US 12,125,364 B1
Environment-based RFID IC behavior
Christopher J. Diorio, Shoreline, WA (US); Harley Heinrich, Snohomish, WA (US); Matthew Robshaw, Seattle, WA (US); Theron Stanford, Seattle, WA (US); Charles J. T. Peach, Seattle, WA (US); John D. Hyde, Corvallis, OR (US); and Tan Mau Wu, Seattle, WA (US)
Filed by Impinj, Inc., Seattle, WA (US)
Filed on Oct. 20, 2023, as Appl. No. 18/490,786.
Application 18/490,786 is a continuation of application No. 17/749,292, filed on May 20, 2022, granted, now 11,798,392.
Application 17/749,292 is a continuation of application No. 17/134,729, filed on Dec. 28, 2020, granted, now 11,341,837, issued on May 24, 2022.
Application 17/134,729 is a continuation of application No. 16/382,233, filed on Apr. 12, 2019, granted, now 10,878,685, issued on Dec. 29, 2020.
Claims priority of provisional application 62/688,116, filed on Jun. 21, 2018.
This patent is subject to a terminal disclaimer.
Int. Cl. G08B 13/24 (2006.01); G06K 7/10 (2006.01); G06K 19/07 (2006.01); G08B 21/18 (2006.01)
CPC G08B 21/182 (2013.01) [G06K 7/10366 (2013.01); G06K 19/0723 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A Radio Frequency Identification (RFID) integrated circuit (IC) configured to provide an alert, the RFID IC comprising:
a memory configured to store data;
a transceiver circuit configured to receive commands and send replies; and
a processing block coupled to the memory and the transceiver circuit and configured to:
perform a first measurement of an environmental parameter at a first time;
determine a difference by comparing the first measurement to a second measurement of the environmental parameter measured at a second time, or to a baseline value; and
if the difference meets a threshold, then provide the alert by:
participating in an inventory round; and
causing the transceiver circuit to send, in the inventory round, a reply having an indicator for the alert, wherein the indicator is at least one of:
a value of one or more bits in the reply, and
a timing adjustment of the reply.