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Referenced by

Citing PatentFiling dateIssue dateOriginal AssigneeTitle
US400048819 Apr 197428 Dec 1976Label alarm system
US40557968 Nov 197625 Oct 1977Cable support and locator structure
US411990824 Aug 197710 Oct 1978A. P. C. Industries, Inc.Method for locating buried markers which are disposed along the path of an underground conductor
US41602091 Jul 19773 Jul 1979Resonant circuit excitation method and apparatus
US421534231 Mar 197829 Jul 1980Intex Inc.Merchandise tagging technique
US447645923 Oct 19819 Oct 1984Knogo CorporationTheft detection method and apparatus in which the decay of a resonant circuit is detected
US45090395 Jul 19832 Apr 1985Minnesota Mining and Manufacturing CompanyShielded, closely spaced transmit-receiver antennas for electronic article surveillance system
US45311175 Jul 198323 Jul 1985Minnesota Mining and Manufacturing CompanyVariable frequency RF electronic surveillance system
US460991119 Jul 19852 Sep 1986Minnesota Mining and Manufacturing CompanyVariable frequency RF electronic surveillance system
US463497517 Sep 19846 Jan 1987Progressive Dynamics, Inc.Method and apparatus for producing electromagnetic surveillance fields
US464261316 Mar 198410 Feb 1987Knogo CorporationElectronic theft detection apparatus with responder elements on protected articles
US46671856 Dec 198519 May 1987Minnesota Mining and Manufacturing CompanyWireless synchronization system for electronic article surveillance system
US47981759 Oct 198617 Jan 1989Alfa-Laval Agri, Inc.Electronic identification system
US488857916 Sep 198819 Dec 1989Minnesota Mining and Manufacturing CompanyFalse alarm minimization and direction determination methods
US502549211 Apr 199018 Jun 1991Texas Instruments Deutschland GmbHDamping circuit for the antenna resonance circuit of a radio transmitter-receiver
US503630822 Dec 198930 Jul 1991N.V. Nederlandsche Apparatenfabriek NedapIdentification system
US508311331 Jan 199021 Jan 1992Texas Instruments IncorporatedInductive coupled object identification system and method
US53652357 Sep 199315 Nov 1994Ford Motor CompanyMethod and apparatus for reducing residual RF power in a transmitter/receiver antenna
US53827801 Oct 199317 Jan 1995Duncan Industries Parking Control Systems Corp.Portable time metering device
US544777927 Jan 19935 Sep 1995Tokai Electronics Co., Ltd.Resonant tag and method of manufacturing the same
US558925122 Aug 199531 Dec 1996Tokai Electronics Co., Ltd.Resonant tag and method of manufacturing the same
US568281422 Aug 19954 Nov 1997Tokai Electronics Co., Ltd.Apparatus for manufacturing resonant tag
US57867644 Mar 199728 Jul 1998Voice activated electronic locating systems
US57986937 Jun 199525 Aug 1998Electronic locating systems
US605775614 Aug 19982 May 2000Electronic locating systems
US615092117 Oct 199721 Nov 2000PinPoint CorporationArticle tracking system
US63885692 May 200014 May 2002Electronic locating methods
US64834279 Mar 200019 Nov 2002RF Technologies, Inc.Article tracking system
US651888429 Mar 199911 Feb 2003Matsushita Electric Industrial Co., Ltd.Electric resonance element, detection apparatus and moving vehicle control system
US657370631 Jan 20013 Jun 2003IntelliJoint Systems Ltd.Method and apparatus for distance based detection of wear and the like in joints
US68128242 Mar 20002 Nov 2004RF Technologies, Inc.Method and apparatus combining a tracking system and a wireless communication system
US689146914 May 200210 May 2005Electronic locating systems
US73212969 May 200522 Jan 2008Thomas J. EngellennerElectronic locating systems
US757523413 Apr 200418 Aug 2009Bally Gaming, Inc.Wireless monitoring of playing cards and/or wagers in gaming
US775377930 Jun 200613 Jul 2010Bally Gaming, Inc.Gaming chip communication system and method
US790297118 Jan 20088 Mar 2011Xalotroff Fund V, Limtied Liability CompanyElectronic locating systems
US80700702 Dec 20086 Dec 2011Murata Manufacturing Co., Ltd.Antenna device and radio frequency IC device
USRE296107 May 197511 Apr 1978Knogo CorporationField strength uniformity control system