An agent based system utilizes a Personal Digital Assistant (PDA)-based, Global Positioning System (GPS)-enabled information gathering agent to create a customized offer information summary based on the location of a user and one or more items of interest. One or more items of interest are obtained from...http://www.google.de/patents/US6317718?utm_source=gb-gplus-sharePatent US6317718 - System, method and article of manufacture for location-based filtering for shopping agent in the physical world
