×

Radio frequency identification system and method

  • US 6,732,923 B2
  • Filed: 04/04/2001
  • Issued: 05/11/2004
  • Est. Priority Date: 04/04/2001
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of identifying an item comprising the steps of:

  • transmitting a plurality of different first signals having a plurality of different frequencies;

    receiving second signals having second frequencies from an item label associated with the item, each second frequency corresponding to a known data bit position of an N-bit item identification number associated with the item;

    determining third frequencies associated with the item label which were not received from the item label, each third frequency corresponding to another known data bit position of the N-bit item identification number associated with the item; and

    determining the N-bit item identification number from the second and third frequencies, including the substeps of assigning first values equal to a first binary value to each known data bit position of the N-bit item identification number for the second frequencies; and

    assigning second values equal to a second binary value to each known data bit position of the N-bit item identification number for the third frequencies.

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