75519438
Jul 15, 1998
May 8, 2001
Portable wireless system for emergency location and identification of a user in an emergency life threatening and non-life threatening situation, namely, a transmitter carried by a user for transmitting location and identification information about user from the user to a central station and a tracking system comprising a plurality of receivers for triangulating the user's signal for the purpose of tracking the user
Electrical and Scientific Apparatus