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:
May. 31, 2022
Filed:
Jul. 03, 2018
Haltian Oy, Oulu, FI;
Teemu Vaattovaara, Oulu, FI;
Ville Ylläsjärvi, Oulu, FI;
Marko Parttimaa, Oulu, FI;
Jussi Kivilinna, Oulu, FI;
Aleksandre Pekki, Oulu, FI;
Juha Pikkarainen, Oulu, FI;
Pertti Kujala, Oulu, FI;
Jyrki Okkonen, Oulu, FI;
HALTIAN OY, Oulu, FI;
Abstract
Active radio-frequency identification, RFID, tag, and a product surveillance method using active RFID tags. The method includes: transmitting (), by an active RFID tag, continuously a signal comprising an own identifier according to a predetermined schedule; receiving (), by the active RFID tag, continuously a plurality of signals comprising a plurality of foreign identifiers transmitted by a plurality of other active RFID tags according to the predetermined schedule; measuring (), by the active RFID tag, a received signal strength indication, RSSI, of each received signal; storing (), by the active RFID tag, each foreign identifier of a signal whose RSSI exceeds a predetermined strength threshold; detecting (), by the active RFID tag, that a signal with a stored foreign identifier is no more received according to the predetermined schedule and marking (), by the active RFID tag, said stored foreign identifier.