synchronization

Details RFID label time synchronization RFID label time synchronization

2007-10-26

2011-10-04

Swarthout, Brent (Department: 2612)

Communications: electrical

Selective

Interrogation response

C340S870010, C340S870170

Reexamination Certificate

active

08031053

ABSTRACT:
Methods and apparatus, including computer program products, for radio frequency identification (RFID) label time synchronization. A method includes, in a radio frequency identification (RFID) interrogator having an antenna, transceiver, a clock, a memory and a central processing unit (CPU), initializing a RFID tag with a label start time and a time to record data, the label start time representing an actual start time indicated by the clock, receiving a label stop time, a label time and logged data from an interrogation of the RFID tag, and compensating the label time for a drift between the label stop time and an actual stop time.

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USPTO Transaction History of related U.S. Appl. No. 11/942,353, filed Nov. 19, 2007, entitled “RFID Device Time Synchronization From a Public Source.”
USPTO Transaction History of U.S. Appl. No. 11/942,353, filed Nov. 19, 2007, entitled “RFID Device Time Synchronization From a Public Source.”
Greeff, Roy, U.S. Appl. No. 11/942,353; “RFID Label Time Synchronization”, filed Nov. 19, 2007.

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