Radio frequency identification device

Communications: electrical – Selective – Interrogation response

Reexamination Certificate

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Details

C340S010300, C340S572100

Reexamination Certificate

active

07005965

ABSTRACT:
The present invention provides a radio frequency identification (RFID) device including a detector and several identification tags. The detector transmits time slot cycle signals, and each of the cycle signals is divided into several slots. The identification tags receive the time slot cycle signal, and each of the tags respectively contains a random generator to generate a random number. Individual identification tag responds to the detector in an assigned time slot corresponding to a random number generated by the random generator in each single time slot cycle.

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patent: 5365551 (1994-11-01), Snodgrass et al.
patent: 5539394 (1996-07-01), Cato et al.
patent: 5686902 (1997-11-01), Reis et al.
patent: 5883582 (1999-03-01), Bowers et al.
patent: 5929779 (1999-07-01), MacLellan et al.
patent: 6641036 (2003-11-01), Kalinowski
patent: 6661336 (2003-12-01), Atkins et al.
patent: WO 01/01326 (2001-01-01), None

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