A system and method is provided that enables a carrier of a mailpiece, such as a national postal service, to track a mailpiece as it passes from the control of a first carrier to the control of another, second carrier. The tracking of the mailpiece continues until the mailpiece is delivered, by the second...http://www.google.com.au/patents/US20030009351?utm_source=gb-gplus-sharePatent US20030009351 - Method and system for cross-carrier parcel tracking
