Patent ID: 7492256

Claim:
An apparatus for detecting whether a device has been tilted beyond a predefined threshold, said apparatus comprising: a casing for temporarily enclosing a radio frequency identification (RFID) tag, said RFID tag being unable to receive an RFID interrogation signal when said RFID tag is enclosed in said casing; said apparatus detecting an amount of tilt of said device; and in response to said amount of tilt exceeding said predefined threshold, said RFID tag being exposed to RFID interrogation signal and said RFID tag receiving said RFID interrogation signal when said RFID tag is exposed; and said RFID tag transmitting a reply RFID signal in response to a receipt by said RFID tag of said RFID interrogation signal, said RFID tag transmitting said reply RFID signal only when said RFID tag is exposed, said RFID reply signal indicating that said device has been tilted beyond said predefined threshold.