EP1292932B1 - Dispositif de detection de papier marque et papier marque detectable par le dispositif - Google Patents

Dispositif de detection de papier marque et papier marque detectable par le dispositif Download PDF

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Publication number
EP1292932B1
EP1292932B1 EP01947524A EP01947524A EP1292932B1 EP 1292932 B1 EP1292932 B1 EP 1292932B1 EP 01947524 A EP01947524 A EP 01947524A EP 01947524 A EP01947524 A EP 01947524A EP 1292932 B1 EP1292932 B1 EP 1292932B1
Authority
EP
European Patent Office
Prior art keywords
paper
filaments
magnetic
marked paper
document
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 - Lifetime
Application number
EP01947524A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1292932A1 (fr
Inventor
Olivier Acher
Marc Ledieu
Jean-Claude Joubert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
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
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Publication of EP1292932A1 publication Critical patent/EP1292932A1/fr
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Publication of EP1292932B1 publication Critical patent/EP1292932B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G08B13/2437—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
    • G08B13/2474—Antenna or antenna activator geometry, arrangement or layout
    • 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
    • G08B13/2482—EAS methods, e.g. description of flow chart of the detection procedure

Definitions

  • the present invention relates to a document marked paper and the process of document manufacturing of marked paper associated.
  • Another risk of disclosure of information is the negligence of the staff who can use the means of reproduction available in his environment (photocopiers, scanners-, fax, etc.) to reproduce non confidential documents listed in the records kept by the company, and on which there is, in fact, no control.
  • an anti-photocopy paper is a paper containing either diffraction patterns (see US Patent 5,830,609), either luminescent pigments (see patent U.S. 5,271,645).
  • the anti-photocopy paper characteristic of preventing photocopying of documents at using photocopiers or type scanners standard. It has the disadvantage of not allow reproduction even in a context of control.
  • EAS systems EAS for Electronic Article Surveillance
  • EAS systems are mainly intended to prevent theft of goods in the shops or books in the libraries (see US Patents 4,075,618 and U.S. 3,665,449).
  • European Patent Application EP 0 295 028 discloses a magnetic article comprising a sheet of paper on which is placed a polymer substrate coated with amorphous ferromagnetic filaments sheathed of glass.
  • US Patent 5,717,381 discloses a system of copyright protection by element detection magnetic on documents and photos.
  • the invention does not have the disadvantages mentioned above.
  • the paper document marked according to the invention is preferentially in the form of a sheet of paper.
  • a device for detecting paper document marked according to the invention authorizes the reproduction of documents by means of standard photocopies.
  • the possibility left to the user to photocopy - subject to conditions - the documents using standard photocopying facilities very advantageously distinguishes the invention of the art previous mentioned above. Indeed, it is Frequently useful, for reasons of service, not to photocopy all or part of a document extract extracts, transparencies for rear projection, etc.
  • the means allow reproduction of the marked paper document according to the invention can then be managed in result.
  • the number of reproductions of the document can be strictly controlled. So he is possible to keep track of the number of photocopies performed. More generally, an effective policy classification and reproduction of Classified documents can be put in place.
  • a document reproduction system allows the organization of the company to put in place procedures for reproduction and traceability of classified documents that are effective in extent that the reproduction of classified documents does not can not be done by evading procedures.
  • a document detection device of marked paper according to the invention is significantly different from the EAS type anti-theft systems mentioned above. Indeed, a system of detection of paper document marked according to the invention opposes on all the points listed above to anti-theft systems EAS type. For example, according to the invention, it is necessary to detect quantities of matter magnetic much smaller than the quantities of magnetic matter usually detected for make an EAS type marker.
  • the invention also makes it possible to authenticate the originality of certain documents such as official documents, and to distinguish them from documents falsified or reproduced by photocopying, even with sophisticated means.
  • the paper marking process according to the invention has the advantage of ensuring a distribution of the marker over the entire surface of the document and to be almost invisible. Otherwise, the marking remains advantageously present throughout of the document's life, even if, for example, the latter is crumpled.
  • the secure paper according to the invention can also produce, by cutting, labels of various forms intended to be affixed to objects for authentication purposes.
  • Detection of soft magnetic inclusions marked paper is done using the nonlinear characteristic of the field response applied - magnetization (magnetic hysteresis cycle). This non-linearity can be exploited through the harmonic generation of the response to an excitation sinusoidal, or through the detection of jumps said to Barkhausen characterizing the abrupt shift of the magnetization.
  • Magnetic excitation must essentially allow at least 1 ⁇ 2 cycle of hysteresis magnetic. So you have to generate a field going from one saturated state to the opposite one.
  • Information processing can be realized thanks to a circuit using electronics analog. We then use filters that extract the useful signal from the signals captured by the detection system. An electronics digital technology can also be used to signals. Spectral processing (transformation of Fourier) allows you to extract the harmonics interesting.
  • Figures 1 and 3 show two examples excitation configuration of the magnetic material soft placed in the marked paper.
  • Figure 2 represents the variation over time of the excitation magnetic, at a marked point of the paper, which corresponds to the configuration of Figure 1 and the Figure 4 represents the variation over time of the magnetic excitation, at a point of the marked paper, which corresponds to the configuration of Figure 3.
  • FIG. a set of three permanent magnets in the form three magnetic bars A1, A2, A3 section rectangular mounted in opposition.
  • the axis defined by the north and south poles of each of the bars is substantially perpendicular to the plane of the sheet of marked paper (not shown in the figure).
  • the section of the magnetized bars is substantially rectangular.
  • the three bars magnets A1, A2, A3 are mounted on a cylinder head Magnetic CM that allows the field lines to close in order to limit their extension in useful areas.
  • the width L of the bars according to the direction perpendicular to the axis defined by the poles is substantially equal to the width of a sheet of marked paper.
  • the configuration of Figure 3 includes a magnet permanent in the form of a magnetic bar A4 of substantially rectangular section.
  • the axis defined by the north and south poles of the A4 bar is substantially parallel to the plane of the marked piece of paper.
  • the bar A4 is mounted on a magnetic cylinder head CM.
  • the width L of the bars is also substantially equal to the width of a marked sheet of paper.
  • A4 bar participates in magnetic excitation.
  • Several bars may also participate in magnetic excitation.
  • the bars are then placed parallel to each other on the CM cylinder head.
  • the north poles of the different bars are then all positioned on the same first side and the south poles on the same second side opposite to the first side.
  • permanent magnets can be arranged in different ways. We will have to to focus on creating over time, for a zone of scanned document, variable magnetic excitation to tilt the magnetization of soft magnetic inclusions of the marked paper. At this end, the magnetized bars are moved according to a direction parallel to the document plane (direction AA ' in Figures 1 and 3).
  • the maximum value Hmax of the magnetic field H produced when moving the magnetic bars must be very greater than the value of the field of anisotropy of the magnetic materials put into play and also low enough not to disturb the nominal operation of the reproduction device original (photocopiers magnetic toner, spectrum of the neon-type lamp scanners, ).
  • the magnetic cylinder head CM allows, for this purpose, to close the field lines and to prevent their extension into non-useful areas.
  • the configuration shown in Figure 1 creates alternatively positive and negative excitation (see Figure 2).
  • the configuration shown in figure 3 creates a gradient of the magnetic field: the principle in this case, based on the finding that the Magnetic inclusions present in the paper are isotropically dispersed and their condition magnetization is arbitrary at a given moment. The positioning of magnets of different orientations perpendicular to the scanning direction prevents hacking too easy device.
  • Figure 5 shows a coil configuration excitation.
  • Figure 6 shows a refinement of the configuration represented in figure 5.
  • An excitement coil Be traversed by a alternating excitation current ie can generate a Magnetic field of sinusoidal amplitude.
  • Frequency excitation current ie allows the excitation of magnetic inclusions.
  • the frequency of the excitation current can be equal to 1 kHz. Excitation frequencies too low (for example around 50Hz) are preferentially discarded in order to avoid pollution by power supplies and their harmonics.
  • the amplitude of the excitation current is adjusted to allow saturation of the material at each period, with, preferentially, a margin of security corresponding to a static magnetic field disruptive exterior.
  • Bd detection coils also concerns well the case where magnetic excitation is performed at using excitation coils (see Figures 5 and 6) that the case where the magnetic excitation is carried out by permanent magnets (see Figures 1 and 3).
  • Permanent magnets are moved next to the marked paper document that remains fixed.
  • the detection coils can move in solidarity permanent magnets to be fixed. In this last case, it is then possible, for example, to use a or several fixed coils that embrace a single blow the entire reproductive surface of the reproductive apparatus. We can then wind the or the sensing coils around the middle pane of reproduction.
  • a coil of compensation Bc then allows to eliminate the component of signal related to the variation of magnetic field generated by the excitation means (see Figure 6).
  • FIG. 7 shows an application of paper detection device marked according to the invention to a document reproduction apparatus.
  • the document reproduction apparatus may be, for example, a photocopier, a scanner, a fax, etc.
  • FIG. 7 shows a box K, a box M structure of maintaining the light source 1 which illuminate the document and an arm b to move the M support structure in the box K.
  • holding structure M also comprises coils Bei excitation and Bdi detection coils.
  • the detection head part of the detection device is here in solidarity with the structure M which maintains the source of light, which advantageously makes it possible to ensure sweeping the entire breeding area and place the sensor head very close to the document original.
  • Figures 8 and 9 show two examples secure paper documents according to the invention.
  • the Figure 8 shows the case where the filaments ferromagnets are distributed isotropically on the sheet of paper and figure 9 represents the case where the filaments are substantially aligned in a same direction.
  • the filaments ferromagnetic have a saturation field of value substantially less than or equal to 300 A / m.
  • the secure paper document according to the invention consists of a sheet of paper P in which are embedded, on the surface, ferromagnetic filaments amorphous sheathed glass F.
  • the filaments Ferromagnetic F are incorporated in the layer superficial paper at the time of the operation of sleeping.
  • the filaments are then dispersed in the colloidal aqueous suspension spread on the surface of the fibrous cellulosic support (coated paper).
  • Ferromagnetic filaments sheathed with glass can be produced by drawing a metal core melted content in a borosilicate glass tube as described in the referenced document "Ferromagnetic resonance in amorphous magnetic wires "by S.A. Baranov et al (Phys Met Metall., No. 1. vol 67, p 70-75, 1989). They can have one of the compositions following: CoFeSiB, or CoSiB, or FeSiB, with a proportion of Si + B substantially greater than 18% and substantially less than 35% so as to obtain a amorphous material, and more than 40% Co and Fe.
  • CoFeSiB CoSiB
  • FeSiB CoSiB
  • Si + B substantially greater than 18% and substantially less than 35% so as to obtain a amorphous material, and more than 40% Co and Fe.
  • We can add to these main constituents of elements such as: Ni (for example from 0 to 20%), Mo, Zr, Ge, Cr, Mn
  • Ferromagnetic filaments may be positive magnetostriction, in which case they present an important Barkhausen jump, or to negative magnetostriction, in which case they do not show no jump from Barkhausen.
  • the properties of such materials, depending on their composition, are well known as described in the referenced document "Magnetic hysteresis in glass-covered and water-quenched amorphous wires "by H. Chiriac, T. A. Ovari, M. Vasquez and A. Hernando (Journal of Magnetism and Magnetic Marerials 177-171, 1998, p 205 and 206).
  • the magnetization filaments with a jump from Barkhausen suddenly reverses twice a period in producing easily detectable flow variation by an antenna (coil of detection) located at proximity of the means creating the field of excitation.
  • the applied field must be greater than saturation field of the filaments.
  • the coil of detection can detect a flow pulse. This is due to the bistable character of the magnetization resulting from the magnetic characteristics of the alloy and magnetostriction actions produced by the sheath.
  • Filaments with negative magnetostriction do not presenting no jump from Barkhausen but having a saturation field less than a few hundred of A / m, also create harmonics in the same conditions. This is due to the fact that their magnetization varies non-linearly with time.
  • the preferred optimum length of filaments is close to 10 mm. It can also be of the order of 7 mm, without the modification of the anisotropy of form nor the effects of magnetostriction do not significantly modify the conditions of reversal of the magnetization and, hence the magnitude of the signal that remains essentially proportional to the amount of material incorporated in the paper.
  • the maximum total diameter of the bi-material filaments composite is usually less than 20 which makes it possible to fix the thickness of the latex polymer coating between 30 and 40 ⁇ m after drying, resulting in a total thickness of the paper (cellulosic support + coating of coating) of minus 80 ⁇ m. No upper limit is however imposed on the thickness of the secured paper sheet.
  • the small total diameter of the filaments allows the incorporation of these into the aqueous suspension colloidal latex polymer spread on the support cellulosic paper during the coating operation.
  • the concentration of ferromagnetic material in the secure paper must be substantially greater than 1 mg / m 2 .
  • the incorporation and dispersion of the filaments in the coating slip, which also contains white pigments and other additives in addition to the latex colloids, is effected by intensive stirring using, for example, Knife mixer.
  • the filaments, of high mechanical strength and particularly flexible, are advantageously not damaged by the brewing operation.
  • the sheath allows a good wetting of the surface of the filaments by the aqueous colloidal suspension, and the slip thus obtained is very homogeneous, without lumps, with a relatively low viscosity state and whose characteristics may remain stable during storage (for example, storage for a few hours at room temperature).
  • the coating is carried out by a Blade method, followed by pre-drying and possibly calendering. Because of the presence of the glass sheath, the metal fibers do not undergo significant corrosion in the liquid in suspension. It should be noted that when the fiber concentration does not exceed 80 mg / m 2 and the dispersion in the coating slip has been suitably carried out, the filaments are substantially elongated in the thickness of the layer. The presence of fibers in the added layer is then difficult to detect with the naked eye, to the point that the secure paper advantageously retains an appearance very close to the appearance of a non-secure paper, which aspect can be reinforced by the addition of a layer without filaments, for example of thickness 2 to 3 ⁇ m, covering the layer which contains the filaments.
  • the mechanical conditions sleeping paper at scroll speeds high levels result in a certain degree of alignment of filaments under the effect of viscosity forces within slip (see Figure 9).
  • the detection of such paper depends on the orientation according to which are introduced the sheets with respect to the detector, and, in the favorable case, the signal is significantly strengthened.
  • the filaments can cross without changing the properties of all. It should be noted that the phenomenon orientation does not occur for fibers short (for example between 5 to 8 mm long), the orientation is then statistical (see Figure 8).
  • the secure paper according to the invention can placed in the transceiver of a machine photocopy according to any type of format.
  • the presence of glass-wrapped metal filaments does not prevent the printing of characters on the paper. It is therefore easy to produce documents that need to be considered sensitive and non-disclosable.
  • the filaments are made by a known method derived from the Taylor process and which involves inductively heating a certain amount of metal introduced into a closed borosilicate glass tube. A filament is initiated and wrapped around a winder.
  • the glass used is a borosilicate glass Pyrex type, whose melting temperature is close to 600 ° C.
  • the metal alloy is of CoMnSiB type and contains an atomic proportion of Cobalt of between 75 and 80%.
  • the filaments are negative magnetostrictive and have an anisotropy field of 1 Oe, ie 80 A / m.
  • the filaments are cut to a length of 7mm and dispersed in the sleeping slip.
  • the concentration of filaments is greater than 5 g / m 2 . This preparation can be put on one of the faces or on both sides of the sheet of paper. At this concentration, the filaments are advantageously invisible when the thickness of the coating is between 30 and 40 ⁇ m. Writing or printing on paper is not hindered by the presence of the filaments.
  • Figure 10 shows a schematic diagram process of reproducing paper document according to the invention.
  • the method comprises a step 1 of insertion of the original document in the reproduction device followed by a step 2 of detecting the presence of paper Mark.
  • a detection device detects the presence or absence of marked paper.
  • the function of reproduction is inhibited (step 4).
  • the generation of a alarm or any other means of visualization and / or counting can also be integrated into the device detection to indicate the presence of marked paper.
  • the inhibition function can be canceled by a specific device leading to a reproduction authorization of the document (step 3).
  • the reproduction apparatus includes a detection device that is added to a existing reproduction device.
  • food added device can be done either autonomously using a resource of its own the means of reproduction.
  • device power by battery is not a problem.
  • the reproduction authorization despite the presence of a marked paper, can be done by any means that meets the organizational requirements of the industry or organization that uses the marked paper subject of the invention.
  • This authorization may be coded or not coded to the device of control. It is clear that in cases where this authorization is not used, the device added may be deprived of any entry allowing access to any authorization function (limitation of risks of piracy or deliberate diversion of authorization function).
  • the detection device for detecting the potential presence of a marked paper ensures a detection on the entire breeding surface and this even if there is a decrease in the surface of the paper to analyze (case of cutting a document confidential in an attempt to reproduce the document despite the marking).

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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)
  • Signal Processing (AREA)
  • Paper (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Burglar Alarm Systems (AREA)
  • Credit Cards Or The Like (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Cleaning In Electrography (AREA)
EP01947524A 2000-06-20 2001-06-19 Dispositif de detection de papier marque et papier marque detectable par le dispositif Expired - Lifetime EP1292932B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0007842 2000-06-20
FR0007842 2000-06-20
PCT/FR2001/001907 WO2001099076A1 (fr) 2000-06-20 2001-06-19 Dispositif de detection de papier marque et papier marque detectable par le dispositif

Publications (2)

Publication Number Publication Date
EP1292932A1 EP1292932A1 (fr) 2003-03-19
EP1292932B1 true EP1292932B1 (fr) 2004-04-07

Family

ID=8851436

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01947524A Expired - Lifetime EP1292932B1 (fr) 2000-06-20 2001-06-19 Dispositif de detection de papier marque et papier marque detectable par le dispositif

Country Status (10)

Country Link
US (1) US20030150921A1 (es)
EP (1) EP1292932B1 (es)
JP (1) JP4901052B2 (es)
AT (1) ATE263993T1 (es)
AU (1) AU2001269189A1 (es)
CA (1) CA2412900C (es)
DE (1) DE60102696T2 (es)
ES (1) ES2218426T3 (es)
IL (2) IL153106A0 (es)
WO (1) WO2001099076A1 (es)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR102013003501A2 (pt) * 2013-02-15 2015-01-06 Nathan Tafla Rabinovitch Processo para obtenção de folha celulósica magnética e o respectivo produto
RU2751691C1 (ru) * 2020-09-17 2021-07-16 Акционерное общество Научно-производственное предприятие "Интеграл" Способ идентификации носителя информации

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US520456A (en) * 1894-05-29 Steam-engine
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US4075618A (en) * 1976-07-15 1978-02-21 Minnesota Mining And Manufacturing Company Magnetic asymmetric antipilferage marker
ES2040343T3 (es) * 1987-06-08 1993-10-16 Esselte Meto International Gmbh Dispositivos magneticos.
DE3936547A1 (de) * 1989-11-02 1991-05-08 Siemens Ag Anordnung zur telemetrischen kommunikation zwischen zwei geraeten mittels eines magnetischen nahfeldes
JPH0617100Y2 (ja) * 1990-11-27 1994-05-02 行男 河野 世界時計
US5126720A (en) * 1991-01-17 1992-06-30 Knogo Corporation Method and apparatus for deactivating magnetic targets
US5271645A (en) * 1991-10-04 1993-12-21 Wicker Thomas M Pigment/fluorescence threshold mixing method for printing photocopy-proof document
WO1995001043A1 (fr) * 1993-06-22 1995-01-05 Omron Corporation Copieur comprenant un dispositif de traitement de l'image
GB9415780D0 (en) * 1994-08-04 1994-09-28 Portals Ltd A security thread, a film and a method of manufacture of a security thread
JPH08249651A (ja) * 1995-03-09 1996-09-27 Toppan Printing Co Ltd 磁気記録媒体とその製造方法
US5697649A (en) * 1995-05-11 1997-12-16 Crane & Co., Inc. Articles employing a magnetic security feature
US5568281A (en) * 1995-07-31 1996-10-22 Hewlett-Packard Co. Automatic document presence, skew and width detection method and apparatus for a document scanner
US5717381A (en) * 1995-12-21 1998-02-10 Eastman Kodak Company Copyright protection for photos and documents using magnetic elements
US5667924A (en) * 1996-02-14 1997-09-16 Xerox Corporation Superparamagnetic image character recognition compositions and processes of making and using
EP0798681A1 (en) * 1996-03-29 1997-10-01 Sensormatic Electronics Corporation Pulsed interrogation signal in harmonic EAS system
US5830609A (en) * 1996-05-10 1998-11-03 Graphic Arts Technical Foundation Security printed document to prevent unauthorized copying
US5992741A (en) * 1996-12-12 1999-11-30 Robertson; Paul Andrew Magnetic detection of security articles
JPH10240895A (ja) * 1997-02-28 1998-09-11 Tokin Corp 磁気カード及びその製造方法並びに使用方法
IL132499A0 (en) * 1999-10-21 2001-03-19 Advanced Coding Systems Ltd A security system for protecting various items and a method for reading a code pattern
FR2805618B1 (fr) * 2000-02-29 2002-04-12 Commissariat Energie Atomique Systeme d'authentification d'articles manufactures munis de marquages magnetiques, et procede de marquage de tels articles

Also Published As

Publication number Publication date
IL153106A (en) 2006-10-05
DE60102696T2 (de) 2005-03-31
ES2218426T3 (es) 2004-11-16
CA2412900C (en) 2011-04-26
ATE263993T1 (de) 2004-04-15
US20030150921A1 (en) 2003-08-14
JP2003536086A (ja) 2003-12-02
DE60102696D1 (de) 2004-05-13
JP4901052B2 (ja) 2012-03-21
WO2001099076A1 (fr) 2001-12-27
IL153106A0 (en) 2003-06-24
AU2001269189A1 (en) 2002-01-02
EP1292932A1 (fr) 2003-03-19
CA2412900A1 (en) 2001-12-27

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