15 Hind John R Mathewson James M Peters Marcia L 2002 Identification and tracking of persons using RFID-tagged items USA 11/2002 US2002165758 RFID http://v3.espacenet.com/origdoc?DB=EPODOC&IDX=US2002165758&F=0&RPN=US7076441&DOC=dcb65d04ab6920de9b5611c9924bf2c269