The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 11, 2025
Filed:
Feb. 25, 2021
Avery Dennison Retail Information Services Llc, Mentor, OH (US);
Ian J. Forster, Chelmsford, GB;
Avery Dennison Retail Information Services LLC, Mentor, OH (US);
Abstract
RFID-based electronic surveillance article systems are provided with first and second receiving antennas. An RF signal is transmitted to an RFID device, which transmits a return signal that is received by the receiving antennas. A position of the RFID device may be determined based on a difference between the strength of the return signal when received by the first antenna and the strength of the return signal when received by the second antenna. If RF signals are transmitted by the receiving antennas, the position of the RFID device may be determined by changing the strengths of the RF signals transmitted by each antenna and comparing the strength of the RF signal transmitted by the first antenna when the RFID device is at a threshold for receiving the signal to the strength of the RF signal transmitted by the second antenna when the RFID device is at the threshold.