WO1999053458A1 - Marqueur magnetique desactivable et procede de fabrication correspondant - Google Patents

Marqueur magnetique desactivable et procede de fabrication correspondant Download PDF

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Publication number
WO1999053458A1
WO1999053458A1 PCT/CA1999/000296 CA9900296W WO9953458A1 WO 1999053458 A1 WO1999053458 A1 WO 1999053458A1 CA 9900296 W CA9900296 W CA 9900296W WO 9953458 A1 WO9953458 A1 WO 9953458A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
marker
magnetic
deactivating
fibers
Prior art date
Application number
PCT/CA1999/000296
Other languages
English (en)
Inventor
Piotr Rudkowski
John Strom-Olsen
Zhi Hui Liu
Original Assignee
Mxt Inc.
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 by Mxt Inc. filed Critical Mxt Inc.
Priority to AU31340/99A priority Critical patent/AU3134099A/en
Publication of WO1999053458A1 publication Critical patent/WO1999053458A1/fr

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
    • G08B13/2411—Tag deactivation
    • 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
    • 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
    • G08B13/2442—Tag materials and material properties thereof, e.g. magnetic material 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/14—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates
    • H01F41/24—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates from liquids

Definitions

  • This invention relates to a deactivatable magnetic marker, a process for producing the deactivatable magnetic marker and use of the deactivatable magnetic marker in an electronic surveillance system.
  • Electronic monitoring systems which electronically monitor the removal or passage of goods from a protected area, such as a site of purchase of the goods as in a store or a site of use of the goods as in a reference library.
  • Exit from the protected area involves passage through an interrogation zone which detects the presence of a marker on the goods if the goods are being improperly removed from the protected area.
  • the marker comprises a magnetic material; a continuous alternating magnetic interrogation field is generated in the interrogation zone; when the magnetic material of the marker is exposed to this magnetic interrogation field it is driven into and out of magnetic saturation producing a characteristic detectable disturbance of the interrogation field, which in turn generates an audible or visual alarm signal.
  • a deactivating element accompanies the marker which is able to deactivate the marker for legitimate or authorized removal of the goods from the protected site, such as when the goods have been purchased in a store housing the protected site.
  • the deactivating element is a magnetizable material which, when magnetized, produces a magnetic field which generates magnetic saturation in the marker to a degree that the magnetic interrogation field does not drive the marker into and out of saturation so that no characteristic detectable disturbance of the interrogation field is developed.
  • Electrodeposition requires constant electrical contact of the magnetic strip with electrodes. Vacuum deposition and sputtering require unobstructed access to the strip surface to be coated.
  • This invention seeks to provide an improved deactivatable marker.
  • the invention also seeks to provide a method for producing the improved deactivatable marker.
  • a deactivatable magnetic marker comprising: i) a deactivatable magnetic substrate adapted to provide a desired magnetic signal, and ii) a layer deposited on said substrate selected from: a) an electrolessly deposited deactivating layer, and b) a composite layer comprising an electrolessly deposited intermediate layer on said substrate and a deactivating layer on said intermediate layer, said deactivating layer being of magnetizable material of higher magnetic coercivity than said magnetic substrate such that, as magnetized, said deactivating layer deactivates said magnetic substrate.
  • a process for producing a deactivatable magnetic marker comprising: i) electrolessly depositing on a deactivatable magnetic substrate, a layer selected from: a) a deactivating layer, and b) an intermediate layer, and ii) when said layer is said intermediate layer b), depositing a deactivating layer on said intermediate layer, said magnetic substrate being adapted to provide a desired magnetic signal, and said deactivating layer being of magnetizable material of higher coercivity than said magnetic substrate such that, as magnetized, said deactivating layer deactivates said magnetic substrate.
  • the electroless deposition may be electroless-plating or immersion plating.
  • the magnetic substrate of the deactivatable marker is more especially of a soft magnetic material, which is more especially in the form of a fiber or a web of fibers.
  • the fiber or the fibers of the web have a diameter of 5 to 100 ⁇ m, more usually 15 to 40 ⁇ m.
  • the fibers are amorphous and are made by a melt extraction process.
  • Soft magnetic materials are characterized by high permeability and low coercivity. Typical soft magnetic materials are permalloys, amorphous nickel-iron alloys and amorphous iron-cobalt alloys. - 4 -
  • Soft magnetic material employed in the marker of the invention suitably has a coercivity below 1 Oe and in particular will have a magnetic remanence near zero, and typically within 1% of the saturated magnetization.
  • An electrolessly deposited layer is formed on the magnetic substrate either as the deactivating layer itself or as an intermediate or buffer layer between the magnetic substrate and a subsequently deposited deactivating layer of magnetizable material.
  • the deactivating layer is electrolessly deposited directly on the magnetic substrate.
  • an intermediate or buffer layer is deposited on the magnetic substrate and the deactivating layer is deposited on the intermediate or buffer layer.
  • the deactivating layer may be deposited electrolessly or by other techniques such as electrodeposition, for example, by electroplating or sputtering.
  • the intermediate or buffer layer serves a protective function, preventing and reducing deterioration of the physical or magnetic characteristics of the magnetic substrate, which deterioration is experienced when the deactivating layer is deposited directly on the magnetic substrate by electrodeposition.
  • the electrolessly-deposited intermediate or buffer layer may be a non-magnetic or a soft magnetic layer.
  • Particularly suitable nonmagnetic or soft magnetic layers are Ni-P alloys and Cu-P alloys.
  • Such active surfaces can result, for example, from the treatment of the substrate with stannous and palladium containing solutions.
  • stannous and palladium activation it should be understood that any material that can be deposited on the surface in atomic or very small quantities so as to render the surface autocatalytic can be employed to achieve the same result.
  • Electroless deposition in the present invention contemplates electroless plating or immersion plating. Electroless plating is the controlled autocatalytic deposition of a continuous film or coating by - 5 -
  • the electroless-plating bath provides a deposit that follows the contours of the substrate exactly, without build-up at edges and corners.
  • Electroless plating employs a solution which contains the ions of the metal to be plated together with a reducing agent which, in the presence of a suitable catalyst, reduces the ions to metal.
  • the catalyst is typically a metal surface, which may be of the same metal as that to be plated.
  • cobalt alloys are themselves catalytic and do not require a catalytic layer. In the case of amorphous fibers, however, an additional layer or surface treatment is required to prevent degradation and to render the surface suitably catalytic.
  • metal ions are reduced to metal by the action of chemical reducing agents, which are simply electron donors.
  • the metal ions are electron acceptors, which react with electron donors.
  • the catalyst is the workpiece or metallic surface, which accelerates the electroless chemical reaction allowing oxidation of the reducing agent.
  • Immersion plating takes place when the surface to be plated is partially dissolved by the plating bath; for instance, when metal A is immersed in a solution containing ions of metal B, under certain conditions a small quantity of metal A is dissolved from the surface and replaced by an electrochemically equivalent quantity of metal B.
  • Immersion baths can only be used for specific combinations of base and plated metals, while true electroless baths for electroless-plating work on any catalytic surface, except on certain metals which inhibit the reaction. Furthermore, immersion plating produces only a thin coating usually about 1 to 2 microns, since the displacement reaction is gradually inhibited by deposited metal. True electroless baths may deposit much heavier coatings virtually unlimited in thickness, since the reducing agent is contained in the solution.
  • the intermediate layer applied as a separate electroless layer, has a thickness of 0.2 to 10 ⁇ m, more usually 0.5 to 6 ⁇ m. - 6
  • the electroless process forms the deactivation layer then its thickness has to be such as to suitably perform the required deactivation process
  • the magnetic substrate in the form of a fiber or a web of fibers may be incorporated in a plastic support, for example, a sheet or strip of a non-woven plastic material such as polyester.
  • the fiber or web is incorporated in the support so as to be partially or totally exposed at a surface of the support (and within the support should the support be porous), an activating layer for the electroless deposition and the subsequent electrolessly deposited layer are disposed on the exposed portions of the fiber or web and support.
  • the procedure may involve incorporation in the plastic support, sensitizing the plastic and electroless deposition of the intermediate layer followed by deposition of the deactivating layer.
  • certain areas of the fiber or web may also be covered by an inert coating layer so as to prevent deposition of the intermediate and/or deactivation layers in these areas.
  • the fiber or web will be only partly covered with the deactivating layer, so that the deactivating layer is deposited in a non-continuous layer, in a desired pattern.
  • This will allow for magnetic flux pinning. This procedure is easily applied when the fibers are contained in a sheet or thread like support, which can be selectively covered with liquid monomers or plastics, which are subsequently cured, or with lacquers, varnishes or resists that restrict the access of the electroless plating solutions to the selected portions of the fibers in the support.
  • Suitable deactivating layers are based on Co, Fe or Ni alloys, for example, semi-hard Co-P alloys, semi-hard Fe-P alloys and semi-hard alloys containing at least 99%, by weight Ni. - 7 -
  • the magnetizable material forms a semi-hard magnet having coercivity between 10 Oe and 300 Oe, preferably between 30 Oe and l50 Oe.
  • the deactivating layer suitably has a thickness of 5 to 35 ⁇ m.
  • the deactivatable marker fibers may be employed directly as markers by direct incorporation in a product such as a garment, or they may be incorporated in a body member of a product label or tag which is to be attached to the product.
  • the body member may be of paper, plastic or textile material.
  • the deactivatable marker fibers may also be formed directly in a body member.
  • the soft magnetic fibers may be incorporated in a dielectric substrate, for example, a plastic substrate, such that the dielectric substrate provides the protective coating.
  • the marker fibers may be incorporated in packaging for a product.
  • electroless deposition is characterized by complete coverage of the surface on which the deposition takes place.
  • Complete coverage of the soft magnetic element as exemplified by a fiber of defined length, would imply that the demagnetizing field, generated upon magnetization of the magnetically semi-hard deactivation layer, would not penetrate the inner soft magnetic material of the magnetic substrate, and thus not cause the desired magnetic saturation.
  • the fact that such layers do indeed show the desired deactivation effect is not fully understood, but could be due to the lack of uniformity of the deposit, particularly when relatively thick layers are electrolessly deposited.
  • Non-uniform layers would demonstrate the desired deactivation effect as taught by Petersen in US Patent 3,747,086. This magnetic non-uniformity could be caused by the physical form of the deposit, local compositional changes or a combination of both of these factors.
  • Non-ionic wetting agent 7 drops The fibers were rinsed with deionised water, and activated by immersing in an acidic solution containing ions of palladium for about two minutes:
  • the activated fibers were rinsed with deionised water and introduced into an electroless copper plating bath to form the intermediate layer:
  • the bath was operated at 25°C; at pH 12 controlled by addition of sodium hydroxide for a time of about 15 minutes, the resulting fibers were rinsed with deionised water and dried. - 9 -
  • the fibers were rinsed with deionised water and introduced into an electroless nickel plating solution to form the intermediate layer: Nickel chloride 45 g/1
  • the bath was operated at pH 8.5 to 9.0 and a temperature of 90 to 100°C for a time of 30 minutes (the bath had a plating rate of 7.5 micrometers per hour); the resulting fibers were rinsed with deionised water and dried.
  • Example illustrates electro-plating of semi-hard magnetic material on melt extracted fibers, which have been previously coated with an electroless nickel or copper intermediate layer.
  • Plating was performed at room temperature (25°C), and a current was passed through the fibers for an amount of time sufficient to coat the fibers with a layer of 20 microns of iron.
  • the electroplated fibers were rinsed in 99% pure alcohol and dried. - 10
  • Electroless plated nickel or copper fibers produced as in Example 1 were degreased in 99% pure alcohol and dried. The fibers were connected with a negative electrode and electroplated with a semi-hard nickel-cobalt layer using the following bath and conditions: Nickel chloride 110 g/1
  • Non-ionic wetting agent 7 drops The fibers were rinsed with deionised water, and activated by immersing in an acidic solution containing ions of palladium: Palladium chloride 0.3 g/1
  • Non-ionic wetting agent 7 drops 11
  • the activated fibers were then thoroughly rinsed in deionized water and then immersed in a electroless cobalt alloy plating solution:
  • the activated fibers were then thoroughly rinsed in deionized water and then immersed in an electroless cobalt alloy plating solution:
  • the solution was maintained at a pH of 8.5, by additions of ammonium hydroxide, and at a temperature of 90°C, and plating was continued for three hours to provide an alloy coating of approximately 20 microns on the fibers.
  • the resulting fibers were rinsed with deionised water and dried.
  • a sample of porous, non-woven polyester sheet having a thickness of approximately 125 microns and containing 5 grams of melt extracted fiber per square meter of area was degreased in 99% pure alcohol and rinsed.
  • the contained, melt extracted fibers were sensitized by immersion in an acidic solution containing stannous ions for 120 seconds: Stannous chloride, dihydrate 30 g/1
  • Non-ionic wetting agent 7 drops
  • the sample was rinsed with deionised water, and activated by immersing in an acidic solution containing ions of palladium: Palladium chloride 0.3 g/1
  • Non-ionic wetting agent 7 drops
  • Example 4 The sample containing the activated fibers was then carefully rinsed in deionized water and coated with an electroless cobalt alloy as in Example 4.
  • the resulting sheet containing the coated fibers was then rinsed with deionised water and dried.
  • a sample of porous, non-woven polyester sheet having a thickness of approximately 125 microns and containing 5 grams of melt extracted fiber per square meter of area was degreased in 99% pure alcohol and rinsed.
  • the fibers, contained therein, were made electro-catalytically active by immersion in a solution comprising:
  • the sample containing the activated fibers was then thoroughly rinsed in deionized water and then thoroughly rinsed in deionized water and coated with an electroless cobalt alloy as in Example 4.
  • the resulting sheet containing the coated fibers was then rinsed with deionised water and dried.
  • Fibers coated as per Example 3 had the following properties:
  • markers could not been detected after they had be subjected to a suitable, demagnetizing field.
  • Fibers coated as per Example 4 had the following properties:
  • Sample markers made from these fibers were readily detected in commercial anti-theft gates, (operating on the electro-magnetic principle), before being subjected to a deactivating field, and the same markers could not be detected after they had be subjected to a suitable, demagnetizing field.
  • Markers fabricated from a non-woven polymeric sheet treated as described in Examples 5 and 6 were readily detected in commercial anti- theft gates, (operating on the electro-magnetic principle), before being subjected to a deactivating field, and the same markers could not been detected after they had be subjected to a suitable, demagnetizing field.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Security & Cryptography (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemically Coating (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Abstract

L'invention a pour objet un marqueur désactivable, du type de ceux utilisés pour l'identification ou l'authentification de sécurité de produits. Il comprend un substrat magnétique désactivable, normalement en matériau magnétique mou, une couche protectrice appliquée par dépôt autocatalytique et une couche de désactivation faite normalement à partir d'un matériau magnétique semi-dur. La couche de désactivation peut également être appliquée par dépôt autocatalytique, après le dépôt de la couche protectrice; elle peut être constituée du même matériau que la couche de protection. Le dépôt autocatalytique permet d'appliquer le processus de désactivation à de nombreuses fibres fines se présentant comme un assemblage de fibres séparées ou comme un réseau de fibres déposées sur une bande non conductrice. On peut ensuite utiliser cette dernière pour fabriquer des marqueurs désactivables ayant les formes les plus variées.
PCT/CA1999/000296 1998-04-15 1999-04-07 Marqueur magnetique desactivable et procede de fabrication correspondant WO1999053458A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU31340/99A AU3134099A (en) 1998-04-15 1999-04-07 Deactivatable magnetic marker and method for production thereof

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA2,234,760 1998-04-15
CA 2234760 CA2234760A1 (fr) 1998-04-15 1998-04-15 Marqueur magnetique pouvant etre desactive et methode de fabrication de celui-ci

Publications (1)

Publication Number Publication Date
WO1999053458A1 true WO1999053458A1 (fr) 1999-10-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1999/000296 WO1999053458A1 (fr) 1998-04-15 1999-04-07 Marqueur magnetique desactivable et procede de fabrication correspondant

Country Status (3)

Country Link
AU (1) AU3134099A (fr)
CA (1) CA2234760A1 (fr)
WO (1) WO1999053458A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001053575A1 (fr) * 2000-01-21 2001-07-26 Mxt Inc. Fil textile contenant des fibres magnetiques destine a etre utilise en tant que marqueur magnetique
WO2001078030A1 (fr) * 2000-04-07 2001-10-18 Rso Corporation N.V. Marque destinee a la teledetection d'articles
WO2004031444A2 (fr) * 2002-10-04 2004-04-15 Qinetiq Limited Procede de fabrication d'une etiquette magnetique
WO2008020148A2 (fr) * 2006-08-17 2008-02-21 Maganetix Ltd Marqueur magnétique désactivable à double fonction et son procédé de désactivation
US7469838B2 (en) 2001-12-10 2008-12-30 Brewster Kaleidoscope Llc Detectable components and detection apparatus for detecting such components
WO2010033064A1 (fr) * 2008-09-22 2010-03-25 Sarci Ag Procédé et dispositif permettant une identification des articles

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3895124A (en) * 1971-12-22 1975-07-15 Ici Ltd Process for controlling the coercivity of a cobalt or cobalt/nickel coating applied by an electroless plating process
US4224381A (en) * 1978-10-19 1980-09-23 Poly Disc Systems, Inc. Abrasion resistant magnetic record members
US5003291A (en) * 1988-12-27 1991-03-26 Strom Olsen John O Ferromagnetic fibers having use in electronical article surveillance and method of making same
US5006367A (en) * 1988-09-26 1991-04-09 Surface Technology, Inc. Electroless coating method
US5121106A (en) * 1990-12-31 1992-06-09 Pitney Bowes Inc. Electronic article surveillance markers with diagonal deactivation elements
EP0643376A1 (fr) * 1993-09-10 1995-03-15 Knogo Corporation Marqueur de surveillance et procédé pour sa production
EP0820938A1 (fr) * 1996-07-26 1998-01-28 Knauf SNC Emballage antivol et procédés de fabrication d'un tel emballage

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3895124A (en) * 1971-12-22 1975-07-15 Ici Ltd Process for controlling the coercivity of a cobalt or cobalt/nickel coating applied by an electroless plating process
US4224381A (en) * 1978-10-19 1980-09-23 Poly Disc Systems, Inc. Abrasion resistant magnetic record members
US5006367A (en) * 1988-09-26 1991-04-09 Surface Technology, Inc. Electroless coating method
US5003291A (en) * 1988-12-27 1991-03-26 Strom Olsen John O Ferromagnetic fibers having use in electronical article surveillance and method of making same
US5121106A (en) * 1990-12-31 1992-06-09 Pitney Bowes Inc. Electronic article surveillance markers with diagonal deactivation elements
EP0643376A1 (fr) * 1993-09-10 1995-03-15 Knogo Corporation Marqueur de surveillance et procédé pour sa production
EP0820938A1 (fr) * 1996-07-26 1998-01-28 Knauf SNC Emballage antivol et procédés de fabrication d'un tel emballage

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001053575A1 (fr) * 2000-01-21 2001-07-26 Mxt Inc. Fil textile contenant des fibres magnetiques destine a etre utilise en tant que marqueur magnetique
WO2001078030A1 (fr) * 2000-04-07 2001-10-18 Rso Corporation N.V. Marque destinee a la teledetection d'articles
US7469838B2 (en) 2001-12-10 2008-12-30 Brewster Kaleidoscope Llc Detectable components and detection apparatus for detecting such components
WO2004031444A2 (fr) * 2002-10-04 2004-04-15 Qinetiq Limited Procede de fabrication d'une etiquette magnetique
GB2394725A (en) * 2002-10-04 2004-05-05 Qinetiq Ltd Method of forming a magnetic information tag by electroless deposition
WO2004031444A3 (fr) * 2002-10-04 2004-11-25 Qinetiq Ltd Procede de fabrication d'une etiquette magnetique
WO2008020148A2 (fr) * 2006-08-17 2008-02-21 Maganetix Ltd Marqueur magnétique désactivable à double fonction et son procédé de désactivation
WO2008020148A3 (fr) * 2006-08-17 2008-05-02 Maganetix Ltd Marqueur magnétique désactivable à double fonction et son procédé de désactivation
WO2010033064A1 (fr) * 2008-09-22 2010-03-25 Sarci Ag Procédé et dispositif permettant une identification des articles
US8669847B2 (en) 2008-09-22 2014-03-11 Carl Tyrén Method and device for identifying a tag based on the orientation of fibers

Also Published As

Publication number Publication date
CA2234760A1 (fr) 1999-10-15
AU3134099A (en) 1999-11-01

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