An asset securing and tracking system (30) operates in conjunction with a wireless communication network (65) for tracking a portable asset (35). The system (30) includes a tracking device (31) adapted to be attached to the portable asset (35) and communicate with the wireless communication network (65)....http://www.google.es/patents/US6975222?utm_source=gb-gplus-sharePatente US6975222 - Asset tracking apparatus and method
