Impinj, Inc.

Northrop Grumman Systems Corporation

Other

Inpinj, Inc.

Northrop Grumman Space & Mission Systems Corporation Space Technology

Scott A Cooper

Christopher J Diorio

Matthew Robshaw

Todd E Humes

Kurt Eugene Sundstrom

Theron Stanford

Aanand Esterberg

Ronald A Oliver

William T Colleran

Harley K Heinrich

Stuart T Linsky

John D Hyde

Tan Mau Wu

Chad A Lindhorst

Kambiz Rahimi

Alberto Pesavento

Vadim Gutnik

Reginald Jue

Sandesh Doddameti

Jayasuryan Iyer

Balaji Shyamkumar

Ali Aiouaz

Christopher W Walker

Esmaell Yousefi

Larry Arnstein

Ali Robert Golshan

Gregory T Kavounas

Joel D Peshkin

Michael H Thomas

Thomas G Anderl

Mark E Bever

Amir Sarajedini

Yael Gregory Maguire

Paul F Dietrich

David A Wright

Harvey L Berger

Vincent Nguyen

Dennis A Nivens

Lisa A Moy-Yee

Fred C Tramm

Robert W White

David D Dressler

Kevin M Yasui

Andrew T Nguyen

An RFID-based item tracking system may use statistical methods to determine whether a tag or tagged item that does not respond when inventoried is present in a particular zone or reader antenna field-of-view. In one embodiment, the item tracking system may determine an observability of an item based on one or more initial trials. Upon not detecting the item in one or more subsequent trials, the item tracking system may estimate whether the item is still present based on the observability.

RFID-based item presence detection

Methods and systems are described for authorizing an item with an RFID tag to leave a facility. In one embodiment, a mobile device receives or determines an exit code (EC) to write into the tag in response to providing authorizing information. The EC may be based on information stored in the tag such as the tag's item identifier or other tag information (collectively an item identifier or II), a ticket value, other information such as the OC, a mobile identity or location, or any other suitable information. Upon verification of the EC, the tagged item is allowed to leave the facility. In another embodiment, the mobile device stores an item identifier (II) associated with the tag and provides authorizing information. Upon verifying the authorizing information and confirming that the stored II corresponds to the tagged item's II, the tagged item is allowed to leave the facility.

Exit-code-based RFID loss-prevention system

Embodiments are directed to restricting access to Radio Frequency Identification (RFID) tag information based on location. Access to RFID tag information may be restricted at the reader level, at the requester level, and at the network level. When reader-level restrictions exist, devices may be prevented from inventorying tags and retrieving information from tags. When requester-level restrictions exist, a requester or device may be prevented from receiving tag information from inventoried tags or a network. When network-level restrictions exist, a network may discard or otherwise restrict tag information received from devices.

Location-based access to RFID tag information

A Radio Frequency Identification (RFID) system including an RFID reader and a reader proxy authenticates itself to a verification authority. The proxy receives a proxy challenge from a verification authority and determines a proxy response based on the proxy challenge and a proxy key known to the proxy. The proxy response is then sent to the verification authority along with an identifier for the reader. The reader then authenticates an RFID tag by sending a tag response to the verification authority, which determines whether the reader is authentic based on the authenticity of the proxy response.

Proxy-based reader authentication by trusted authority

A Radio Frequency Identification (RFID) reader containing a reader key authenticates an RFID tag containing a tag key by receiving a tag identifier from the tag; challenging the tag with a tag challenge; receiving a tag response based at least on the tag challenge and the tag key but not including the tag key; sending a second message including at least the tag identifier and the tag response to a verification authority; and receiving a reply from the verification authority. The reader and the verification authority may mutually authenticate each other before, during, or after the tag authentication process. The verification authority may notify a designated party if a response is incorrect.

RFID tag and reader authentication by trusted authority

An authentication method includes RFID tags authenticating RFID readers. A tag sends a tag identifier and a reader challenge to a reader in response to one or more commands from the reader. The reader then either derives a response to the reader challenge itself or has a verification authority derive the response. The response may be derived from parameter(s) in the reader challenge, and may be derived using a cryptographic key. The reader then sends the response to the tag along with another command. The tag verifies the response before executing instruction(s) included in the command.

Enhanced RFID tag authentication

Growing community of inventors

Torrance, CA, United States of America

Scott A Cooper