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Patentes

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Patente citante Fecha de presentación Fecha de emisión Cesionario original Título
US393812520 Feb 197410 Feb 1976Minnesota Mining and Manufacturing CompanyAntipilferage system and marker therefor
US398355214 Ene 197528 Sep 1976American District Telegraph CompanyPilferage detection systems
US399006520 Feb 19752 Nov 1976The Magnavox CompanyTheft detection system
US40742494 Feb 197714 Feb 1978Knogo CorporationMagnetic detection means
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US412374928 Mar 197731 Oct 1978Bizerba-Werke Wilhelm Kraut KGMethod and system for determining the presence of objects within a particular surveillance area, in particular for prevention of shoplifting
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US422251718 Sep 197816 Sep 1980Samuel Cornelious EvansMagnetic marker
US42491675 Jun 19793 Feb 1981Magnavox Government and Industrial Electronics CompanyApparatus and method for theft detection system having different frequencies
US429886223 Abr 19793 Nov 1981Allied Chemical CorporationAmorphous antipilferage marker
US434290427 Oct 19803 Ago 1982Minnesota Mining and Manufacturing CompanyLightweight ferromagnetic marker for the detection of objects having markers secured thereto
US438428131 Oct 198017 May 1983Knogo CorporationTheft detection apparatus using saturable magnetic targets
US44132544 Sep 19811 Nov 1983Sensormatic Electronics CorporationCombined radio and magnetic energy responsive surveillance marker and system
US448418413 Ago 198120 Nov 1984Allied CorporationAmorphous antipilferage marker
US449548727 Oct 198222 Ene 1985Allied CorporationAmorphous antipilferage marker
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US456892113 Jul 19844 Feb 1986Knogo CorporationTheft detection apparatus and target and method of making same
US458152426 Abr 19838 Abr 1986Minnesota Mining and Manufacturing CompanyFlexible ferromagnetic marker for the detection of objects having markers secured thereto
US462254226 Jun 198511 Nov 1986Controlled Information CorporationMagnetic article surveillance system, method and coded marker
US464261316 Mar 198410 Feb 1987Knogo CorporationElectronic theft detection apparatus with responder elements on protected articles
US466538713 Jul 198312 May 1987Knogo CorporationMethod and apparatus for target deactivation and reactivation in article surveillance systems
US468215412 Feb 198621 Jul 1987E.A.S. Technologies, Inc.Label for use in anti-theft surveillance system
US468493018 Mar 19864 Ago 1987Knogo CorporationMethod and apparatus for deactivating targets used in electromagnetic type article surveillance systems
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US474389024 Nov 198610 May 1988Vacummschmelze GmbHDeactivatable security label for anti-theft systems
US475150010 Feb 198714 Jun 1988Knogo CorporationDetection of unauthorized removal of theft detection target devices
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US479904517 Jul 198717 Ene 1989E.A.S. Technologies, Inc.Method of detecting a label used in an anti-theft surveillance system
US491062511 Oct 198820 Mar 1990Eastman Kodak CompanyArticle surveillance apparatus and systems for computer data disks
US491462318 Sep 19873 Abr 1990Hudson-Allen LimitedDigital processing of sensor signals for reading binary storage media
US496718419 Sep 198930 Oct 1990Eastman Kodak CompanyComputer disk with security protection
US501238024 Ago 198930 Abr 1991Eastman Kodak CompanyArticle surveillance protection of flexible magnetic computer data storage disks
US512672017 Ene 199130 Jun 1992Knogo CorporationMethod and apparatus for deactivating magnetic targets
US514620420 Dic 19908 Sep 1992Knogo CorporationTheft detection apparatus and flattened wire target and method of making same
US52105248 May 199111 May 1993Minnesota Mining and Manufacturing CompanyElectro-magnetic desensitizer
US528898025 Jun 199222 Feb 1994Kingsley Library Equipment CompanyLibrary check out/check in system
US534112515 Ene 199223 Ago 1994Sensormatic Electronics CorporationDeactivating device for deactivating EAS dual status magnetic tags
US540158410 Sep 199328 Mar 1995Knogo CorporationSurveillance marker and method of making same
US57867644 Mar 199728 Jul 1998Voice activated electronic locating systems
US57986937 Jun 199525 Ago 1998Electronic locating systems
US580506518 Mar 19938 Sep 1998Minnesota Mining and Manufacturing CompanyElectro-magnetic desensitizer
US605775614 Ago 19982 May 2000Electronic locating systems
US616663617 May 199926 Dic 2000Vacuumschmelze GmbHMarker for use in a magnetic anti-theft security system and method for making same
US631374624 Abr 20006 Nov 2001Vacuumschelmze GmbHMagnet marker strip and a method of producing a magnetic marker strip
US63885692 May 200014 May 2002Electronic locating methods
US66117835 Ene 200126 Ago 2003NocWatch, Inc.Attitude indicator and activity monitoring device
US689146914 May 200210 May 2005Electronic locating systems
US73212969 May 200522 Ene 2008Thomas J. EngellennerElectronic locating systems
US790297118 Ene 20088 Mar 2011Xalotroff Fund V, Limtied Liability CompanyElectronic locating systems
USRE296107 May 197511 Abr 1978Knogo CorporationField strength uniformity control system
USRE324273 Jun 198526 May 1987Amorphous antipilferage marker
USRE324283 Jun 198526 May 1987Allied CorporationAmorphous antipilferage marker

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