1
David L Ladner, Andrea J Grazzini, Ronald E Konezny: Mobile locator system. Peoplenet, Westman Champlin & Kelly PA, December 18, 2001: US06331825 (216 worldwide citation)

A locator system comprises a locator device, a control center, a workstation and a computerized interface. The control center and the locator device are configured to communicate via cellular and pager signals.


2
David L Ladner, Andrea J Grazzini: Locator device. Peoplenet, Westman Champlin & Kelly P A, January 14, 1997: US05594425 (185 worldwide citation)

A locator apparatus includes a receiver for receiving location information indicative of a location of the receiver. A memory is coupled to the receiver and stores the location information. A cellular transmitter is coupled to the memory and the receiver and transmits the location information to a s ...


3
David L Ladner, Andrea J Grazzini: Locator device. Peoplenet, Westman Champlin & Kelly PA, June 13, 2000: US06075458 (87 worldwide citation)

A locator apparatus includes a receiver for receiving location information indicative of a location of the receiver. A memory is coupled to the receiver and stores the location information. A cellular transmitter is coupled to the memory and the receiver and transmits the location information to a s ...