US 12,093,767 B1
RFID tags with public and private inventory states
Christopher J Diorio, Shoreline, WA (US); and Joel Peshkin, San Juan Capistrano, CA (US)
Assigned to Impinj, Inc., Seattle, WA (US)
Filed by Impinj, Inc., Seattle, WA (US)
Filed on Oct. 21, 2022, as Appl. No. 17/970,729.
Application 17/970,729 is a continuation of application No. 17/371,326, filed on Jul. 9, 2021, granted, now 11,481,592.
Application 17/371,326 is a continuation of application No. 16/556,587, filed on Aug. 30, 2019, granted, now 11,062,190, issued on Jul. 13, 2021.
Application 16/556,587 is a continuation of application No. 16/056,382, filed on Aug. 6, 2018, granted, now 10,402,710, issued on Sep. 3, 2019.
Application 16/056,382 is a continuation in part of application No. 15/690,597, filed on Aug. 30, 2017, granted, now 10,049,317, issued on Aug. 14, 2018.
Application 15/690,597 is a continuation of application No. 13/854,580, filed on Apr. 1, 2013, abandoned.
Application 13/854,580 is a continuation of application No. 12/697,895, filed on Feb. 1, 2010, abandoned.
Claims priority of provisional application 61/149,654, filed on Feb. 3, 2009.
This patent is subject to a terminal disclaimer.
Int. Cl. G06K 19/07 (2006.01)
CPC G06K 19/0723 (2013.01) 18 Claims
OG exemplary drawing
 
1. A method for a radio frequency identification (RFID) reader to communicate with RFID tags in a private state and in a public state, the method comprising:
performing a first inventory round by transmitting, without verification information, a first inventorying command instructing both a first plurality of RFID tags in the private state and a second plurality of RFID tags in the public state to participate in the first inventory round, but only receiving responses from the first plurality of RFID tags during the first inventory round, wherein the second plurality of RFID tags are arranged not to respond to an inventorying command without verifying the RFID reader using the verification information; and
performing a second inventory round by:
transmitting a second inventorying command instructing both the first and the second plurality of RFID tags to participate in a second inventory round;
transmitting the verification information for the second plurality of RFID tags to verify the RFID reader; and
in response to transmitting the verification information, receiving responses from the second plurality of RFID tags in addition to the first plurality of RFID tags during the second inventory round.