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LastUpdate Última actualización 01/08/2025 [07:16:00]
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Solicitudes publicadas en los últimos 60 dias/ Patent applications published in the last 60 days
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AUTHENTICATION DEVICE

NºPublicación:  WO2025133544A1 26/06/2025
Solicitante: 
CRIME SCIENCE TECH [FR]
CRIME SCIENCE TECHNOLOGY
FR_3157592_PA

Resumen de: WO2025133544A1

The invention relates to an authentication device (1) for an information carrier (2) configured to encapsulate at least one datum relating to a product or a person, wherein the authentication device (1) comprises a zone, referred to as the authentication zone (4), wherein the authentication zone (4) comprises at least one layer (7) provided with the information carrier (2) and an optically variable element (6) that displays a variation between a first appearance and a second appearance such that, in a first state, the authentication zone (4) and/or the information carrier (2) displays the first appearance and, in a second state, the authentication zone (4) and/or the information carrier (2) displays the second appearance, wherein the transition between the first appearance and the second appearance is caused by a variation in the viewing angle, or the lighting, or a physico-chemical stimulus.

METHODS OF MANUFACTURING SECURITY DOCUMENTS AND SECURITY DEVICES

NºPublicación:  EP4574442A2 25/06/2025
Solicitante: 
DE LA RUE INT LTD [GB]
De La Rue International Limited
EP_4574442_A2

Resumen de: EP4574442A2

A method of manufacturing a security document is provided, comprising: providing a polymer substrate having first and second surfaces in the form of a web; and in any order: (c) applying at least one opacifying layer to the first and/or second surfaces of the polymer substrate in the form of a web, the or each opacifying layer comprising a non-transparent material; and optionally either: (a) applying an array of focussing elements to the first surface of the polymer substrate in the form of a web across a first region; or (b) applying an image array to the polymer substrate in the form of a web in the first region, such that the image array is located in a plane spaced from the array of focussing elements by a distance substantially equal to the focal length of the focussing elements whereby the focussing elements exhibit a substantially focussed image of the image array; and then (q) cutting the web into sheets in the direction of web transit, then performing on the sheets whichever of steps (a) and/or (b) was not performed on the web, in at least one sheet-fed process; such that either the image array is located between the array of focussing elements and the at least one opacifying layer on the first surface of the substrate, or at least the opacifying layer(s) on the first surface of the substrate define a gap forming a window region in which at least part of the array of focussing elements is disposed such that a substantially focussed image of at least part of the image

MICRO-OPTIC SECURITY DEVICE WITH PHASE ALIGNED IMAGE LAYERS

NºPublicación:  EP4574438A1 25/06/2025
Solicitante: 
CRANE & CO INC [US]
Crane & Co., Inc
EP_4574438_PA

Resumen de: EP4574438A1

A micro-optic security device (105) includes a planar array of microlenses (305), which are configured to focus light along a plurality of focal paths (610) associated with a viewing angle. The micro-optic security device further includes an icon layer stack (905) disposed along the plurality of focal paths. The icon layer stack includes a first icon layer (620) with volumes of cured material of a first color (613b) and volumes of substantially transparent material at locations outside of focal paths of the first range of viewing angles. The icon layer stack also includes a second icon layer (640) with volumes of substantially transparent cured material at locations along focal paths of the first range of viewing angles, and volumes of cured material of a second color (637a) at locations along focal paths of a second range of viewing angles.

Fluorescent Aggregates of Poly(Cyclohexylene Dimethylene Terephthalate), Method for Obtaining Same, and Use Thereof as a Physically Unclonable Label for Identifying and/or Tracing Packaging for Cosmetic and/or Perfume Products

NºPublicación:  US2025197716A1 19/06/2025
Solicitante: 
CONSEJO SUPERIOR DE INVESTIG CIENTIFICAS CSIC [ES]
INENTIA ARO S L [ES]
CONSEJO SUPERIOR DE INVESTIGACIONES CIENT\u00CDFICAS (CSIC),
INENTIA AR\u00D4, S.L
US_2025197716_A1

Resumen de: US2025197716A1

Spherical aggregates of semi-crystalline thermoplastic polyester, poly(cyclohexylene dimethylene terephthalate), with a size distribution of between 160 nm and 200 nm fluorescence in the visible spectrum and are deposited on a thermoplastic aromatic polyester substrate or a thermoplastic polyolefin. The aggregates may be used as a physically unclonable label, for identifying and/or tracing packaging for cosmetic products and/or perfumes. Therefore, the aggregates provide a benefit within the field of anti-counterfeit packaging, particularly in the area of anti-counterfeit packaging for cosmetic and/or perfume products.

A SEALING MARK, A PACKAGE AND METHODS

NºPublicación:  US2025196525A1 19/06/2025
Solicitante: 
JUSTRULE I P B V [NL]
JustRule I.P. B.V
NL_2035811_A

Resumen de: US2025196525A1

The invention relates to a sealing mark for sealing a package such as for packing medicaments. The sealing mark has a sealing layer and a hologram layer that at least partly covers the sealing layer. The sealing mark further comprises a thermosensitive layer that at least partly covers the hologram layer and/or the sealing layer. The thermosensitive layer includes thermochromic ink. The thermochromic ink is irreversible.

METHOD FOR CREATING A DIGITAL TAG FOR MARKING ARTICLES

NºPublicación:  WO2025127961A1 19/06/2025
Solicitante: 
FEDERALNOE GOSUDARSTVENNOE AVTONOMNOE OBRAZOVATELNOE UCHREZHDENIE VYSSHEGO OBRAZOVANIIA NOVOSIBIRSKI [RU]
\u0424\u0415\u0414\u0415\u0420\u0410\u041B\u042C\u041D\u041E\u0415 \u0413\u041E\u0421\u0423\u0414\u0410\u0420\u0421\u0422\u0412\u0415\u041D\u041D\u041E\u0415 \u0410\u0412\u0422\u041E\u041D\u041E\u041C\u041D\u041E\u0415 \u041E\u0411\u0420\u0410\u0417\u041E\u0412\u0410\u0422\u0415\u041B\u042C\u041D\u041E\u0415 \u0423\u0427\u0420\u0415\u0416\u0414\u0415\u041D\u0418\u0415 \u0412\u042B\u0421\u0428\u0415\u0413\u041E \u041E\u0411\u0420\u0410\u0417\u041E\u0412\u0410\u041D\u0418\u042F \"\u041D\u041E\u0412\u041E\u0421\u0418\u0411\u0418\u0420\u0421\u041A\u0418\u0419 \u041D\u0410\u0426\u0418\u041E\u041D\u0410\u041B\u042C\u041D\u042B\u0419 \u0418\u0421\u0421\u041B\u0415\u0414\u041E\u0412\u0410\u0422\u0415\u041B\u042C\u0421\u041A\u0418\u0419 \u0413\u041E\u0421\u0423\u0414\u0410\u0420\u0421\u0422\u0412\u0415\u041D\u041D\u042B\u0419 \u0423\u041D\u0418\u0412\u0415\u0420\u0421\u0418\u0422\u0415\u0422\"

Resumen de: WO2025127961A1

In a method for creating a digital tag for the security marking of articles, a sequence of dots is applied to an article using a luminescent dye, the resulting tag is exposed to ultraviolet light having a wavelength of 250-400 nm, the tag is read using a digital photographic camera, and the obtained image is processed. For each dot of the tag, a luminescence spectrum is obtained consisting of four bands, each of which is correlated with a whole number from 0 to 255 according to the intensity thereof. Half of the dots form a QR code in a horizontal direction, where the dots are correlated with whole numbers and a green component of an RGB code is produced, and the other half of the dots form the QR code in a vertical direction, with a red component of the RGB code being produced. Upon formation of the coloured QR code, each of the dots thereof is situated at the intersection of two components of the RGB code and contains a colour code, where each component contains from 0 to 255 dots: R is from 0 to 255, G is from 0 to 255, and B is equal to 0. The technical result of the invention consists in providing more reliable protection of a product against counterfeit.

METHOD FOR PRODUCING VALUE DOCUMENTS, AND SENSOR SYSTEM FOR QUALITY CONTROL DURING THE PRODUCTION OF VALUE DOCUMENTS

NºPublicación:  US2025201047A1 19/06/2025
Solicitante: 
GIESECKE DEVRIENT CURRENCY TECH GMBH [DE]
GIESECKE+DEVRIENT CURRENCY TECHNOLOGY GMBH
DE_102022000932_PA

Resumen de: US2025201047A1

A method for producing value documents and a sensor system for quality control during the production of value documents, wherein a first optical radiation emanating from a first semi-finished product is captured with a first sensitivity and a first resolution and is tested on the basis of a first test criterion. If the first test criterion is satisfied, the following steps are carried out: introducing and/or applying at least one feature substance into and/or onto the first semifinished product, wherein a value document or a second semifinished product is obtained; capturing a second optical radiation emanating from the value document or the second semifinished product with at least one second sensitivity and at least one second resolution; and testing the second optical radiation on the basis of at least one second test criterion.

DATA CARRIER WITH MACHINE-READABLE SECURITY FEATURE, PRODUCTION METHOD AND AUTHENTICITY CHECK METHOD

NºPublicación:  AU2024212108A1 19/06/2025
Solicitante: 
GIESECKE DEVRIENT CURRENCY TECH GMBH
GIESECKE+DEVRIENT CURRENCY TECHNOLOGY GMBH
AU_2024212108_PA

Resumen de: WO2024156314A1

The invention relates to a data carrier (10), in particular a value or security document, having a substrate (20) which comprises at least one transparent plastics layer and two opposing main surfaces. The data carrier additionally contains two opaque-white layers (22, 32) having a white, opaque appearance, which are applied to the opposing main surfaces of the substrate (20). Each of the opaque-white layers (22, 32) consists of a layer sequence of two or more partial layers (24a-c, 34a-c) extending from a lowermost white layer (24a, 34a) to an uppermost white layer (24c, 34c). The data carrier also contains a machine-readable security feature which comprises a machine-readable feature substance (38) which is present in at least one of the partial layers (24c) of at least one of the opaque-white layers (22, 32).

DATA SHEET FOR INCORPORATING INTO A SECURITY DOCUMENT AND/OR DOCUMENT OF VALUE, PREPARATION PROCESSES, AND ASSOCIATED SECURITY DOCUMENT AND/OR DOCUMENT OF VALUE

NºPublicación:  WO2025127952A1 19/06/2025
Solicitante: 
IMPRENSA NAC - CASA DA MOEDA SA [PT]
PIEP ASSOCIACAO - POLO DE INOVACAO EM ENGENHARIA DE POLIMEROS [PT]
IMPRENSA NACIONAL - CASA DA MOEDA, SA,
PIEP ASSOCIA\u00C7\u00C3O - POLO DE INOVA\u00C7\u00C3O EM ENGENHARIA DE POL\u00CDMEROS

Resumen de: WO2025127952A1

The present invention relates to a data sheet (10) for incorporation into a security document and/or document of value, for example a booklet, comprising a flexible spine layer (1) and at least one first flexible layer (2) and/or a second flexible layer (2a); wherein a portion of said layers (2, 2a) is connected to a portion of the first surface of the flexible spine layer (1), which comprises at least one copolymer selected from the group consisting of a styrene copolymer or an acrylic copolymer. The flexible spine layer (1) exhibits suitable dimensional stability, tensile strength and yield strength for complying with the specifications of security document manufacturing processes based on lamination at high temperatures and pressures. In addition, the flexible spine layer (1) includes level 2 security particles (5), which make the material much safer against counterfeiting and replication.

TINTAS DE SEGURIDAD Y CARACTERÍSTICAS DE SEGURIDAD LEGIBLES POR MÁQUINA

NºPublicación:  AR132345A1 18/06/2025
Solicitante: 
SICPA HOLDING SA [CH]
SICPA HOLDING SA
TW_202442814_PA

Resumen de: TW202442814A

The present invention relates to the field of security inks suitable for printing machine readable security features on substrate. security documents or articles as well as machine readable security feature made from said security inks. and security documents comprising a machine readable security feature made from said security inks. In particular. the invention provides security inks comprising one or more IR absorbing materials wherein said security ink allows the production of a machine readable security feature.

DUAL INFRARED GLOSS EFFECT

NºPublicación:  EP4572303A1 18/06/2025
Solicitante: 
XEROX CORP [US]
Xerox Corporation
EP_4572303_PA

Resumen de: EP4572303A1

A method, system and apparatus for rendering a gloss effect on a recording medium, can involve rendering a foreground pattern using a first ink composition comprising infrared absorbing colors, wherein said first ink is lightened with lightening parameters by the addition of paper white holes and rendering a background pattern using a second ink composition comprising a process or spot color, wherein said second ink is darkened with darkening parameters by the addition of infrared absorbing colors that have different amounts of infrared absorbing colors than that of the first ink composition. The lightening parameters and the darkening parameters are adjustable to ensure that the first and second inks appear approximately the same at printed sizes. Anisotropic properties can be introduced to the first and second inks, causing non-uniformity in their reflection of light in different directions when viewed under a light source, thereby creating a gloss effect renderable on a recording medium. An infrared (IR) signal can be embedded within the gloss effect to enable detection of the gloss effect using an IR sensor or an IR device.

DATA CARRIER WITH MOTIF IMAGES WHICH ARE VISIBLE FROM OPPOSITE FACES, AND CORRESPONDING PRODUCTION METHOD

NºPublicación:  US2025187361A1 12/06/2025
Solicitante: 
VERIDOS GMBH [DE]
Veridos GmbH
US_2025187361_A1

Resumen de: US2025187361A1

The invention relates to a data carrier (10) with two different motif images which are visible from opposite faces of the data carrier, namely a front-side motif (22) and a back-side motif (32). According to the invention, it is provided that the data carrier (10) has a multi-layer structure with an upper motif layer (52), a lower motif layer (62) and an intermediate layer (40) arranged between the motif layers (52, 62) and which is at least partially translucent. It is further provided that a partial motif (22A, 22B) of the front-side motif (22) is arranged in the upper and lower motif layers (52, 62) and the two partial motifs (22A, 22B) complement each other to form the front-side motif (22) when the data carrier is viewed from the front and/or respectively one partial motif (32A, 32B) of the back-side motif (32) is arranged in the upper and lower motif layers (52, 62) and the two partial motifs (32A, 32B) complement each other to form the back-side motif when the data carrier is viewed from the back and that the upper and lower motif layers (52, 62) are each formed by a laser-modified printing ink, the motif information of which, produced by laser exposure and forming the front-side motif (22) and the back-side motif (32), is only visible when viewed in reflected light, but not when viewed in transmitted light.

METHODS FOR PRODUCING OPTICAL EFFECT LAYERS COMPRISING MAGNETIC OR MAGNETIZABLE PIGMENT PARTICLES AND EXHIBITING ONE OR MORE INDICIA

NºPublicación:  US2025187036A1 12/06/2025
Solicitante: 
SICPA HOLDING SA [CH]
SICPA HOLDING SA
US_2025187036_A1

Resumen de: US2025187036A1

The invention relates to the field of the protection of security documents such as for example banknotes and identity documents against counterfeit and illegal reproduction. In particular, the present invention provides methods for producing optical effect layers (OELs) exhibiting one or more indicia (×30) on a substrate (×20), said method comprising a step of exposing a coating layer (×10) comprising non-spherical magnetic or magnetizable pigment particles to a magnetic field of a magnetic-field generating device so as to orient at least a part of the magnetic or magnetizable pigment particles; a step of applying a top coating composition on top of the coating layer (×10) and in the form of one or more indicia (×30), and a step of at least partially curing the coating layer (×10) and the one or more indicia (×30) with a curing unit (×50).

RYLENE-BASED UV CURABLE SECURITY INK COMPOSITIONS

NºPublicación:  AU2023374712A1 12/06/2025
Solicitante: 
SICPA HOLDING SA
SICPA HOLDING SA
AU_2023374712_PA

Resumen de: AU2023374712A1

The invention relates to the field of UV curable security ink compositions comprising rylene-based compounds, radically curable monomers, oligomers or mixtures thereof, and radical photoinitiators. The invention further relates to security features obtained by applying or printing the security ink compositions, articles or documents containing said security features and method of preparing the security features comprising the UV curable security ink compositions.

SMART AND SECURE LABEL STOCK

NºPublicación:  US2025187360A1 12/06/2025
Solicitante: 
AGARWAL ARUN [IN]
AGARWAL SONIA [IN]
AGARWAL ARUN,
AGARWAL SONIA
US_2025187360_A1

Resumen de: US2025187360A1

The present invention relates to a smart and secure label stock with security features. The present invention relates to a label stock produced from a substrate utilizing adhesive and liner materials and having a plurality of security features on the rear side of the substrate made using specialized inks and various authentication features for different applications.

PHOTOLUMINESCENT SECURITY INK FOR CONTINOUS INK-JET PRINTING

NºPublicación:  US2025188300A1 12/06/2025
Solicitante: 
SICPA HOLDING SA [CH]
SICPA HOLDING SA
US_2025188300_A1

Resumen de: US2025188300A1

The present invention provides a photoluminescent security ink for continuous ink-jet printing, wherein said ink has a viscosity of about 1.5 mPas to about 6 mPas at 25° C., and comprises: a) from about 4 wt-% to about 6 wt-% of uncapped NaX1-y-zF4YbyZz nanoparticles; b) from about 1.5 wt-% to about 10 wt-% of a dispersing agent; c) from about 80 wt-% to about 90 wt-% of an organic solvent; and d) from about 0.1 wt-% to about 1 wt-% of a conductive salt, as well as a process for producing said ink, and a process for manufacturing a photoluminescent security feature on an article, or a value document, with said ink.

FOLHA DE DADOS PARA INCORPORAÇÃO NUM DOCUMENTO DE SEGURANÇA E/OU DE VALOR, PROCESSOS DE PREPARAÇÃO E DOCUMENTO DE SEGURANÇA E/OU DE VALOR ASSOCIADOS

NºPublicación:  PT119129A 12/06/2025
Solicitante: 
IMPRENSA NAC CASA DA MOEDA SA [PT]
PIEP ASSOCIACAO POLO DE INOVACAO EM ENGENHARIA DE POLIMEROS [PT]
IMPRENSA NACIONAL - CASA DA MOEDA, SA,
PIEP ASSOCIA\u00C7\u00C3O - POLO DE INOVA\u00C7\u00C3O EM ENGENHARIA DE POL\u00CDMEROS
PT_119129_A

Resumen de: WO2025127952A1

The present invention relates to a data sheet (10) for incorporation into a security document and/or document of value, for example a booklet, comprising a flexible spine layer (1) and at least one first flexible layer (2) and/or a second flexible layer (2a); wherein a portion of said layers (2, 2a) is connected to a portion of the first surface of the flexible spine layer (1), which comprises at least one copolymer selected from the group consisting of a styrene copolymer or an acrylic copolymer. The flexible spine layer (1) exhibits suitable dimensional stability, tensile strength and yield strength for complying with the specifications of security document manufacturing processes based on lamination at high temperatures and pressures. In addition, the flexible spine layer (1) includes level 2 security particles (5), which make the material much safer against counterfeiting and replication.

SECURITY ELEMENT FOR A VALUE DOCUMENT, HAVING A LUMINESCENT SECURITY FEATURE, AND METHOD FOR PRODUCTION THEREOF

NºPublicación:  EP4565433A1 11/06/2025
Solicitante: 
GIESECKE DEVRIENT CURRENCY TECH GMBH [DE]
Giesecke+Devrient Currency Technology GmbH
DE_102022002840_PA

Resumen de: WO2024027882A1

A security element for a value document comprises: a first concealed motif region having a first luminescence layer with at least one first excitation wavelength in the UV-A range; and a second concealed motif region having a second luminescence layer with at least one second excitation wavelength in the UV-A range that is different from the at least one first excitation wavelength.

SECURITY ELEMENT FOR A VALUE DOCUMENT, HAVING AN OPTICALLY VARIABLE PRIMARY SURFACE PATTERN AND CONCEALED SECONDARY SURFACE PATTERN, AND METHOD FOR PRODUCTION THEREOF

NºPublicación:  EP4565432A1 11/06/2025
Solicitante: 
GIESECKE DEVRIENT CURRENCY TECH GMBH [DE]
Giesecke+Devrient Currency Technology GmbH
CN_119654240_PA

Resumen de: CN119654240A

The invention relates to a security element (1) for value documents, said security element (1) comprising: an optically variable main surface pattern (2) comprising a metal layer (4) having a relief structure (4a); and at least one hidden secondary surface pattern (3), which comprises a plurality of elements (6) perforated on the metal layer (4) and at least one light-emitting layer (7), which is arranged at least in the region of the secondary surface pattern (3).

SYSTEMS AND METHODS FOR THE GENERATION AND USAGE OF AUTHENTICATION IMAGES IN CONJUNCTION WITH LOW-RESOLUTION PRINT DEVICES

NºPublicación:  EP4566043A1 11/06/2025
Solicitante: 
PROOF AUTHENTICATION CORP [US]
Proof Authentication Corporation
US_2024048662_PA

Resumen de: US2024048662A1

Systems and methods applicable, for instance, to the generation and usage of authentication images. In one aspect, unauthorized attempts to duplicate authentication images can be thwarted. In another aspect, there can be provision for authorized authentication image generation using low-resolution print devices.

HINGE FOR SECURITY ARTICLE HAVING IMPROVED SECURITY AND DURABILITY AND FORGERY DETERMINATION METHOD USING SAME

NºPublicación:  WO2025116320A1 05/06/2025
Solicitante: 
KOREA MINTING SECURITY PRINTING & ID CARD OPERATING CORP [KR]
\uD55C\uAD6D\uC870\uD3D0\uACF5\uC0AC
WO_2025116320_PA

Resumen de: WO2025116320A1

The present invention relates to a hinge for a security article and a forgery determination method using the same, the hinge including: a fabric woven with a plurality of wefts and a plurality of warps; and a security element containing a fluorescent substance having a light emitting wavelength when irradiated with excitation light. At least a portion of the fabric includes a special yarn, and the security element includes: a first security element including a security yarn included in at least a portion of the plurality of wefts and warps; a second security element including a security pattern located on the fabric; or a combination thereof. Improving both the durability and security of the hinge has the advantages that chemical and physical damage due to the external environment and man-made damage can be prevented, and the area of contact between a security material harmful to the human body and the body of a person possessing the security material can be significantly reduced.

SYSTEM AND METHOD OF USING PLANCHETTES AND MICROPRINTING TO DETECT UNAUTHORIZED COPYING OR COUNTERFEITING IN ARTICLES OF MANUFACTURE

NºPublicación:  US2025178370A1 05/06/2025
Solicitante: 
THE GOVERNMENT OF THE US SECRETARY OF HOMELAND SECURITY [US]
The Government of the United States of America, as represented by the Secretary of Homeland Security
US_2025178370_PA

Resumen de: US2025178370A1

A security system for an article of manufacture includes: one or more first planchettes included in the article of manufacture and configured to luminesce when a first frequency of light is directed to the one or more first planchettes; and one or more second planchettes included in the article of manufacture and configured to luminesce when a second frequency of light is directed to the one or more second planchettes. The first and second planchettes have one or more first planchette substrates each including a first planchette surface having a first UV-reactive microprinting thereon; and one or more second planchette substrates each including a second planchette surface having a second UV-reactive microprinting thereon. The first UV-reactive microprinting is different from the second UV-reactive microprinting.

Sicherheitselement und Verfahren zum Herstellen eines Sicherheitselements für einen kartenförmigen Datenträger oder ein Wertdokument

NºPublicación:  DE102023134054A1 05/06/2025
Solicitante: 
GIESECKE DEVRIENT EPAYMENTS GMBH [DE]
Giesecke+Devrient ePayments GmbH
DE_102023134054_PA

Resumen de: DE102023134054A1

Die Erfindung betrifft ein Sicherheitselement (1) für einen kartenförmigen Datenträger (2) oder ein Wertdokument (3). Das Sicherheitselement (1) umfasst ein Basissubstrat (10) sowie eine Gewebestruktur (20), die auf das Basissubstrat (10) aufgebracht ist, so dass die Gewebestruktur (20) vollflächig mit dem Basissubstrat (10) verbunden ist. Die Gewebestruktur (20) umfasst auch eine optisch erfassbare Information (21), die in die Gewebestruktur (20) eingebracht oder auf diese aufgebracht ist, um einen optisch erfassbaren Effekt für das Sicherheitselement (1) bereitzustellen. Die Erfindung betrifft ferner ein Verfahren zum Herstellen eines Sicherheitselements (1) für einen kartenförmigen Datenträger (2) oder ein Wertdokument (3).

PRODUCT TAG

NºPublicación:  WO2025111658A1 05/06/2025
Solicitante: 
NUCLEOTRACE PTY LTD [AU]
NUCLEOTRACE PTY. LTD
WO_2025111658_PA

Resumen de: WO2025111658A1

This disclosure relates to a tag comprising an identifier visually representing first information and a mechanism to change the tag from a first state relating to the tag being unaltered where the machine readable identifier is inaccessible to a second state relating to the tag being altered where the machine-readable identifier is accessible. The machine-readable identifier comprises a substance that has a first configuration in the first state of the tag and changes to a second configuration in the second state of the tag. The first information is readable in the first configuration and unreadable in the second configuration.

Optical security element

Nº publicación: GB2635891A 04/06/2025

Solicitante:

IQS GROUP A S [CZ]
IQS Group a.s

GB_2635891_PA

Resumen de: GB2635891A

A method for the manufacture of an optical security element 3 comprises providing a substrate 10 having diffractive optically active relief 20 formed on or applied to a surface (14, Fig.1) thereof; applying to said surface of the substrate a layer of a composition comprising particles of a material having a refractive index different from the refractive index of the material of the substrate, the composition being applied in the form of a sol; drying the applied sol layer to form a xerogel intermediate layer 30 comprising the said different refractive index material; and applying over the xerogel intermediate layer 30 at least one covering layer 40 for protecting the surface optical relief on the substrate against subsequent mechanical damage. The substrate material may have a refractive index in the range of from about 1.4 to about 1.6. The particles may comprise or are composed of a material with a refractive index in the range of from about 1.6 or 1.7 or 1.8 up to about 2.55 or 2.6. The particles may be composed of or comprise an inorganic material being a metal (e.g. aluminium (Al) or copper (Cu) or a metal oxide (e.g. titanium dioxide (TiO2) nanoparticles).

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