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EP0328320A1 - Security device - Google Patents

Security device

Info

Publication number
EP0328320A1
EP0328320A1 EP19890301071 EP89301071A EP0328320A1 EP 0328320 A1 EP0328320 A1 EP 0328320A1 EP 19890301071 EP19890301071 EP 19890301071 EP 89301071 A EP89301071 A EP 89301071A EP 0328320 A1 EP0328320 A1 EP 0328320A1
Authority
EP
Grant status
Application
Patent type
Prior art keywords
photochromic
yarn
light
compound
example
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.)
Withdrawn
Application number
EP19890301071
Other languages
German (de)
French (fr)
Inventor
Peter Wright
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.)
Courtaulds PLC
Original Assignee
Courtaulds PLC
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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Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02Forms or constructions
    • G09F3/0291Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time
    • G09F3/0294Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time where the change is not permanent, e.g. labels only readable under a special light, temperature indicating labels and the like
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06HMARKING, INSPECTING, SEAMING OR SEVERING TEXTILE MATERIALS
    • D06H1/00Marking textile materials; Marking in combination with metering or inspecting
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06QDECORATING TEXTILES
    • D06Q1/00Decorating textiles

Abstract

One or more threads of a photochromic yarn are used as a security device in woven material, for example a label (1). The threads are substantially colourless when ir­radiated with visible light but are reversibly converted to a coloured state (2) when irradiated with ultraviolet light.

Description

  • [0001]
    This invention relates to a security device for use in marking articles such as goods, packages or identification cards to prove their authenticity.
  • [0002]
    The device is based on the use of photochromic com­pounds. A photochromic compound is a compound that under­goes a colour change when irradiated with light of a certain wavelength, which colour change is usually rever­sible. In general the compounds become coloured when irradiated with UV light and convert to a pale or colour­less form in visible light.
  • [0003]
    It is known to use photochromic compounds by coating them onto or incorporating them into a support such as a film or plate. For example, GB-A-1,600,615 describes coating a film with a photochromic compound and using the coated film as a means for holographic data storage.
  • [0004]
    It has also been suggested to make photochromic fibre by dyeing fibre with a photochromic dye, or by incorporat­ing photochromic compound into fibre. FR-A-1,588,282 describes a process for producing polyvinylidene chloride, polyester, polyacrylonitrile, polypropylene or polyamide fibre containing an indolino-spiropyran photochromic compound. The photochromic compound is incorporated into the spinning dope prior to spinning the fibre. Alterna­tively, the photochromic compound can be fixed to a fibre by soaking the fibre with a solution of the photochromic compound
  • [0005]
    JP-A-60-21975 describes a method for producing a photochromic fibre in which a spiropyran compound is mixed with a monomer, fibre is impregnated with the monomer and the monomer is polymerised within the fibre. It is stated that the fibre can be used for clothes, dresses, parasols and bags for special fashion effects.
  • [0006]
    JP-A-61-179399 describes the preparation of a photo­chromic fibre by causing photochromic transition metal acids to adhere to or be impregnated into various fibres, and reacting the resulting product with a water-soluble condensation resin or polymerisation resin. The fibres can be used as a raw material for the production of security paper or confidential documents.
  • [0007]
    The present invention is a novel application of photochromic compound for security purposes and accordingly provides a security device comprising woven material containing one or more threads of photochromic yarn, the yarn being substantially colourless when irradiated with visible light and reversibly converting to a coloured state when irradiated with UV light.
  • [0008]
    One suitable form of the device according to the invention is a label. The label can be attached, by way of sewing, adhering or the like, to an authentic article such as a garment, bag, towel, linen, blanket, carpet, fabric or other textile piece good, or a non-textile article, by the manufacturer. The photochromic yarn incorporated in the label is invisible under normal light conditions and so the label appears as an ordinary identification label. However, when the label is irradiated with UV light the photochromic yarn becomes coloured and is visible to the naked eye. Any article not carrying a label with a colour­able thread can be readily identified as counterfeit. After irradiation with UV light, the photochromic yarn will gradually revert to colourless under normal light condi­tions, or it can be rapidly converted back by irradiating the label with strong white light. The label then appears to be an ordinary identification label once more. UV light sources are widely available, portable and easy to use, the irradiation not normally taking longer than a few seconds. In addition the UV light does not damage the article to which the label is attached. Thus the device according to the invention provides a convenient, harmless and relative­ly inexpensive method of protecting authentic articles against counterfeiting.
  • [0009]
    In an alternative embodiment of the invention and where the authentic article to be protected is a woven article, such as a roll of fabric or other textile piece good, the photochromic yarn can be incorporated directly within the article by, for example, weaving a thread into its edge.
  • [0010]
    The photochromic yarn is preferably incorporated into the woven material of the security device by weaving. It may be incorporated as either a weft or warp yarn, but is preferably a weft yarn. The resulting material may contain any number of photochromic threads in any suitable pattern, depending upon the desired arrangement and complexity. Surprisingly it has been found that, for white or pale materials, one single thread of photochromic yarn is sufficient for yarn to be seen when the material is ir­radiated with UV light.
  • [0011]
    The photochromic yarn comprises fibre containing or treated with a photochromic compound or mixture of photo­chromic compounds. Two classes of generally suitable photo­chromic compounds are the spiropyrans and spiro-oxazines, although their properties must be checked to ensure they are colourless or near-colourless under normal light condi­tions. Examples of spiro-pyrans and spiro-oxazines that can be used include 1′,3′,3′-trimethylindolino-6-nitroben­zospiropyran, 6,8-dichloro-1′,3′,3′-trimethyl-indolinoben­zospiropyran and spiroindolinonaphthoxazine.
  • [0012]
    Other classes of suitable photochromic compounds are the fulgides and fulgimides. Examples of such compounds are described in GB-A-1,442,628, 1,464,603 and 2,170,202 and in our co-pending UK Patent Application 8830336, the disclosures of which are incorporated herein by reference.
  • [0013]
    The photochromic compound is preferably incorporated into the fibre prior to spinning, conveniently by dissolv­ing or dispersing the photochromic compound into the spinning dope or melt. Any polymeric material can be used that is capable of containing a photochromic compound and being spun into a fibre without adversely affecting the photochromic compound, and that is transparent to light having the wavelength required to convert the photochromic compound from colourless to coloured or vice versa. Examples of polymeric materials that can be spun into fibre from a spinning dope into which a photochromic compound is incorporated include cellulose acetate, acrylics, for example polyacrylonitrile or polymethylmethacrylate, polyurethanes, polycarbonates, vinyl polymers, for example polyvinylalcohol, polyvinylacetate or polyvinylchloride, and regenerated cellulose. Cellulose acetate, especially secondary cellulose acetate, is preferred. The photo­chromic compound is preferably dissolved in the spinning dope, so that it is more uniformly dispersed in the fibre formed. The photochromic fulgides, spiropyrans and spiro-­oxazines for instance are soluble in a wide range of organic solvents, for example ketones such as acetone or methylethyl ketone, esters such as ethyl acetate, aromatic hydrocarbons such as toluene, chlorinated hydrocarbons such as chloroform or methylene chloride, or ethers. They are not soluble in aliphatic hydrocarbons, are reactive to some extent with lower alcohols such as methanol and ethanol and are only sparingly soluble in water. The photochromic fulgides, spiropyrans and spiro-oxazines, for example, can readily be incorporated in an acetone-based cellulose acetate dope. The photochromic compound may be mixed directly into the spinning dope, but it is preferred first to form a solution of the photochromic compound by dissolving the compound in a little of the spinning dope solvent and then mixing this into the dope. Alternatively the photochromic compound, in particulate form, may be dispersed into the spinning dope, this being necessary, for example, when the photochromic compound is insoluble in the spinning dope, as is the case when the spinning solvent is water.
  • [0014]
    Examples of polymer melts into which the photochromic compound can be dispersed prior to spinning include poly­olefins for example polyethylene, polypropylene or copoly­mers thereof, polyesters for example polyethylene tereph­thalate, polycarbonates and polyamides.
  • [0015]
    Any conventional technique may be employed for spinning the fibre such as wet, dry, air-gap or melt spinning, although where melt spinning is carried out it is important that the temperature does not exceed that which would thermally degrade the photochromic compound.
  • [0016]
    The concentration of the photochromic compound in the resulting fibre is preferably 0.1 to 20% by weight based on the total weight of the fibre, more preferably 0.2 to 2%. Correspondingly the proportion of photochromic compound in the spinning dope is generally 0.01 to 10% by weight based on the total weight of the dope, more preferably 0.04 to 1%.
  • [0017]
    In an alternative embodiment, the photochromic fibre may have a core-sheath structure, the photochromic compound being incorporated in the sheath component. The polymeric material of the sheath component may be the same or dif­ferent from the polymeric material of the core component.
  • [0018]
    The woven material that comprises the security device may be woven from any suitable textile yarn, for example cellulose acetate, viscose, solvent-spun cellulose, cotton, wool, silk, nylon, polyester or acrylic yarn or a mixture thereof. Cellulose acetate or polyester is generally preferred.
  • [0019]
    The invention will now be illustrated by the following Examples and with reference to the accompanying drawings in which:
    • Figures 1A and 1B show a label before and after irradiation with UV light; and
    • Figures 2A and 2B show an alternative label before and after irradiation with UV light.
  • [0020]
    Irradiation with UV light was carried out using a 125W mercury arc lamp (Phillips HPR 125W) transmitted through a 3mm thick, 300-400mm band pass filter (Schott glass UG1). Irradiation with white light was carried out using a 375W photoflood lamp (Phillips PF215) transmitted through a 3mm thick, 420mm cut-off filter (Schott glass GG420).
  • Example 1
  • [0021]
    A solution of photochromic compound was first prepared by dissolving 5g of the fulgide alpha-2,5-dimethyl-3-­furylethylidene (isopropylidene) succinic anhydride in 50ml acetone. The mixture was stirred for 2 hours to ensure complete dissolution.
  • [0022]
    The solution was then added to 2kg of acetone-based cellulose diacetate spinning dope having the following composition:
    Dope concentration : 27.8% w/w solids
    Dope viscosity : 115 Pa s (1150 poise) at 25°C
    Water content : 3.1%
    Acetyl value of flake : 54.8
    Flake viscosity : 100 mPa s (100 centipoise) at 6% concentration
    Amount of photochromic compound : 0.25 w/w dope
    The dope was agitated by rolling for 24 hours to ensure complete mixing.
  • [0023]
    Fibre was spun from the dope using conventional dry spinning techniques. The dope was maintained at a tempera­ture of 60°C and was pumped through a 42 hole x 50 micro­metres spinneret at a rate of 12 mls/min. The fibre was spun into a drying cell having an upper cell temperature of 60°C and a lower cell temperature of 100°C and an air flow of 0.57 m³ (20 standard cubic feet) per minute. The resulting yarn was taken up at a speed of 200 m/min on a cheesewinder. Between the take-up godet and the cheese­winder the yarn was interlaced using an air jet. The resulting yarn was 167(42) (decitex 167, no. of filaments 42), and was a very pale yellow with a shiny appearance. A matt yarn can be produced by adding titanium dioxide to the spinning dope.
  • Example 2
  • [0024]
    A solution of photochromic compound was prepared by dissolving 0.4g of the spiropyran 1′,3′,3′-trimethylin­dolino-6-nitrobenzospiropyran in 50ml acetone. The mixture was shaken for 1 hour.
  • [0025]
    The solution was then added to 1.4kg of cellulose acetate spinning dope having the same composition as that described in Example 1, and blended for 24 hours by roll­ing.
  • [0026]
    A 167 (42) yarn was spun from the dope using the same spinning conditions as described in Example 1. The result­ing yarn was a very pale pink colour with a bright ap­pearance.
  • Example 3
  • [0027]
    The photochromic yarn as produced in Example 1 was woven together with a cellulose diacetate yarn known as Dicel (Registered Trade Mark), available from Courtaulds Fibres Ltd., into a fabric. The fabric had a 1 and 3 broken twill construction. The warp yarn was solely Dicel, and the weft yarn was a combination of photochromic yarn (1 over 6mm) and Dicel, each photochromic region consisting of 20 picks photochromic yarn.
  • [0028]
    The resulting fabric was slit into a number of labels measuring 40mm x 30mm. One of these labels is shown in Figures 1A and 1B. In visible light, before irradiation with UV light, the label 1 is completely white as shown in Figure 1A and the photochromic threads could not be seen. After irradiation with UV light for 20 seconds magenta-­coloured stripes 2 appeared where the photochromic yarn had been woven in, as shown in Figure 1B. The stripes were each approximately 7mm in width and ran along the length of the label 1 in the weft direction. Subsequent irradiation with white light for 30 seconds caused the photochromic compound to revert to its near colourless form and the magenta stripes 2 disappeared, the label 1 again having the plain white appearance as shown in Figure 1A.
  • Example 4
  • [0029]
    The photochromic yarn as produced in Example 1 was woven into a fabric as described in Example 3 except that the weft yarn was a combination of photochromic yarn (1 over 50mm) and Dicel, and each photochromic region con­sisted of only one single pick of photochromic yarn.
  • [0030]
    The resulting fabric was slit into a number of labels measuring 50mm x 30mm. One of these labels is shown in Figures 2A and 2B. In visible light, before being ir­radiated with UV light, the label 10 appears completely white. After irradiation with UV light for 20 seconds the photochromic thread was clearly seen as a single magenta-­coloured line 12 against the white background as shown in Figure 2B. After subsequent irradiation for 30 seconds with white light the magenta line disappeared and the label once more was completely white.
  • Example 5
  • [0031]
    The photochromic yarn as produced in Example 2 was woven into a fabric and the fabric slit into labels as described in Example 4.
  • [0032]
    After irradiation of a label with UV light the single photochromic thread was clearly seen as a purple line against a white background. After subsequent irradiation with white light the photochromic compound reverted to its near colourless state and the photochromic thread was no longer visible.
  • Example 6
  • [0033]
    The photochromic yarn as produced in example 1 was woven together with polyester yarn into a fabric. The warp was solely 76 (24) polyester and the weft was a combina­tion of 167 (30) polyester with 4 picks of the photochromic yarn inserted every 200mm.
  • [0034]
    After irradiation of the fabric with UV light for 30 seconds magenta-coloured stripes appeared, each measuring approximately 2 mm in width. After subsequent irradiation with white light for 20 seconds the photochromic compound reverted to its near colourless state and the stripes were no longer visible.

Claims (10)

1. A security device comprising woven material containing one or more threads of photochromic yarn, the yarn being substantially colourless when irradiated with visible light and reversibly converting to a coloured state when irradiated with UV light.
2. A security device as claimed in claim 1, which is in the form of a label.
3. A security device as claimed in claim 1 or 2, wherein the photochromic yarn is woven into the woven material.
4. A security device as claimed in any preceding claim, wherein the device comprises one thread of photo­chromic yarn incorporated in the woven material.
5. A security device as claimed in any preceding claim, wherein the photochromic yarn comprises cellulose acetate fibre having photochromic compound incorporated therein.
6. A security device as claimed in claim 5, wherein the photochromic compound is a spiropyran or a spiro-­oxazine.
7. A security device as claimed in claim 5, wherein the photochromic compound is a fulgide or fulgimide.
8. The use of one or more threads of photochromic yarn as a security device in woven material, the yarn being substantially colourless when irradiated with visible light and reversibly converting to a coloured state when ir­radiated with UV light.
9. The use as claimed in claim 8, wherein the woven material is a label.
10. The use as claimed in claim 8, wherein the woven material is a textile piece good and a thread of photo­chromic yarn is woven into an edge thereof.
EP19890301071 1988-02-05 1989-02-03 Security device Withdrawn EP0328320A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB8802590A GB8802590D0 (en) 1988-02-05 1988-02-05 Fibre
GB8802590 1988-02-05

Publications (1)

Publication Number Publication Date
EP0328320A1 true true EP0328320A1 (en) 1989-08-16

Family

ID=10631127

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890301071 Withdrawn EP0328320A1 (en) 1988-02-05 1989-02-03 Security device

Country Status (2)

Country Link
EP (1) EP0328320A1 (en)
GB (1) GB8802590D0 (en)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0488902A1 (en) * 1990-11-29 1992-06-03 Arjo Wiggins S.A. Security document including a security element having photochromic properties
US5289547A (en) * 1991-12-06 1994-02-22 Ppg Industries, Inc. Authenticating method
EP0621574A1 (en) * 1993-04-19 1994-10-26 Nakamura Label Co. Ltd. Forgery-preventing textured or printed emblem
WO1995033094A1 (en) * 1994-05-31 1995-12-07 I.L.C. Del Dotto S.R.L. Safety yarn and process for its manufacture
US5592561A (en) * 1994-04-14 1997-01-07 Moore; Lewis J. Anti-counterfeiting system
GB2306438A (en) * 1995-10-26 1997-05-07 Nakamura Label Inc Forgery-preventing label
EP0798415A3 (en) * 1996-02-10 1998-06-03 Hueck Folien GmbH & Co. KG Flat textile element
WO1999014416A1 (en) * 1997-09-12 1999-03-25 Nocopi Technologies, Inc. Authenticating a textile product
EP0919650A1 (en) * 1997-11-29 1999-06-02 Rinke Etiketten Karl Rinke GmbH & Co. KG Woven strip, particularly label strip, and method of manufacturing and using the same
US6068895A (en) * 1997-08-27 2000-05-30 Nippon Dom Co., Ltd. Woven security label
ES2147473A1 (en) * 1996-05-09 2000-09-01 Customer Service S L Marking system with origin identification elements
WO2000073559A1 (en) * 1999-05-29 2000-12-07 Textilma Ag Method of producing labels with an invisible barcode on a weaving machine and label produced using such a method
WO2002082383A2 (en) * 2000-12-05 2002-10-17 Ambalux Corporation Detection method and apparatus
EP1533406A1 (en) * 2003-11-21 2005-05-25 Sulzer Markets and Technology AG Method for producing a fabric and inspection method for verifying the authenticity of the fabric
US7427025B2 (en) 2005-07-08 2008-09-23 Lockheed Marlin Corp. Automated postal voting system and method
US7937332B2 (en) 2004-12-08 2011-05-03 Lockheed Martin Corporation Automatic verification of postal indicia products
US8005764B2 (en) 2004-12-08 2011-08-23 Lockheed Martin Corporation Automatic verification of postal indicia products
US8085980B2 (en) 2008-08-13 2011-12-27 Lockheed Martin Corporation Mail piece identification using bin independent attributes
US8171567B1 (en) 2002-09-04 2012-05-01 Tracer Detection Technology Corp. Authentication method and system
US8209267B2 (en) 2004-12-08 2012-06-26 Lockheed Martin Corporation Automatic revenue protection and adjustment of postal indicia products
US8270603B1 (en) 2000-05-24 2012-09-18 Tracer Detection Technology Corp. Authentication method and system
US20130187368A1 (en) * 2010-10-13 2013-07-25 Autoliv Development Ab Airbag for a vehicle
US9280696B1 (en) 2008-04-23 2016-03-08 Copilot Ventures Fund Iii Llc Authentication method and system
US9363083B1 (en) 2000-05-24 2016-06-07 Copilot Ventures Fund Iii Llc Authentication method and system
WO2016199173A1 (en) * 2015-06-10 2016-12-15 Council Of Scientific & Industrial Research Novel spiropyran based composition and application thereof as security tag

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB423281A (en) * 1934-01-25 1935-01-29 Oskar Camillo Recht Improvements in paper for paper money and other documents and papers of value
FR1588282A (en) * 1968-10-01 1970-04-10
GB1600615A (en) * 1977-10-28 1981-10-21 Plessey Co Ltd Photochromic compounds
EP0169750A1 (en) * 1984-06-22 1986-01-29 Michel Jalon Luminescent security fibres; security documents and other materials containing these fibres
JPS61179399A (en) * 1985-02-05 1986-08-12 Ookurasho Insatsu Kyokucho Papermaking fiber having photochromic substance adhered thereto

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB423281A (en) * 1934-01-25 1935-01-29 Oskar Camillo Recht Improvements in paper for paper money and other documents and papers of value
FR1588282A (en) * 1968-10-01 1970-04-10
GB1600615A (en) * 1977-10-28 1981-10-21 Plessey Co Ltd Photochromic compounds
EP0169750A1 (en) * 1984-06-22 1986-01-29 Michel Jalon Luminescent security fibres; security documents and other materials containing these fibres
JPS61179399A (en) * 1985-02-05 1986-08-12 Ookurasho Insatsu Kyokucho Papermaking fiber having photochromic substance adhered thereto

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WPIL FILE SUPPLIER, no. 86-249926/38, Derwent Publications Ltd, London, GB; & JP-A61 179 399 (OKURASHO INSATSU KY) 12-08-1986 *

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0488902A1 (en) * 1990-11-29 1992-06-03 Arjo Wiggins S.A. Security document including a security element having photochromic properties
FR2669948A1 (en) * 1990-11-29 1992-06-05 Arjomari Europ Security document with a security element having photochromic properties.
US5289547A (en) * 1991-12-06 1994-02-22 Ppg Industries, Inc. Authenticating method
EP0621574A1 (en) * 1993-04-19 1994-10-26 Nakamura Label Co. Ltd. Forgery-preventing textured or printed emblem
US5592561A (en) * 1994-04-14 1997-01-07 Moore; Lewis J. Anti-counterfeiting system
WO1995033094A1 (en) * 1994-05-31 1995-12-07 I.L.C. Del Dotto S.R.L. Safety yarn and process for its manufacture
GB2306438A (en) * 1995-10-26 1997-05-07 Nakamura Label Inc Forgery-preventing label
GB2306438B (en) * 1995-10-26 1997-09-17 Nakamura Label Inc Forgery-preventing textured emblem
US5824393A (en) * 1995-10-26 1998-10-20 Nakamura Label Inc. Forgery-preventing textured emblem
EP0798415A3 (en) * 1996-02-10 1998-06-03 Hueck Folien GmbH & Co. KG Flat textile element
ES2147473A1 (en) * 1996-05-09 2000-09-01 Customer Service S L Marking system with origin identification elements
US6068895A (en) * 1997-08-27 2000-05-30 Nippon Dom Co., Ltd. Woven security label
WO1999014416A1 (en) * 1997-09-12 1999-03-25 Nocopi Technologies, Inc. Authenticating a textile product
US5941572A (en) * 1997-09-12 1999-08-24 Nocopi Technologies, Inc. Method for authenticating a textile product and a thread and a woven label usable therewith
EP1019574A1 (en) * 1997-09-12 2000-07-19 Nocopi Technologies, Inc. Authenticating a textile product
EP1019574A4 (en) * 1997-09-12 2003-01-02 Nocopi Int Inc Authenticating a textile product
EP0919650A1 (en) * 1997-11-29 1999-06-02 Rinke Etiketten Karl Rinke GmbH & Co. KG Woven strip, particularly label strip, and method of manufacturing and using the same
WO2000073559A1 (en) * 1999-05-29 2000-12-07 Textilma Ag Method of producing labels with an invisible barcode on a weaving machine and label produced using such a method
US6764970B1 (en) 1999-05-29 2004-07-20 Textilma Ag Woven labels with an invisible bar code
US8270603B1 (en) 2000-05-24 2012-09-18 Tracer Detection Technology Corp. Authentication method and system
US9811671B1 (en) 2000-05-24 2017-11-07 Copilot Ventures Fund Iii Llc Authentication method and system
US9363083B1 (en) 2000-05-24 2016-06-07 Copilot Ventures Fund Iii Llc Authentication method and system
WO2002082383A2 (en) * 2000-12-05 2002-10-17 Ambalux Corporation Detection method and apparatus
WO2002082383A3 (en) * 2000-12-05 2004-04-01 Ambalux Corp Detection method and apparatus
US8886946B1 (en) 2002-09-04 2014-11-11 Copilot Ventures Fund Iii Llc Authentication method and system
US9818249B1 (en) 2002-09-04 2017-11-14 Copilot Ventures Fund Iii Llc Authentication method and system
US8171567B1 (en) 2002-09-04 2012-05-01 Tracer Detection Technology Corp. Authentication method and system
EP1533406A1 (en) * 2003-11-21 2005-05-25 Sulzer Markets and Technology AG Method for producing a fabric and inspection method for verifying the authenticity of the fabric
US8209267B2 (en) 2004-12-08 2012-06-26 Lockheed Martin Corporation Automatic revenue protection and adjustment of postal indicia products
US7937332B2 (en) 2004-12-08 2011-05-03 Lockheed Martin Corporation Automatic verification of postal indicia products
US8005764B2 (en) 2004-12-08 2011-08-23 Lockheed Martin Corporation Automatic verification of postal indicia products
US7427025B2 (en) 2005-07-08 2008-09-23 Lockheed Marlin Corp. Automated postal voting system and method
US9846814B1 (en) 2008-04-23 2017-12-19 Copilot Ventures Fund Iii Llc Authentication method and system
US9280696B1 (en) 2008-04-23 2016-03-08 Copilot Ventures Fund Iii Llc Authentication method and system
US8085980B2 (en) 2008-08-13 2011-12-27 Lockheed Martin Corporation Mail piece identification using bin independent attributes
US20130187368A1 (en) * 2010-10-13 2013-07-25 Autoliv Development Ab Airbag for a vehicle
US8770622B2 (en) * 2010-10-13 2014-07-08 Autoliv Development Ab Airbag for a vehicle
WO2016199173A1 (en) * 2015-06-10 2016-12-15 Council Of Scientific & Industrial Research Novel spiropyran based composition and application thereof as security tag

Also Published As

Publication number Publication date Type
GB8802590D0 (en) 1988-03-02 grant

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