Secure passive RFID tag with seal

Title: Secure passive RFID tag with seal

A secure passive RFID tag system comprises at least one base station and at least one passive RFID tag. The tag includes a fiber optic cable with the cable ends sealed within the tag and the middle portion forming an external loop. The loop may be secured to at least portions of an object. The tag transmits and receives an optical signal through the fiber optic cable, and the cable is configured to be damaged or broken in response to removal or tampering attempts, wherein the optical signal is significantly altered if the cable is damaged or broken. The tag transmits the optical signal in response to receiving a radio signal from the base station and compares the transmitted optical signal to the received optical signal. If the transmitted optical signal and the received optical signal are identical, the tag transmits an affirmative radio signal to the base station.

Inventors:: Nekoogar, Faranak; Reynolds, Matthew; Lefton, Scott; Dowla, Farid; Twogood, Richard

Issue Date:: 2017-11-14

OSTI Identifier:: 1408906

Assignee:: Dirac Solutions, Inc. (Pleasanton, CA) LLNL

Patent Number(s):: 9,818,273

Application Number:: 14/695,991

Contract Number:: AC52-07NA27344

Resource Relation:: Patent File Date: 2015 Apr 24

Research Org:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Org:: USDOE

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING; 36 MATERIALS SCIENCE

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Other works cited in this record:

Self-monitoring seal
patent, April 1981

Stieff, Lorin; Stieff, Charles
US Patent Document 4,262,284
URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F4262284

Apparatus for monitoring metabolism in body organs
patent, March 1982

Jobsis, Frans; Keizer, Johannes; Overaker, Ronald
US Patent Document 4,321,930
URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F4321930

Field splice assembly for tactical fiber optic cable
patent, March 1989

Lafaw, Donald
US Patent Document H595
URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2FH000595

Attachment and disengagement tool for bayonet type optical fiber connector
patent, July 1991

Peterson, Matthew
US Patent Document 5,031,981
URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F5031981

Electronic security device
patent, March 1992

Eschbach, Eugene; LeBlanc, Edward; Griffin, Jeffrey
US Patent Document 5,097,253
URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F5097253

Security method and apparatus
patent, April 1993

Conrad, Rodney
US Patent Document 5,202,673
URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F5202673

Electronic security bonding device
patent, August 1997

Houser, Peter
US Patent Document 5,656,996
URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F5656996

Seal system
patent, May 2000

Kadner, Steven; Resnik, William; Auerbach, Micha
US Patent Document 6,069,563
URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F6069563

Tamper detection prevention for an object control and tracking system
patent, July 2001

Maloney, William
US Patent Document 6,262,664
URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F6262664

Radio frequency identification transponder having a high gain antenna configuration
patent, November 2001

Brady, Michael; Duan, Dah-Weih; Kodukula, Venkata
US Patent Document 6,320,509
URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F6320509

Tamper monitoring article, system and method
patent, November 2006

Kittel, Mark; Miglionico, Joseph; Sandt, Richard
US Patent Document 7,135,973
URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F7135973

Cable lock for security system
patent, September 2007

Bradus, Robert; Milburn, Lawrence; Watson, James
US Patent Document 7,274,293
URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F7274293

Tamper monitoring system and method
patent, December 2008

Worthy, David; Glasser, Charles; Sidi, Yazid
US Patent Document 7,471,203
URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F7471203

Cable alarm security device
patent, January 2009

Marsilio, Ronald; Fawcett, Christopher
US Patent Document 7,474,209
URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F7474209

Apparatus for monitoring a mobile object including a partitionable strap
patent, December 2009

Sempek, David
US Patent Document 7,636,047
URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F7636047

Shipping container seal monitoring device, system and method
patent, May 2011

Francis, Richard; Mandry, James; Holigan, David
US Patent Document 7,936,266
URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F7936266

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US Patent Document 8,446,278
URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F8446278

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US Patent Document 9,088,372
URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN%2F9088372

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US Patent Document 09/862876; 20010022552
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220010022552%22.PGNR.&OS=DN/20010022552&RS=DN/20010022552

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patent-application, March 2004

Doss, Donald G.; Hardcastle, David S.
US Patent Document 10/247381; 20040057691
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220040057691%22.PGNR.&OS=DN/20040057691&RS=DN/20040057691

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US Patent Document 11/081930; 20050231365
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220050231365%22.PGNR.&OS=DN/20050231365&RS=DN/20050231365

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US Patent Document 11/010732; 20060109115
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US Patent Document 11/299174; 20060168644
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US Patent Document 11/333122; 20070164863
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220070164863%22.PGNR.&OS=DN/20070164863&RS=DN/20070164863

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patent-application, September 2007

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US Patent Document 11/366253; 20070207284
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220070207284%22.PGNR.&OS=DN/20070207284&RS=DN/20070207284

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patent-application, January 2008

Barnes, Brandon A.; Billman, Bradley S.; Kerr, Sean M.
US Patent Document 11/479254; 20080013888
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220080013888%22.PGNR.&OS=DN/20080013888&RS=DN/20080013888

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US Patent Document 11/664020; 20080256991
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220080256991%22.PGNR.&OS=DN/20080256991&RS=DN/20080256991

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US Patent Document 12/138175; 20080309487
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220080309487%22.PGNR.&OS=DN/20080309487&RS=DN/20080309487

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US Patent Document 11/933024; 20090111393
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220090111393%22.PGNR.&OS=DN/20090111393&RS=DN/20090111393

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US Patent Document 12/566855; 20110074582
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220110074582%22.PGNR.&OS=DN/20110074582&RS=DN/20110074582

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US Patent Document 13/034358; 20110244798
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220110244798%22.PGNR.&OS=DN/20110244798&RS=DN/20110244798

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patent-application, June 2012

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US Patent Document 12/965893; 20120144885
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220120144885%22.PGNR.&OS=DN/20120144885&RS=DN/20120144885

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patent-application, March 2013

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US Patent Application 13/229383; 20130064509
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220130064509%22.PGNR.&OS=DN/20130064509&RS=DN/20130064509

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patent-application, April 2014

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US Patent Application 14/057750; 20140109631
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220140109631%22.PGNR.&OS=DN/20140109631&RS=DN/20140109631

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patent-application, August 2014

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US Patent Application 14/350028; 20140243442
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220140243442%22.PGNR.&OS=DN/20140243442&RS=DN/20140243442

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patent-application, October 2014

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US Patent Application 13/869041; 20140322452
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220140322452%22.PGNR.&OS=DN/20140322452&RS=DN/20140322452

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URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220150015393%22.PGNR.&OS=DN/20150015393&RS=DN/20150015393

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URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220150043308%22.PGNR.&OS=DN/20150043308&RS=DN/20150043308

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URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220150108300%22.PGNR.&OS=DN/20150108300&RS=DN/20150108300

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uS Patent Document 14/203372; 20150254961
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220150254961%22.PGNR.&OS=DN/20150254961&RS=DN/20150254961

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US Patent Document 15/118932; 20160356963
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220160356963%22.PGNR.&OS=DN/20160356963&RS=DN/20160356963

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US Patent Document 15/118926; 20160356964
URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220160356964%22.PGNR.&OS=DN/20160356964&RS=DN/20160356964

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