The present invention discloses a data tag device (100) which initially operates in an active mode where the tag occasionally transmits an unsolicited beacon (412). While operating, an expiration event occurs (512, 514) which causes the tag to disable a battery (110), preventing subsequent operation...http://www.google.es/patents/US7928846?utm_source=gb-gplus-sharePatente US7928846 - Method and apparatus for disabling active mode operation of a data tag device
Method and apparatus for disabling active mode operation of a data tag device
