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Cellular telephone anti-fraud system

  • US 6,047,174 A
  • Filed: 03/02/1998
  • Issued: 04/04/2000
  • Est. Priority Date: 06/08/1993
  • Status: Expired due to Term
First Claim
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1. A transmitter identification system comprising:

  • a plurality of transmitters each for generating a transmitter signal including internal data traits and external signal traits;

    receiving means located remote from said transmitters for receiving said transmitter signal;

    characterizing means connected to said receiving means for characterizing one of said transmitters and for generating a plurality of characterizing signals for said one transmitter, wherein the characterizing means generates said plurality of characterizing signals by measuring features of said external traits of said one of said transmitters from at least one of a first category including variations of specified parameters of said one of said transmitter, and a second category including variations in non-specified parameters; and

    converting means connected to said characterizing means for converting said plurality of characterizing signals into a security pattern wherein said security pattern is used to identify said one of said transmitters.

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