WO1999067099A1 - Transferable magnetic film and its use - Google Patents

Transferable magnetic film and its use Download PDF

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Publication number
WO1999067099A1
WO1999067099A1 PCT/GB1999/001968 GB9901968W WO9967099A1 WO 1999067099 A1 WO1999067099 A1 WO 1999067099A1 GB 9901968 W GB9901968 W GB 9901968W WO 9967099 A1 WO9967099 A1 WO 9967099A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
tape
web
magnetic
substrate
Prior art date
Application number
PCT/GB1999/001968
Other languages
French (fr)
Inventor
David Howard Arnold
Michael David Crossfield
Original Assignee
Flying Null Limited
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 Flying Null Limited filed Critical Flying Null Limited
Priority to AU43831/99A priority Critical patent/AU4383199A/en
Publication of WO1999067099A1 publication Critical patent/WO1999067099A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F10/00—Thin magnetic films, e.g. of one-domain structure
    • H01F10/08—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers
    • H01F10/10—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition
    • H01F10/12—Thin magnetic films, e.g. of one-domain structure characterised by magnetic layers characterised by the composition being metals or alloys
    • H01F10/13—Amorphous metallic alloys, e.g. glassy metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/16—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like
    • B44C1/165—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like for decalcomanias; sheet material therefor
    • B44C1/17—Dry transfer
    • B44C1/1712—Decalcomanias applied under heat and pressure, e.g. provided with a heat activable adhesive
    • B44C1/1716—Decalcomanias provided with a particular decorative layer, e.g. specially adapted to allow the formation of a metallic or dyestuff layer on a substrate unsuitable for direct deposition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/16—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like
    • B44C1/165—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like for decalcomanias; sheet material therefor
    • B44C1/17—Dry transfer
    • B44C1/1733—Decalcomanias applied under pressure only, e.g. provided with a pressure sensitive adhesive
    • B44C1/1737—Decalcomanias provided with a particular decorative layer, e.g. specially adapted to allow the formation of a metallic or dyestuff on a substrate unsuitable for direct deposition

Definitions

  • Magnetic materials with very low coercivity and high permeability are of considerable value in remote sensing applications such as retail security and data tagging.
  • Pieces of such material can be driven in and out of saturation by easily-generated low-amplitude alternating magnetic fields, generating in turn re- radiated harmonic signals.
  • Very small amounts of material can generate signals of sufficient amplitude to be detected at considerable distances ( several tens of cms in some cases) using suitable coil antennas.
  • the invention is principally (but not exclusively) concerned with such magnetic materials.
  • Extrinsic magnetic properties of magnetic elements are determined not just by the nature of the magnetic material, but also by their shape.
  • permeability is directly related to the aspect ratio of the element (i.e. the ratio of its length to its cross sectional area) , and this typically needs to be greater than several thousand to one if the potential performance of high intrinsic permeability materials is not to be significantly compromised.
  • High aspect ratio is usually achieved by forming magnetic elements into long thin strips, fine wires or patches made from very thin film material.
  • Suitable small cross-section strip and wire materials for retail security and other applications are commercially available from Vacuumschmeltze (Germany), Allied Signal Corporation (USA) and Unitika (Japan). Typical lengths required to give a permeability sufficiently high for retail security applications are 30-60 mm.
  • Thin film material in the form of a 0.8 micron thin film sputter-deposited coating on a 23 micron PET backing is commercially available from 1ST (Belgium). Thin film material of the type manufactured by 1ST may be cut into very small patches, 5 square mm or less, and still achieve an extrinsic permeability of several thousand. This makes the material very suitable for compact, multi-element tags.
  • the desired format can be achieved by chemically removing thin film material from selected areas of a continuous layer. This is similar to processes used in the printed circuit board industry. It has the advantage that no carrier layer is required. However, the chemical process involves aggressive chemicals (e.g. ferric chloride) and the effluent produced is toxic and expensive to dispose of.
  • aggressive chemicals e.g. ferric chloride
  • Hot foil transfer is a process routinely used in the printing industry. It is also commonly employed in the manufacture of holograms. In essence, a thin plastic backing layer, usually in web form, is coated with a thermally-softenable release layer and a bonding layer. Metal (frequently aluminium) is then vacuum deposited onto the bonding layer, and subsequently overcoated with an adhesive layer. To transfer the decorative metal film onto a substrate (e.g. a document), a suitably-shaped heated die is used to stamp the metal film against the substrate. The die breaks out a correspondingly-shaped segment of the metal layer, and the heat releases it from the plastic carrier film, and bonds it down to the substrate.
  • a substrate e.g. a document
  • Cold foil transfer is used as an alternative to hot foil transfer and is widely used for adding foil features to printed packaging and the like.
  • the main difference from hot foil transfer is that non of the layers are heat-sensitive; and the tool used to effect transfer is not heated.
  • the metal layer is deposited onto a backing layer to which it bonds only weakly; and the metal layer (foil) is coated with a pressure-sensitive adhesive.
  • Tool pressure applied to the back of the carrier layer breaks out a segment of the metal foil, which is caused to bond to a substrate through the adhesive which has been activated by the pressure from the cold tool.
  • Rolling is sometimes used to transfer lines or bands of foil instead of stamping,
  • the tool is a roller of appropriate width.
  • Rolling is normally carried out as a cold process, but could in principle also be used as a hot-transfer process.
  • the present invention combines technology of the kind already employed for transfer printing, e.g. hot-foil transfer printing and cold-transfer processes such as rolling and stamping, with the technique of magnetic thin film deposition to produce a thin film magnetic layer which can be transferred in discrete elements from a backing layer onto a carrier or substrate.
  • the invention provides a transfer web or tape for transferring discrete areas of a magnetic film from the tape to a substrate, characterised in that the web or tape comprises: (i) a backing layer;
  • the magnetic layer is in the form of a thin film of a high permeability, low coercivity amorphous magnetic alloy.
  • the particular choice of material for the release layer, the bonding layer and the adhesive layer will be determined by the nature of the transfer process intended, i.e. whether a hot- or cold-transfer process is to be used. Materials suitable for both types of transfer process are well known.
  • the backing layer is a polyethylene terephthalate film, preferably of a thickness in the range from 10 to 40 microns.
  • a method of depositing a discrete area of an amorphous magnetic material onto a substrate which comprises transferring the magnetic material by a transfer process from a web or tape as defined above onto the substrate.
  • a backing layer typically a plastics material
  • a release layer on which is superimposed a bonding layer
  • the resulting intermediate is sputter coated with a thin film of high permeability, low coercivity amorphous magnetic alloy.
  • a layer of an adhesive typically a heat-sensitive adhesive
  • the resultant article is then ready for use as a transfer web in a hot stamping process, whereby elements of magnetic film of preselected shape, number and mutual disposition may be transferred from the article onto a final substrate in the desired pattern by using a heated stamping die or dies.
  • this method produces a very small increase in thickness (typically c. 1 micron) of the substrate, achieves good material utilisation, and avoids the production of toxic effluents.
  • a polyethylene terephthalate backing film 1 is first coated in a manner known per se with a conventional heat-sensitive release layer 2.
  • a bonding layer 3 is formed over the release layer 2 in a manner known per se.
  • the resulting intermediate (comprising layers 1, 2 and 3) is then used in a sputter coating machine (not shown) to deposit a layer of an amorphous magnetic metal alloy 4 over the bonding layer 3.
  • Sputter coating machines and their operation are well known and do not need to be described in detail herein.
  • the sputter-coated pre- web thereby formed is next coated with a heat-sensitive adhesive layer 5 which bonds to and overcoats the magnetic layer 4 to generate thereby a transfer web 6.
  • Web 6 is then placed over a selected substrate 8 at a controlled separation therefrom (as indicated by air gap 7 in Figure 2 ) and then a heated stamping die 10 of suitable shape and size is used to bring web 6 and substrate 8 together.
  • the heat and pressure causes bonding layer 3 to separate from release layer 2, and simultaneously activates the heat-sensitive adhesive 5 which thus bonds to substrate 8.
  • die-shaped metal film fragments 9 are transfer-bonded to the surface of substrate 8, as shown in Figures 3 and 4. It will be evident that the shape, size and number of fragments or patches transferred to substrate 8 can be selected at will; it is only necessary to use a suitable stamping die, or two or more dies, to achieve the desired result.
  • the transfer process is effective in substantially the same manner as described above, except that the adhesive layer will be a pressure-activated material instead of a heat-activated material; similarly, the release layer will be a pressure-sensitive release material.
  • a thermally transferable magnetic film such as described above constitutes one aspect of this invention.
  • the process for producing a magnetic film bonded to a substrate via such a thermally transferable magnetic film constitutes another embodiment of this invention. In both of these embodiments, it is possible to make routine modifications without departing from the scope of the invention.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

A transfer web or tape for transferring discrete areas of a magnetic film from the tape to a substrate is disclosed, the web or tape comprising: (i) a backing layer; (ii) a release layer carried on one face of said backing layer; (iii) a bonding layer overlying said release layer; (iv) a magnetic layer overlying said bonding layer; and (v) an adhesive layer overlying said magnetic layer. Preferably, the magnetic layer is in the form of a thin film of a high permeability, low coercivity amorphous magnetic alloy. Transfer can be achieved by hot- or cold-transfer processes such as stamping and rolling.

Description

Transferable Magnetic Film and its Use
Background
Magnetic materials with very low coercivity and high permeability are of considerable value in remote sensing applications such as retail security and data tagging. Pieces of such material can be driven in and out of saturation by easily-generated low-amplitude alternating magnetic fields, generating in turn re- radiated harmonic signals. Very small amounts of material can generate signals of sufficient amplitude to be detected at considerable distances ( several tens of cms in some cases) using suitable coil antennas. The invention is principally (but not exclusively) concerned with such magnetic materials.
Extrinsic magnetic properties of magnetic elements are determined not just by the nature of the magnetic material, but also by their shape. In particular, permeability is directly related to the aspect ratio of the element (i.e. the ratio of its length to its cross sectional area) , and this typically needs to be greater than several thousand to one if the potential performance of high intrinsic permeability materials is not to be significantly compromised.
High aspect ratio is usually achieved by forming magnetic elements into long thin strips, fine wires or patches made from very thin film material. Suitable small cross-section strip and wire materials for retail security and other applications are commercially available from Vacuumschmeltze (Germany), Allied Signal Corporation (USA) and Unitika (Japan). Typical lengths required to give a permeability sufficiently high for retail security applications are 30-60 mm. Thin film material in the form of a 0.8 micron thin film sputter-deposited coating on a 23 micron PET backing is commercially available from 1ST (Belgium). Thin film material of the type manufactured by 1ST may be cut into very small patches, 5 square mm or less, and still achieve an extrinsic permeability of several thousand. This makes the material very suitable for compact, multi-element tags.
For certain applications in retail security and multi-element magnetic tagging, it is necessary to place one or more patches of thin film material onto a carrier or substrate. At present this is done by cutting a thin film coated PET into the desired form, and bonding it into place. This process involves a number of processing steps, and can lead to a composite label which is excessively thick for some applications.
For some other applications where multi-element tags are required, the desired format can be achieved by chemically removing thin film material from selected areas of a continuous layer. This is similar to processes used in the printed circuit board industry. It has the advantage that no carrier layer is required. However, the chemical process involves aggressive chemicals (e.g. ferric chloride) and the effluent produced is toxic and expensive to dispose of.
Hot foil transfer is a process routinely used in the printing industry. It is also commonly employed in the manufacture of holograms. In essence, a thin plastic backing layer, usually in web form, is coated with a thermally-softenable release layer and a bonding layer. Metal (frequently aluminium) is then vacuum deposited onto the bonding layer, and subsequently overcoated with an adhesive layer. To transfer the decorative metal film onto a substrate (e.g. a document), a suitably-shaped heated die is used to stamp the metal film against the substrate. The die breaks out a correspondingly-shaped segment of the metal layer, and the heat releases it from the plastic carrier film, and bonds it down to the substrate.
Cold foil transfer is used as an alternative to hot foil transfer and is widely used for adding foil features to printed packaging and the like. The main difference from hot foil transfer is that non of the layers are heat-sensitive; and the tool used to effect transfer is not heated. Typically, the metal layer is deposited onto a backing layer to which it bonds only weakly; and the metal layer (foil) is coated with a pressure-sensitive adhesive. Tool pressure applied to the back of the carrier layer (again, typically PET) breaks out a segment of the metal foil, which is caused to bond to a substrate through the adhesive which has been activated by the pressure from the cold tool.
Rolling is sometimes used to transfer lines or bands of foil instead of stamping, In this case, the tool is a roller of appropriate width. Rolling is normally carried out as a cold process, but could in principle also be used as a hot-transfer process.
Despite the widespread use of such techniques in the printing industry, where the transfer effected is that of a thin metal layer, there have been no suggestions hitherto ( so far as we are aware) that such a technique could successfully be employed when the material to be transferred is an amorphous metal alloy, e.g. an amorphous metal glass, or a similar material having magnetic properties. The invention
The present invention combines technology of the kind already employed for transfer printing, e.g. hot-foil transfer printing and cold-transfer processes such as rolling and stamping, with the technique of magnetic thin film deposition to produce a thin film magnetic layer which can be transferred in discrete elements from a backing layer onto a carrier or substrate.
Accordingly, in one aspect the invention provides a transfer web or tape for transferring discrete areas of a magnetic film from the tape to a substrate, characterised in that the web or tape comprises: (i) a backing layer;
( ii ) a release layer carried on one face of said backing layer;
(iii) a bonding layer overlying said release layer; (iv) a magnetic layer overlying said bonding layer; and
(V) an adhesive layer overlying said magnetic layer.
Advantageously, the magnetic layer is in the form of a thin film of a high permeability, low coercivity amorphous magnetic alloy.
The particular choice of material for the release layer, the bonding layer and the adhesive layer will be determined by the nature of the transfer process intended, i.e. whether a hot- or cold-transfer process is to be used. Materials suitable for both types of transfer process are well known.
Conveniently, the backing layer is a polyethylene terephthalate film, preferably of a thickness in the range from 10 to 40 microns.
According to another aspect of the invention, there is provided a method of depositing a discrete area of an amorphous magnetic material onto a substrate, which comprises transferring the magnetic material by a transfer process from a web or tape as defined above onto the substrate.
In the present invention a backing layer ( typically a plastics material ) is coated first with a release layer on which is superimposed a bonding layer, and the resulting intermediate is sputter coated with a thin film of high permeability, low coercivity amorphous magnetic alloy. After sputter-coating, a layer of an adhesive (typically a heat-sensitive adhesive) is coated onto the sputtered metal layer. The resultant article is then ready for use as a transfer web in a hot stamping process, whereby elements of magnetic film of preselected shape, number and mutual disposition may be transferred from the article onto a final substrate in the desired pattern by using a heated stamping die or dies.
Compared to existing processes, this method produces a very small increase in thickness (typically c. 1 micron) of the substrate, achieves good material utilisation, and avoids the production of toxic effluents.
Figures 1-4 of the accompanying drawings illustrate the process of this invention.
Referring now to the drawings, a polyethylene terephthalate backing film 1 is first coated in a manner known per se with a conventional heat-sensitive release layer 2. Next, a bonding layer 3 is formed over the release layer 2 in a manner known per se. The resulting intermediate (comprising layers 1, 2 and 3) is then used in a sputter coating machine (not shown) to deposit a layer of an amorphous magnetic metal alloy 4 over the bonding layer 3. Sputter coating machines and their operation are well known and do not need to be described in detail herein. The sputter-coated pre- web thereby formed is next coated with a heat-sensitive adhesive layer 5 which bonds to and overcoats the magnetic layer 4 to generate thereby a transfer web 6.
Web 6 is then placed over a selected substrate 8 at a controlled separation therefrom (as indicated by air gap 7 in Figure 2 ) and then a heated stamping die 10 of suitable shape and size is used to bring web 6 and substrate 8 together. The heat and pressure causes bonding layer 3 to separate from release layer 2, and simultaneously activates the heat-sensitive adhesive 5 which thus bonds to substrate 8. Thus die-shaped metal film fragments 9 are transfer-bonded to the surface of substrate 8, as shown in Figures 3 and 4. It will be evident that the shape, size and number of fragments or patches transferred to substrate 8 can be selected at will; it is only necessary to use a suitable stamping die, or two or more dies, to achieve the desired result.
Where the invention utilises a cold-transfer process, e.g. rolling or stamping, the transfer process is effective in substantially the same manner as described above, except that the adhesive layer will be a pressure-activated material instead of a heat-activated material; similarly, the release layer will be a pressure-sensitive release material. A thermally transferable magnetic film such as described above constitutes one aspect of this invention. The process for producing a magnetic film bonded to a substrate via such a thermally transferable magnetic film constitutes another embodiment of this invention. In both of these embodiments, it is possible to make routine modifications without departing from the scope of the invention.

Claims

CLAIMS :
1. A transfer web or tape for transferring discrete areas of a magnetic film from the tape to a substrate, characterised in that the web or tape comprises :
(i) a backing layer;
( ii ) a release layer carried on one face of said backing layer; ( iii ) a bonding layer overlying said release layer;
(iv) a magnetic layer overlying said bonding layer; and
(v) an adhesive layer overlying said magnetic layer.
2. A tape or web as claimed in claim 1, wherein said magnetic layer is in the form of a thin film of a high permeability, low coercivity amorphous magnetic alloy.
3. A web or tape as claimed in claim 1 or 2, wherein all of said layers are substantially coterminous .
4. A web or tape as claimed in claim 1, 2 or 3, wherein said magnetic layer is deposited onto said bonding layer by sputtering.
5. A web or tape as claimed in claim 1, 2, 3 or 4, wherein said adhesive layer consists of a heat- activatable adhesive material.
6. A web or tape as claimed in claim 1 , 2 , 3 or 4, wherein said adhesive layer consists of a pressure- activatable adhesive material .
7. A web or tape as claimed in any preceding claim, wherein said backing layer is a polyethylene terephthalate film.
8. A web or tape as claimed in claim 7, wherein said PET film is from 10 to 40 microns in thickness.
9. A method of depositing a discrete area of an amorphous magnetic material onto a substrate, which comprises transferring the magnetic material by a transfer process from a web or tape as claimed in claim 1 onto the substrate.
10. A method according to claim 9, wherein said transfer process is a hot-stamping process.
AMENDED CLAIMS
[received by the International Bureau on 02 December 1999 (02.12.99); original claims 1-10 replaced by new amended claims 1-9 (2 pages)]
1. A transfer web or tape for transferring discrete areas of a magnetic film from the tape to a substrate, characterised in that:
(a) the web or tape comprises:
(i) a backing layer;
( ii ) a release layer carried on one face of said backing layer; ( iii ) a bonding layer overlying said release layer;
(iv) a magnetic layer overlying said bonding layer; and
(v) an adhesive layer overlying said magnetic layer; and in that:
(b) said magnetic layer is in the form of a thin film of a high permeability, low coercivity amorphous magnetic alloy.
2. A web or tape as claimed in claim 1, wherein all of said layers are substantially coterminous.
3. A web or tape as claimed in claim 1 or 2, wherein said magnetic layer is deposited onto said bonding layer by sputtering.
4. A web or tape as claimed in claim 1, 2, or 3, wherein said adhesive layer consists of a heat- activatable adhesive material.
5. A web or tape as claimed in claim 1, 2, or 3, wherein said adhesive layer consists of a pressure- activatable adhesive material.
6. A web or tape as claimed in any preceding claim, wherein said backing layer is a polyethylene terephthalate film.
7. A web or tape as claimed in claim 6, wherein said PET film is from 10 to 40 microns in thickness.
8. A method of depositing a discrete area of an amorphous magnetic material onto a substrate, which comprises transferring the magnetic material by a transfer process from a web or tape as claimed in claim 1 onto the substrate.
9. A method according to claim 8, wherein said transfer process is a hot-stamping process.
PCT/GB1999/001968 1998-06-23 1999-06-23 Transferable magnetic film and its use WO1999067099A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU43831/99A AU4383199A (en) 1998-06-23 1999-06-23 Transferable magnetic film and its use

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9813563.5A GB9813563D0 (en) 1998-06-23 1998-06-23 Transferable magnetic film and its uses
GB9813563.5 1998-06-23

Publications (1)

Publication Number Publication Date
WO1999067099A1 true WO1999067099A1 (en) 1999-12-29

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PCT/GB1999/001968 WO1999067099A1 (en) 1998-06-23 1999-06-23 Transferable magnetic film and its use

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GB (1) GB9813563D0 (en)
WO (1) WO1999067099A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001069288A1 (en) * 2000-03-14 2001-09-20 Laboratoire D'electronique Angelidis Et Sarrault Method for detecting and identifying an object among a plurality of objects, and device therefor
US10325439B2 (en) 2015-07-03 2019-06-18 Custom Security Industries, Inc. Article identification reader, marker element for article identification and method of article identification

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5038321B1 (en) * 1970-12-26 1975-12-09
JPS6126931A (en) * 1984-07-14 1986-02-06 Hitachi Maxell Ltd Magnetic tape for transfer
JPS61113129A (en) * 1984-11-07 1986-05-31 Hitachi Maxell Ltd Magnetic tape for transfer
EP0295028A1 (en) * 1987-06-08 1988-12-14 Esselte Meto International GmbH Magnetic devices
JPH0375198A (en) * 1989-08-15 1991-03-29 Toppan Printing Co Ltd Transfer sheet
JPH05212979A (en) * 1992-02-03 1993-08-24 Nitto Denko Corp Magnetic film transfer sheet

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5038321B1 (en) * 1970-12-26 1975-12-09
JPS6126931A (en) * 1984-07-14 1986-02-06 Hitachi Maxell Ltd Magnetic tape for transfer
JPS61113129A (en) * 1984-11-07 1986-05-31 Hitachi Maxell Ltd Magnetic tape for transfer
EP0295028A1 (en) * 1987-06-08 1988-12-14 Esselte Meto International GmbH Magnetic devices
JPH0375198A (en) * 1989-08-15 1991-03-29 Toppan Printing Co Ltd Transfer sheet
JPH05212979A (en) * 1992-02-03 1993-08-24 Nitto Denko Corp Magnetic film transfer sheet

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 7602, Derwent World Patents Index; Class A14, AN 76-02984X, XP002116379 *
DATABASE WPI Section Ch Week 8612, Derwent World Patents Index; Class A85, AN 86-078385, XP002116377 *
DATABASE WPI Section Ch Week 8628, Derwent World Patents Index; Class A84, AN 86-179679, XP002116378 *
PATENT ABSTRACTS OF JAPAN vol. 015, no. 239 (M - 1126) 20 June 1991 (1991-06-20) *
PATENT ABSTRACTS OF JAPAN vol. 017, no. 652 (M - 1520) 3 December 1993 (1993-12-03) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001069288A1 (en) * 2000-03-14 2001-09-20 Laboratoire D'electronique Angelidis Et Sarrault Method for detecting and identifying an object among a plurality of objects, and device therefor
FR2806483A1 (en) * 2000-03-14 2001-09-21 Electronique Angelidis Et Sarr METHOD FOR DETECTION AND IDENTIFICATION OF AN OBJECT AMONG A PLURALITY OF OBJECTS, AND DEVICE FOR ITS IMPLEMENTATION
US10325439B2 (en) 2015-07-03 2019-06-18 Custom Security Industries, Inc. Article identification reader, marker element for article identification and method of article identification

Also Published As

Publication number Publication date
AU4383199A (en) 2000-01-10
GB9813563D0 (en) 1998-08-19

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