1
Martin H Singer, Daniel Tell, Anthony Kobrinetz: Personal locator system. Motorola, Jeffrey G Toler, Kevin A Buford, January 16, 1996: US05485163 (448 worldwide citation)

A system and method for locating a portable locator device in a communications network. The portable locator unit (PLU) (4) is activated either by an external signal (62) generated in response to remote activation source, such as a subscriber (6, 8) or PLU detector (106, 108), or by an internal acti ...


2
Michael Burke, Ken Felix, Daniel Tell, James Williams: Networked cellular radiotelephone systems. Motorola, Rolland R Hackbart, April 12, 1988: US04737978 (176 worldwide citation)

Adjacent cellular systems (101-103) are interconnected to form a network providing telephone coverage to mobiles located throughout their combined coverage areas (111-113). Each networked cellular system (101-103) includes base sites (412, 414, 416) located in cells (402, 404, 406) and a control ter ...


3
Martin H Singer, Daniel Tell, Anthony Kobrinetz: Personal locator system. Motorola, LU LIYING, July 3, 1996: CN95190245

The invention relates to a system and method for locating a portable locator device in a communications network. The portable locator unit (PLU) (4) is activated either by an external signal (62) generated in response to remote activation source, such as a subscriber (6, 8) or PLU detector (106, 108 ...