RFID condition latching
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United States of America Patent
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Oct 13, 2015
Grant Date -
Jun 16, 2011
app pub date -
Nov 30, 2010
filing date -
Nov 30, 2009
priority date (Note) -
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Abstract
A passive radio-frequency identification (RFID) system has an RFID reader that communicates with and provides power to an RFID tag. The RFID tag has an RFID integrated circuit chip that contains a memory device for storing information to be transmitted to the RFID reader, and energy storage device that stores energy for powering the integrated circuit chip. In the event that the RFID tag is activated during periods when the RFID integrated circuit chip is not receiving sufficient energy from the RFID reader, then either an energy storage device is provided to allow the activation event to be recorded at the RFID integrated circuit chip, or a memory device is provided that senses and records the activation event and communicates this activation event once power has been restored.
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