×

Backscatter Limited Tags

  • US 20090002176A1
  • Filed: 06/28/2007
  • Published: 01/01/2009
  • Est. Priority Date: 06/28/2007
  • Status: Active Grant
First Claim
Patent Images

1. A method of communicating with a population of radio frequency identification (RFID) tags, comprising:

  • transmitting a first interrogation signal;

    receiving a response to the first interrogation signal from at least one RFID tag at a first received signal strength, wherein the response includes at least a portion of a first identification code; and

    transmitting a second interrogation signal that includes a request for confidential information, a command to transmit a response to the second interrogation signal at a secure power level, and said first identification code.

View all claims
  • 4 Assignments
Timeline View
Assignment View
    ×
    ×