FR763681A - A method of identifying objects by modifying a magnetic field - Google Patents

A method of identifying objects by modifying a magnetic field

Info

Publication number
FR763681A
FR763681A FR763681DA FR763681A FR 763681 A FR763681 A FR 763681A FR 763681D A FR763681D A FR 763681DA FR 763681 A FR763681 A FR 763681A
Authority
FR
Grant status
Grant
Patent type
Prior art keywords
modifying
method
magnetic field
identifying objects
identifying
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Other languages
French (fr)
Inventor
Picard
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Grant date

Links

Classifications

    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/22Electrical actuation
    • G08B13/24Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2408Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using ferromagnetic tags
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/22Electrical actuation
    • G08B13/24Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2428Tag details
    • G08B13/2431Tag circuit details
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/22Electrical actuation
    • G08B13/24Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2428Tag details
    • G08B13/2437Tag layered structure, processes for making layered tags
    • G08B13/2445Tag integrated into item to be protected, e.g. source tagging
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/22Electrical actuation
    • G08B13/24Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2465Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468Antenna in system and the related signal processing
    • G08B13/2471Antenna signal processing by receiver or emitter
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/22Electrical actuation
    • G08B13/24Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2465Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468Antenna in system and the related signal processing
    • G08B13/2474Antenna or antenna activator geometry, arrangement or layout
FR763681A 1933-11-10 1933-11-10 A method of identifying objects by modifying a magnetic field Expired FR763681A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR763681T 1933-11-10

Publications (1)

Publication Number Publication Date
FR763681A true FR763681A (en) 1934-05-04

Family

ID=9180749

Family Applications (1)

Application Number Title Priority Date Filing Date
FR763681A Expired FR763681A (en) 1933-11-10 1933-11-10 A method of identifying objects by modifying a magnetic field

Country Status (1)

Country Link
FR (1) FR763681A (en)

Cited By (67)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3184730A (en) * 1962-07-30 1965-05-18 Robert H Irish Intrusion detection system
US3500373A (en) * 1966-05-06 1970-03-10 Nat Bank Of North America The Method and apparatus for article theft detection
DE2035356A1 (en) * 1969-07-11 1971-02-04 Minnesota Mining & Mfg
US3631442A (en) * 1968-03-22 1971-12-28 Robert E Fearon Anti-shoplifting system
US3665449A (en) * 1969-07-11 1972-05-23 Minnesota Mining & Mfg Method and apparatus for detecting at a distance the status and identity of objects
FR2161773A1 (en) * 1971-11-29 1973-07-13 See International
US3765007A (en) * 1969-07-11 1973-10-09 Minnesota Mining & Mfg Method and apparatus for detecting at a distance the status and identity of objects
DE2065828A1 (en) * 1969-07-11 1976-08-05 Minnesota Mining & Mfg Highly permeable tracer element - is ferromagnetic and of elongated form to facilitate detection of object in surveillance zone
DE2065827A1 (en) * 1969-07-11 1976-08-12 Minnesota Mining & Mfg Electromagnetic field generation in interrogation zone - uses several field generating devices and means for successive application of electrical energy
US3990065A (en) * 1975-02-20 1976-11-02 The Magnavox Company Theft detection system
US4063229A (en) * 1967-03-30 1977-12-13 Sensormatic Electronics Corporation Article surveillance
DE2732167A1 (en) * 1976-07-15 1978-01-26 Minnesota Mining & Mfg Marker to prevent theft and methods for manufacturing the marker element
DE2737129A1 (en) * 1976-08-18 1978-02-23 Knogo Corp A method and apparatus for increasing the selective response to harmonic in an object detection system
USRE29610E (en) * 1973-04-13 1978-04-11 Knogo Corporation Field strength uniformity control system
US4095214A (en) * 1976-06-17 1978-06-13 Knogo Corporation Electronic monitoring system and responder device
US4118693A (en) * 1977-05-09 1978-10-03 Knogo Corporation Method and apparatus for producing uniform electromagnetic fields in an article detection system
DE2823191A1 (en) * 1977-05-24 1978-11-30 Minnesota Mining & Mfg Improved system for anti-theft with achterfoermigen field- and detector coils
US4135184A (en) * 1977-08-31 1979-01-16 Knogo Corporation Electronic theft detection system for monitoring wide passageways
FR2427697A1 (en) * 1978-02-17 1979-12-28 Lichtblau George Antenna for theft of goods Detection system
US4309697A (en) * 1980-10-02 1982-01-05 Sensormatic Electronics Corporation Magnetic surveillance system with odd-even harmonic and phase discrimination
FR2512558A1 (en) * 1981-09-10 1983-03-11 Sensormatic Electronics Corp Electrical monitoring device with mobile antenna elements
US4384281A (en) * 1980-10-31 1983-05-17 Knogo Corporation Theft detection apparatus using saturable magnetic targets
WO1983002027A1 (en) * 1981-11-24 1983-06-09 Myong Shin Antitheft system
WO1983003203A1 (en) * 1982-03-15 1983-09-29 Progressive Dynamics Method and apparatus for theft detection systems
EP0121649A1 (en) * 1983-02-04 1984-10-17 Allied Corporation Amorphous antipilferage marker
EP0130286A2 (en) * 1983-06-30 1985-01-09 Knogo Corporation Method and apparatus for detection of targets in an interrogation zone
DE2066151C2 (en) * 1969-07-11 1985-02-28 Minnesota Mining & Mfg
EP0134404A1 (en) * 1983-07-13 1985-03-20 Knogo Corporation Method and apparatus for target deactivation and reactivation
US4510489A (en) * 1982-04-29 1985-04-09 Allied Corporation Surveillance system having magnetomechanical marker
US4510490A (en) * 1982-04-29 1985-04-09 Allied Corporation Coded surveillance system having magnetomechanical marker
DE3419785A1 (en) * 1983-10-20 1985-05-09 Sigma Security Inc Through security system
EP0078401B1 (en) * 1981-11-02 1985-08-07 Allied Corporation Amorphous antipilferage marker
US4535323A (en) * 1982-03-15 1985-08-13 Progressive Dynamics, Inc. Preamplifying and signal processing method and apparatus for theft detection systems
DE3505052A1 (en) * 1984-02-16 1985-08-22 Sigma Security Inc Through security system
US4568921A (en) * 1984-07-13 1986-02-04 Knogo Corporation Theft detection apparatus and target and method of making same
US4642613A (en) * 1984-03-16 1987-02-10 Knogo Corporation Electronic theft detection apparatus with responder elements on protected articles
US4684930A (en) * 1986-03-18 1987-08-04 Knogo Corporation Method and apparatus for deactivating targets used in electromagnetic type article surveillance systems
US4697170A (en) * 1985-10-31 1987-09-29 Minnesota Mining And Manufacturing Company Method for minimizing false alarms and electronic noise in electronic article surveillance systems.
US4710754A (en) * 1986-09-19 1987-12-01 Minnesota Mining And Manufacturing Company Magnetic marker having switching section for use in electronic article surveillance systems
USRE32627E (en) * 1981-09-10 1988-03-22 Sensormatic Electronics Corporation Electrical surveillance apparatus with moveable antenna elements
US4746908A (en) * 1986-09-19 1988-05-24 Minnesota Mining And Manufacturing Company Dual-status, magnetically imagable article surveillance marker
US4779076A (en) * 1987-05-20 1988-10-18 Controlled Information Corp. Deactivatable coded marker and magnetic article surveillance system
FR2619929A1 (en) * 1987-08-28 1989-03-03 Sensormatic Electronics Corp Electronic Monitoring System articles
US4823113A (en) * 1986-02-27 1989-04-18 Allied-Signal Inc. Glassy alloy identification marker
US4825197A (en) * 1988-02-01 1989-04-25 Minnesota Mining And Manufacturing Company Dual status magnetic marker having magnetically biasable flux collectors for us in electronic article surveillance systems
US4829288A (en) * 1987-11-30 1989-05-09 Minnesota Mining And Manufacturing Company Economic, multi-directionally responsive marker for use in electronic article surveillance systems
DE3837129A1 (en) * 1987-11-04 1989-05-18 Sensormatic Electronics Corp Marker for use in an article-ueberwachungsanlage and process for preparing the markers
US4857891A (en) * 1988-04-29 1989-08-15 Minnesota Mining And Manufacturing Company Random-filament, multi-directionally responsive marker for use in electronic article surveillance systems
US4884063A (en) * 1988-02-01 1989-11-28 Minnesota Mining And Manufacturing Company Dual status magnetic marker having magnetically biasable flux collectors for use in electronic article surveillance systems
EP0352513A2 (en) * 1988-07-29 1990-01-31 Knogo Corporation Load isolated article surveillance system and antenna assembly
EP0387970A1 (en) * 1989-03-17 1990-09-19 N.V. Nederlandsche Apparatenfabriek NEDAP Shoplifting detection system of the transmission type
US4967185A (en) * 1989-08-08 1990-10-30 Minnesota Mining And Manufacturing Company Multi-directionally responsive, dual-status, magnetic article surveillance marker having continuous keeper
US5146204A (en) * 1990-03-13 1992-09-08 Knogo Corporation Theft detection apparatus and flattened wire target and method of making same
US5288980A (en) * 1992-06-25 1994-02-22 Kingsley Library Equipment Company Library check out/check in system
US5405702A (en) * 1993-12-30 1995-04-11 Minnesota Mining And Manufacturing Company Method for manufacturing a thin-film EAS and marker
US5432499A (en) * 1993-05-27 1995-07-11 Minnesota Mining And Manufacturing Company Collector type article surveillance marker with continuous keeper
USRE35042E (en) * 1983-02-04 1995-09-26 Allied Corporation Amorphous antipilferage marker
US5614824A (en) * 1995-05-15 1997-03-25 Crane & Co., Inc. Harmonic-based verifier device for a magnetic security thread having linear and non-linear ferromagnetic characteristics
EP0848356A1 (en) 1996-12-12 1998-06-17 Arjo Wiggins S.A. Substrate comprising magnetic particles, security document and method for detecting them
EP0848355A1 (en) 1996-12-12 1998-06-17 N.V. Bekaert S.A. Method and apparatus for detecting the presence of particles in a substrate
US5808466A (en) * 1993-08-02 1998-09-15 Azkoyen Industrial, S.A. Process and device for high speed measurement and characterization of magnetic materials
US5825291A (en) * 1996-04-10 1998-10-20 Sentry Technology Corporation Electronic article surveillance system
US5992741A (en) * 1996-12-12 1999-11-30 Robertson; Paul Andrew Magnetic detection of security articles
US6598793B1 (en) 1996-12-12 2003-07-29 N.V. Bekaert S.A. Article recognition and verification
DE3942722B4 (en) * 1988-12-27 2005-05-12 Pitney Bowes, Inc., Stamford Ferromagnetic fibers for use in electronic article surveillance and process for producing same
EP1715466A2 (en) 2005-04-21 2006-10-25 Micromag 2000, S.L. A magnetic tag that can be activated/deactivated based on magnetic microwire and a method for obtaining the same
EP1933286A2 (en) 2006-12-15 2008-06-18 Micromag 2000, S.L. Magnetoacustic markers based on magnetic microwire, and method of obtaining the same

Cited By (82)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3184730A (en) * 1962-07-30 1965-05-18 Robert H Irish Intrusion detection system
US3500373A (en) * 1966-05-06 1970-03-10 Nat Bank Of North America The Method and apparatus for article theft detection
US4063229A (en) * 1967-03-30 1977-12-13 Sensormatic Electronics Corporation Article surveillance
US3631442A (en) * 1968-03-22 1971-12-28 Robert E Fearon Anti-shoplifting system
DE2035356A1 (en) * 1969-07-11 1971-02-04 Minnesota Mining & Mfg
US3665449A (en) * 1969-07-11 1972-05-23 Minnesota Mining & Mfg Method and apparatus for detecting at a distance the status and identity of objects
US3765007A (en) * 1969-07-11 1973-10-09 Minnesota Mining & Mfg Method and apparatus for detecting at a distance the status and identity of objects
DE2065828A1 (en) * 1969-07-11 1976-08-05 Minnesota Mining & Mfg Highly permeable tracer element - is ferromagnetic and of elongated form to facilitate detection of object in surveillance zone
DE2065827A1 (en) * 1969-07-11 1976-08-12 Minnesota Mining & Mfg Electromagnetic field generation in interrogation zone - uses several field generating devices and means for successive application of electrical energy
DE2066151C2 (en) * 1969-07-11 1985-02-28 Minnesota Mining & Mfg
FR2161773A1 (en) * 1971-11-29 1973-07-13 See International
USRE29610E (en) * 1973-04-13 1978-04-11 Knogo Corporation Field strength uniformity control system
US3990065A (en) * 1975-02-20 1976-11-02 The Magnavox Company Theft detection system
US4095214A (en) * 1976-06-17 1978-06-13 Knogo Corporation Electronic monitoring system and responder device
DE2732167A1 (en) * 1976-07-15 1978-01-26 Minnesota Mining & Mfg Marker to prevent theft and methods for manufacturing the marker element
US4075618A (en) * 1976-07-15 1978-02-21 Minnesota Mining And Manufacturing Company Magnetic asymmetric antipilferage marker
US4326198A (en) * 1976-08-18 1982-04-20 Knogo Corporation Method and apparatus for the promotion of selected harmonic response signals in an article detection system
DE2737129A1 (en) * 1976-08-18 1978-02-23 Knogo Corp A method and apparatus for increasing the selective response to harmonic in an object detection system
DE2820166A1 (en) * 1977-05-09 1978-11-23 Knogo Corp Been device for discovering of at a ueberwachungsstelle unjustified moved past
FR2390784A1 (en) * 1977-05-09 1978-12-08 Knogo Corp Device for protecting against theft
US4118693A (en) * 1977-05-09 1978-10-03 Knogo Corporation Method and apparatus for producing uniform electromagnetic fields in an article detection system
DE2823191A1 (en) * 1977-05-24 1978-11-30 Minnesota Mining & Mfg Improved system for anti-theft with achterfoermigen field- and detector coils
FR2392456A1 (en) * 1977-05-24 1978-12-22 Minnesota Mining & Mfg Installing fight against pilferage
US4135184A (en) * 1977-08-31 1979-01-16 Knogo Corporation Electronic theft detection system for monitoring wide passageways
DE2837637A1 (en) * 1977-08-31 1979-03-08 Knogo Corp Electronic theft-assurance system for wider ueberwachung durchgaenge
FR2427697A1 (en) * 1978-02-17 1979-12-28 Lichtblau George Antenna for theft of goods Detection system
FR2491631A1 (en) * 1980-10-02 1982-04-09 Sensormatic Electronics Corp magnetic monitoring device is discrimination of odd-even harmonics and phase discrimination.
US4309697A (en) * 1980-10-02 1982-01-05 Sensormatic Electronics Corporation Magnetic surveillance system with odd-even harmonic and phase discrimination
US4384281A (en) * 1980-10-31 1983-05-17 Knogo Corporation Theft detection apparatus using saturable magnetic targets
FR2512558A1 (en) * 1981-09-10 1983-03-11 Sensormatic Electronics Corp Electrical monitoring device with mobile antenna elements
DE3233028A1 (en) * 1981-09-10 1983-03-24 Sensormatic Electronics Corp Electric monitoring device with movable antenna elements
US4394645A (en) * 1981-09-10 1983-07-19 Sensormatic Electronics Corporation Electrical surveillance apparatus with moveable antenna elements
USRE32627E (en) * 1981-09-10 1988-03-22 Sensormatic Electronics Corporation Electrical surveillance apparatus with moveable antenna elements
EP0078401B1 (en) * 1981-11-02 1985-08-07 Allied Corporation Amorphous antipilferage marker
WO1983002027A1 (en) * 1981-11-24 1983-06-09 Myong Shin Antitheft system
WO1983003203A1 (en) * 1982-03-15 1983-09-29 Progressive Dynamics Method and apparatus for theft detection systems
US4535323A (en) * 1982-03-15 1985-08-13 Progressive Dynamics, Inc. Preamplifying and signal processing method and apparatus for theft detection systems
US4510489A (en) * 1982-04-29 1985-04-09 Allied Corporation Surveillance system having magnetomechanical marker
US4510490A (en) * 1982-04-29 1985-04-09 Allied Corporation Coded surveillance system having magnetomechanical marker
EP0121649A1 (en) * 1983-02-04 1984-10-17 Allied Corporation Amorphous antipilferage marker
US4553136A (en) * 1983-02-04 1985-11-12 Allied Corporation Amorphous antipilferage marker
USRE35042E (en) * 1983-02-04 1995-09-26 Allied Corporation Amorphous antipilferage marker
EP0130286A2 (en) * 1983-06-30 1985-01-09 Knogo Corporation Method and apparatus for detection of targets in an interrogation zone
EP0130286A3 (en) * 1983-06-30 1988-03-02 Knogo Corporation Method and apparatus for detection of targets in an interrogation zone
EP0134404A1 (en) * 1983-07-13 1985-03-20 Knogo Corporation Method and apparatus for target deactivation and reactivation
US4665387A (en) * 1983-07-13 1987-05-12 Knogo Corporation Method and apparatus for target deactivation and reactivation in article surveillance systems
DE3419785A1 (en) * 1983-10-20 1985-05-09 Sigma Security Inc Through security system
DE3505052A1 (en) * 1984-02-16 1985-08-22 Sigma Security Inc Through security system
US4642613A (en) * 1984-03-16 1987-02-10 Knogo Corporation Electronic theft detection apparatus with responder elements on protected articles
US4568921A (en) * 1984-07-13 1986-02-04 Knogo Corporation Theft detection apparatus and target and method of making same
US4697170A (en) * 1985-10-31 1987-09-29 Minnesota Mining And Manufacturing Company Method for minimizing false alarms and electronic noise in electronic article surveillance systems.
US4823113A (en) * 1986-02-27 1989-04-18 Allied-Signal Inc. Glassy alloy identification marker
US4684930A (en) * 1986-03-18 1987-08-04 Knogo Corporation Method and apparatus for deactivating targets used in electromagnetic type article surveillance systems
US4746908A (en) * 1986-09-19 1988-05-24 Minnesota Mining And Manufacturing Company Dual-status, magnetically imagable article surveillance marker
US4710754A (en) * 1986-09-19 1987-12-01 Minnesota Mining And Manufacturing Company Magnetic marker having switching section for use in electronic article surveillance systems
US4779076A (en) * 1987-05-20 1988-10-18 Controlled Information Corp. Deactivatable coded marker and magnetic article surveillance system
FR2619929A1 (en) * 1987-08-28 1989-03-03 Sensormatic Electronics Corp Electronic Monitoring System articles
DE3837129A1 (en) * 1987-11-04 1989-05-18 Sensormatic Electronics Corp Marker for use in an article-ueberwachungsanlage and process for preparing the markers
US4829288A (en) * 1987-11-30 1989-05-09 Minnesota Mining And Manufacturing Company Economic, multi-directionally responsive marker for use in electronic article surveillance systems
US4825197A (en) * 1988-02-01 1989-04-25 Minnesota Mining And Manufacturing Company Dual status magnetic marker having magnetically biasable flux collectors for us in electronic article surveillance systems
US4884063A (en) * 1988-02-01 1989-11-28 Minnesota Mining And Manufacturing Company Dual status magnetic marker having magnetically biasable flux collectors for use in electronic article surveillance systems
US4857891A (en) * 1988-04-29 1989-08-15 Minnesota Mining And Manufacturing Company Random-filament, multi-directionally responsive marker for use in electronic article surveillance systems
EP0352513A3 (en) * 1988-07-29 1990-09-19 Knogo Corporation Load isolated article surveillance system and antenna assembly
US5121103A (en) * 1988-07-29 1992-06-09 Knogo Corporation Load isolated article surveillance system and antenna assembly
EP0352513A2 (en) * 1988-07-29 1990-01-31 Knogo Corporation Load isolated article surveillance system and antenna assembly
DE3942722B4 (en) * 1988-12-27 2005-05-12 Pitney Bowes, Inc., Stamford Ferromagnetic fibers for use in electronic article surveillance and process for producing same
EP0387970A1 (en) * 1989-03-17 1990-09-19 N.V. Nederlandsche Apparatenfabriek NEDAP Shoplifting detection system of the transmission type
US4967185A (en) * 1989-08-08 1990-10-30 Minnesota Mining And Manufacturing Company Multi-directionally responsive, dual-status, magnetic article surveillance marker having continuous keeper
US5146204A (en) * 1990-03-13 1992-09-08 Knogo Corporation Theft detection apparatus and flattened wire target and method of making same
US5288980A (en) * 1992-06-25 1994-02-22 Kingsley Library Equipment Company Library check out/check in system
US5432499A (en) * 1993-05-27 1995-07-11 Minnesota Mining And Manufacturing Company Collector type article surveillance marker with continuous keeper
US5808466A (en) * 1993-08-02 1998-09-15 Azkoyen Industrial, S.A. Process and device for high speed measurement and characterization of magnetic materials
US5405702A (en) * 1993-12-30 1995-04-11 Minnesota Mining And Manufacturing Company Method for manufacturing a thin-film EAS and marker
US5614824A (en) * 1995-05-15 1997-03-25 Crane & Co., Inc. Harmonic-based verifier device for a magnetic security thread having linear and non-linear ferromagnetic characteristics
US5825291A (en) * 1996-04-10 1998-10-20 Sentry Technology Corporation Electronic article surveillance system
EP0848355A1 (en) 1996-12-12 1998-06-17 N.V. Bekaert S.A. Method and apparatus for detecting the presence of particles in a substrate
EP0848356A1 (en) 1996-12-12 1998-06-17 Arjo Wiggins S.A. Substrate comprising magnetic particles, security document and method for detecting them
US5992741A (en) * 1996-12-12 1999-11-30 Robertson; Paul Andrew Magnetic detection of security articles
US6598793B1 (en) 1996-12-12 2003-07-29 N.V. Bekaert S.A. Article recognition and verification
EP1715466A2 (en) 2005-04-21 2006-10-25 Micromag 2000, S.L. A magnetic tag that can be activated/deactivated based on magnetic microwire and a method for obtaining the same
US7852215B2 (en) 2005-04-21 2010-12-14 Micromag 2000, S.L. Magnetic tag that can be activated/deactivated based on magnetic microwire and a method for obtaining the same
EP1933286A2 (en) 2006-12-15 2008-06-18 Micromag 2000, S.L. Magnetoacustic markers based on magnetic microwire, and method of obtaining the same

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