×

System for identifying particular objects

  • US 4,739,328 A
  • Filed: 07/14/1986
  • Issued: 04/19/1988
  • Est. Priority Date: 07/14/1986
  • Status: Expired due to Term
First Claim
Patent Images

1. In combination in a system including a reader and a transponder displaced from the reader for identifying an object associated with the transponder,means at the reader for transmitting interrogating signals at a particular frequency to the transponder,means disposed at the transponder and responsive to the interrogating signals for generating successive pluralities of signal cycles in a pattern individual to the object, the signal cycles in each plurality including signal cycles at both first and second frequencies in a pattern representative of a binary "1" or a binary "0",means disposed at the transponder for transmitting the successive pluralities of signal cycles at the first and second frequencies to the reader, andmeans at the reader for decoding the pattern of the frequencies of the signal cycles in each of the successive pluralities to identify the object.

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