FR763681A - Method of locating objects by modifying a magnetic field - Google Patents

Method of locating 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
France
Prior art keywords
modifying
magnetic field
locating objects
locating
objects
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
Application filed filed Critical
Application granted granted Critical
Publication of FR763681A publication Critical patent/FR763681A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic 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
    • G08B13/2405—Electronic 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
    • G08B13/2408—Electronic 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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic 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
    • G08B13/2428—Tag details
    • G08B13/2431—Tag circuit details
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic 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
    • G08B13/2428—Tag details
    • G08B13/2437—Tag layered structure, processes for making layered tags
    • G08B13/2445—Tag integrated into item to be protected, e.g. source tagging
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic 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
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468—Antenna in system and the related signal processing
    • G08B13/2471—Antenna signal processing by receiver or emitter
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402—Electronic 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
    • G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
    • G08B13/2468—Antenna in system and the related signal processing
    • G08B13/2474—Antenna or antenna activator geometry, arrangement or layout

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
FR763681D 1933-11-10 1933-11-10 Method of locating objects by modifying a magnetic field Expired FR763681A (en)

Applications Claiming Priority (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
FR763681D Expired FR763681A (en) 1933-11-10 1933-11-10 Method of locating objects by modifying a magnetic field

Country Status (1)

Country Link
FR (1) FR763681A (en)

Cited By (69)

* 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 Method and device for determining the condition and identity of objects
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 FOR THE PREVENTION OF THEFT AND METHOD FOR MANUFACTURING THE MARKER
US4074249A (en) 1977-02-04 1978-02-14 Knogo Corporation Magnetic detection means
DE2737129A1 (en) * 1976-08-18 1978-02-23 Knogo Corp METHOD AND DEVICE FOR INCREASING THE SELECTIVE RESPONSE TO HARMONICS IN AN OBJECT DETECTOR 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 THEFT PROTECTION WITH EIGHT-SHAPED 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 GOODS THEFT DETECTION INSTALLATION
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 APPARATUS 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 And Manufacturing Co., Saint Paul, Minn. Marking element for use in a device for detecting an object in an interrogation zone
EP0134404A1 (en) * 1983-07-13 1985-03-20 Knogo Corporation Method and apparatus for target deactivation and reactivation
US4510490A (en) * 1982-04-29 1985-04-09 Allied Corporation Coded surveillance system having magnetomechanical marker
US4510489A (en) * 1982-04-29 1985-04-09 Allied Corporation Surveillance system having magnetomechanical marker
DE3419785A1 (en) * 1983-10-20 1985-05-09 Sigma Security Inc., Toronto, Ontario PEDESTAL 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., Toronto, Ontario PEDESTAL 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 ARTICLE MONITORING SYSTEM
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 MONITORING SYSTEM AND METHOD FOR MANUFACTURING THE MARKER
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 method of making the 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
US11023795B2 (en) 2016-04-13 2021-06-01 Universidad Complutense De Madrid Tag system and method for long-distance detection of objects

Cited By (85)

* 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
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
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
DE2066151C2 (en) * 1969-07-11 1985-02-28 Minnesota Mining And Manufacturing Co., Saint Paul, Minn. Marking element for use in a device for detecting an object in an interrogation zone
DE2035356A1 (en) * 1969-07-11 1971-02-04 Minnesota Mining & Mfg Method and device for determining the condition and identity of objects
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 FOR THE PREVENTION OF THEFT AND METHOD FOR MANUFACTURING THE MARKER
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 METHOD AND DEVICE FOR INCREASING THE SELECTIVE RESPONSE TO HARMONICS IN AN OBJECT DETECTOR SYSTEM
US4074249A (en) 1977-02-04 1978-02-14 Knogo Corporation Magnetic detection means
DE2820166A1 (en) * 1977-05-09 1978-11-23 Knogo Corp DEVICE FOR DETECTING GOODS PASSED BY UNAUTHORIZED AT A SURVEILLANCE POINT
FR2390784A1 (en) * 1977-05-09 1978-12-08 Knogo Corp THEFT PROTECTION 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 THEFT PROTECTION WITH EIGHT-SHAPED FIELD AND DETECTOR COILS
FR2392456A1 (en) * 1977-05-24 1978-12-22 Minnesota Mining & Mfg ANTI-CHAPARDING INSTALLATION
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 ANTI-THEFT SECURITY SYSTEM FOR MONITORING WIDE PASSAGE
FR2427697A1 (en) * 1978-02-17 1979-12-28 Lichtblau George ANTENNA FOR GOODS THEFT DETECTION INSTALLATION
US4309697A (en) * 1980-10-02 1982-01-05 Sensormatic Electronics Corporation Magnetic surveillance system with odd-even harmonic and phase discrimination
FR2491631A1 (en) * 1980-10-02 1982-04-09 Sensormatic Electronics Corp MAGNETIC SURVEILLANCE APPARATUS WITH DISCRIMINATION OF IMPAIRS-PAIRS HARMONICS AND DISCRIMINATION OF PHASES.
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 APPARATUS WITH MOBILE ANTENNA ELEMENTS
DE3233028A1 (en) * 1981-09-10 1983-03-24 Sensormatic Electronics Corp., 33441 Deerfield Beach, Fla. ELECTRICAL 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
US4535323A (en) * 1982-03-15 1985-08-13 Progressive Dynamics, Inc. Preamplifying and signal processing method and apparatus for theft detection systems
WO1983003203A1 (en) * 1982-03-15 1983-09-29 Progressive Dynamics Method and apparatus for theft detection systems
US4510490A (en) * 1982-04-29 1985-04-09 Allied Corporation Coded surveillance system having magnetomechanical marker
US4510489A (en) * 1982-04-29 1985-04-09 Allied Corporation Surveillance system having magnetomechanical 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
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
US4623877A (en) 1983-06-30 1986-11-18 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
US4665387A (en) * 1983-07-13 1987-05-12 Knogo Corporation Method and apparatus for target deactivation and reactivation in article surveillance systems
EP0134404A1 (en) * 1983-07-13 1985-03-20 Knogo Corporation Method and apparatus for target deactivation and reactivation
DE3419785A1 (en) * 1983-10-20 1985-05-09 Sigma Security Inc., Toronto, Ontario PEDESTAL SECURITY SYSTEM
DE3505052A1 (en) * 1984-02-16 1985-08-22 Sigma Security Inc., Toronto, Ontario PEDESTAL 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 ARTICLE MONITORING SYSTEM
DE3837129A1 (en) * 1987-11-04 1989-05-18 Sensormatic Electronics Corp MARKER FOR USE IN AN ARTICLE MONITORING SYSTEM AND METHOD FOR MANUFACTURING THE MARKER
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 method of making the 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
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
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
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
US11023795B2 (en) 2016-04-13 2021-06-01 Universidad Complutense De Madrid Tag system and method for long-distance detection of objects

Similar Documents

Publication Publication Date Title
FR763681A (en) Method of locating objects by modifying a magnetic field
FR790386A (en) New method of using electromagnetic waves
FR865869A (en) Process for impregnating textiles and materials obtained by this process
FR886820A (en) Method of improving metal objects
FR798171A (en) Improvements in methods of locating moving objects in a wave field
FR812366A (en) Process for preparing acetone cyanohydrin
FR798674A (en) Distributor of objects controlled by a coin
CH233875A (en) A method of manufacturing a toy plane and a toy plane obtained by this process.
FR837280A (en) Process for the precipitation of a ferrous salt with an appropriate ferricyanide
FR773331A (en) Refinements to inductance coils
FR797098A (en) Treatment process for metal objects
FR778685A (en) Locating a mobile by sound
FR774471A (en) Enamelling process for iron objects
FR800833A (en) Self-induction coil calibration process
FR869771A (en) Stamping process of pistons for engines
FR45780E (en) New method of using electromagnetic waves
FR828761A (en) Recovery process for submerged objects
FR812471A (en) Metalworking process
FR878231A (en) Method of establishing rigged stereoscopic images
FR845188A (en) Induction coil
FR807059A (en) Continuous wave emission process
FR849085A (en) Ring magnet magnetization process
FR874491A (en) Seismic shock recording process
FR869761A (en) Ignition coil
FR849087A (en) Method of determining a position