Patent ID: 6842121

Claim:
A method of signaling when an object is about to be unloaded from a vehicle at a destination different from the object's intended destination, comprising the steps of: storing data representing the object's intended destination in a memory device within an RFID transceiver tag; mounting the tag on the object; transporting the object in a vehicle to a first destination; mounting an RFID interrogator transceiver adjacent an unloading aperture of the vehicle; transmitting an RF interrogation signal from the interrogator transceiver so as to prompt the tag to respond by transmitting an RF signal containing its intended destination if said object is unloaded from the vehicle through said aperture; the interrogator receiving the response RF signal from the tag; and the interrogator comparing whether the intended destination contained in the response RF signal received from the tag is the same as the first destination and, if not, the interrogator signaling that the object should not be delivered to the first destination.