Patent ID: 7924161

Claim:
A method for determining when a set of RFID tags on a set of objects belongs to a same defined subset of objects, comprising: detecting the set of RFID tags on the set of objects, said RFID tags comprising integrated devices capable of sending signals that can be received by a receptor device and interpreted to determine a motion state of each RFID tag and object; receiving said signals from the set of RFID tags; interpreting said signals to determine the motion state of each RFID tag and object within the set, wherein said signals indicate whether the motion state of each RFID tag and object is in a state of stationary, starting in motion, stopping in motion, or continuing in motion; determining which RFID tags and objects are in a same motion state within a predetermined time of each other; identifying the RFID tags that are in the same motion state, within the predetermined time, as belonging to the same defined subset of objects; and determining a location of all the objects in the defined subset of objects by determining a location of as few as one RFID tag in the defined subset of objects.