Identification system

  • US 6,784,787 B1
  • Filed: 05/15/2000
  • Issued: 08/31/2004
  • Est. Priority Date: 11/14/1997
  • Status: Expired due to Term
First Claim
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1. A method of identifying a plurality of transponders in an interrogation comprising transmitting an interrogation signal to the transponders and receiving response signals from the transponders, each transponder being capable of transmitting the response signal at any time during a waiting period, wherein each transponder alters the maximum length of the waiting period during the interrogation process for retransmitting the response signal at a random time during that altered waiting period.

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