Patent ID: 6601764
Filing Date: 2003-08-05
Classification: G06Q

Abstract:
An inventory management method comprising the steps of:(a) obtaining identification information and location information for an electronic shelf label (ESL); (b) sending a first message to the ESL to activate a first radio frequency identification (RFID) label on a first item associated with the ESL using an RFID label interrogator associated with the ESL; (c) obtaining first RFID label information from the first RFID label by the ESL; (d) storing the first RFID label information in a record; (e) sending a second message to the ESL to activate a second RFID label on a second item associated with the ESL using the RFID label interrogator; (f) obtaining second RFID label information from the second RFID label by the ESL; (g) comparing the first and second RFID label information; (h) removing the first RFID label information from the record if the second RFID label information does not contain the first RFID label information; and (i) adding third RFID label information representing a difference between the first and second RFID label information to the record.