The invention disclosed provides a method, system, and tag for detection and tracking of objects. The method includes the steps of: a) attaching to each of the objects a low radio frequency detection tag having an antenna, a transceiver, a data storage device operable to store data including identification...http://www.google.de/patents/US7663494?utm_source=gb-gplus-sharePatent US7663494 - Networked RF tag for tracking people by means of loyalty cards
