Patent ID: 8269609

Claim:
A portable device tracking system comprising: a server in communication with a plurality of RFID readers distributed about an area, the plurality of RFID readers configured to detect an RFID transmitter coupled to a portable device, the portable device including a battery, two exposed device electrical contacts for connecting the RFID transmitter with the battery of the portable device, and a removable active RFID transmitter having two exposed transmitter electrical contacts coupled with the portable electronic device, the RFID transmitter oriented such that the device electrical contacts touch the transmitter electrical contacts allowing the battery to power the removable active RFID transmitter; wherein the server calculates a location of the portable device based on a plurality of readings from the plurality of RFID readers, each RFID reader producing a broadcast alone and waiting for a response from the RFID transmitter before another one of the plurality of RFID readers produces a broadcast, and transmits the location securely to a user through a secure receiver in communication with the server.