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US 7,605,700 B2Granted
RFID tag data retention verification and refresh
AssigneeSymbol Technologies, Inc.
InventorsRandall Allen Drago, Ming-Hao Sun, Chun-Huei Bair, Kevin J. Powell, Omid Roshan-Afshar, Theodore Hockey, Jonathan Pfeifer
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Abstract
Methods, systems, and apparatuses for monitoring and refreshing data stored in radio frequency identification (RFID) tags are described. A voltage margin for data stored in memory of a tag is checked. If the voltage margin has decreased to an undesirable level, the data stored in the tag is refreshed.
Claims7
A method for retention of data stored in a non-volatile memory of a radio frequency identification (RFID) tag, comprising:
- receiving at the tag a command to verify data retention;
- determining whether a desired voltage margin is present in a memory location of the non-volatile memory of the tag;
- and
- refreshing the data stored in the non-volatile memory if it is determined that the desired voltage margin is not present, wherein the command is transmitted by a reader according to an EPC Gen 2 communications protocol, wherein the command is a CUSTOM command, wherein said receiving comprises receiving at the tag the CUSTOM command.
1 more element
Dependencies are inferred from the claim text.