Disclosed are devices with dynamic optical properties suitable for use as security or authentication devices, for example for documents or items of importance or value, in order to help prevent counterfeit of the same. Such devices, at least in selected embodiments, enable observation of dynamic changes or moving entities within the device by collective or enhanced imaging of the dynamic changes or moveable entities, the motion or position of which may otherwise be difficult to observe, or indiscernible to, the naked eye.
Authentication protocols that leverage physical unclonable functions (PUF). A PUF's underlying entropy hardness characteristics and Key Encryption Key (KEK) primitive are leveraged to construct the PUF-MAKE protocol that may be used to construct a shared session key. The root-of-trust and strong challenge-response-based authentication and encryption key generation functions of a PUF are leveraged to construct the PEER TRUST protocol that may be used to select trusted devices and to carry out authentication and encryption key generation.
H04L 9/32 - Arrangements for secret or secure communicationsNetwork security protocols including means for verifying the identity or authority of a user of the system
The Governing Council of the University of Toronto (Canada)
Inventor
Macpherson, Charles Douglas
Omrane, Badr
Herman, Peter
Ho, Stephen Paulchi
Malmberg, Sean Magnus
Abstract
Disclosed are optical devices suitable as security devices for document authentication, which comprise at least one two-dimensional array of elongate laser-modified tracks extending within a document substrate that have a distinct optical refractive index compared to the unmodified substrate, which can exhibit excellent diffractive effects. Also disclosed are the use of such devices for document authentication and methods for their production.
B42D 25/435 - Marking by removal of material using electromagnetic radiation, e.g. laser
B23K 26/354 - Working by laser beam, e.g. welding, cutting or boring for surface treatment by melting
B23K 26/359 - Working by laser beam, e.g. welding, cutting or boring for surface treatment by providing a line or line pattern, e.g. a dotted break initiation line
The Governing Council of the University of Toronto (Canada)
Inventor
Macpherson, Charles Douglas
Omrane, Badr
Malmberg, Sean Magnus
Herman, Peter
Ho, Stephen Paulchi
Alimohammadian, Ehsan
Abstract
Disclosed are optical devices suitable as security devices for document authentication, which comprise at least one array of patterns such as laser-fabricated patterns, or other structures, optionally formed for example from elongate laser-modified tracks extending within a document substrate. The patterns are combined with at least one array of microlenses to cause certain optical effects. Also disclosed are the use of such devices for document authentication, and methods for their production.
09 - Scientific and electric apparatus and instruments
36 - Financial, insurance and real estate services
Goods & Services
(1) Programmable, exchangeable digital currency; programmable, exchangeable digital currency wallet; exchangeable central bank digital currency; portable, exchangeable digital currency (1) Issuance and distribution of digital currency; exchange of central bank digital currency asset from one entity to another; conversion to and from other forms of money; online platform for maintaining and using technology for financial transactions; offline platform for maintaining and using technology for financial transactions
09 - Scientific and electric apparatus and instruments
36 - Financial, insurance and real estate services
Goods & Services
(1) Programmable, exchangeable digital currency; programmable, exchangeable digital currency wallet; exchangeable central bank digital currency; portable, exchangeable digital currency (1) Issuance and distribution of digital currency; exchange of central bank digital currency asset from one entity to another; conversion to and from other forms of money; online platform for maintaining and using technology for financial transactions; offline platform for maintaining and using technology for financial transactions
09 - Scientific and electric apparatus and instruments
36 - Financial, insurance and real estate services
Goods & Services
(1) Programmable, exchangeable digital currency; programmable, exchangeable digital currency wallet; exchangeable central bank digital currency; portable, exchangeable digital currency (1) Issuance and distribution of digital currency; exchange of central bank digital currency asset from one entity to another; conversion to and from other forms of money; online platform for maintaining and using technology for financial transactions; offline platform for maintaining and using technology for financial transactions
09 - Scientific and electric apparatus and instruments
36 - Financial, insurance and real estate services
Goods & Services
(1) Programmable, exchangeable digital currency; programmable, exchangeable digital currency wallet; exchangeable central bank digital currency; portable, exchangeable digital currency (1) Issuance and distribution of digital currency; exchange of central bank digital currency asset from one entity to another; conversion to and from other forms of money; online platform for maintaining and using technology for financial transactions; offline platform for maintaining and using technology for financial transactions
17.
DYNAMIC MICRO-OPTIC SECURITY DEVICES, THEIR PRODUCTION AND USE
Disclosed are devices with dynamic optical properties suitable for use as security or authentication devices, for example for documents or items of importance or value, in order to help prevent counterfeit of the same. Such devices, at least in selected embodiments, enable observation of dynamic changes or moving entities within the device by collective or enhanced imaging of the dynamic changes or moveable entities, the motion or position of which may otherwise be difficult to observe, or indiscernible to, the naked eye.
The Governing Council of the University of Toronto (Canada)
Inventor
Macpherson, Charles Douglas
Omrane, Badr
Herman, Peter
Ho, Stephen
Malmberg, Sean Magnus
Abstract
Disclosed are optical devices suitable as security devices for document authentication, which comprise at least one two-dimensional array of elongate laser-modified tracks extending within a document substrate that have a distinct optical refractive index compared to the unmodified substrate, which can exhibit excellent diffractive effects. Also disclosed are the use of such devices for document authentication and methods for their production.
B23K 26/354 - Working by laser beam, e.g. welding, cutting or boring for surface treatment by melting
B23K 26/359 - Working by laser beam, e.g. welding, cutting or boring for surface treatment by providing a line or line pattern, e.g. a dotted break initiation line
B42D 25/435 - Marking by removal of material using electromagnetic radiation, e.g. laser
THE GOVERNING COUNCIL OF THE UNIVERSITY OF TORONTO (Canada)
Inventor
Macpherson, Charles Douglas
Omrane, Badr
Malmberg, Sean Magnus
Herman, Peter
Ho, Stephen Paulchi
Alimohammadian, Ehsan
Abstract
Disclosed are optical devices suitable as security devices for document authentication, which comprise at least one array of patterns such as laser‐fabricated patterns, or other structures, optionally formed for example from elongate laser‐modified tracks extending within a document substrate. The patterns are combined with at least one array of microlenses to cause certain optical effects. Also disclosed are the use of such devices for document authentication, and methods for their production.
B42D 25/351 - Translucent or partly translucent parts, e.g. windows
G02B 1/04 - Optical elements characterised by the material of which they are madeOptical coatings for optical elements made of organic materials, e.g. plastics
A security device that exhibits at least one dynamic response upon change of orientation of the security device with respect to gravity, wherein the security device includes a hollow capsule completely filled with a liquid and one or more microscopic elements. In addition, the dynamic response continues after cessation of the change of orientation with respect to gravity. The dynamic response includes a transition of the one or more microscopic elements from substantial mechanical equilibrium to non-equilibrium upon action of the change of orientation with respect to gravity and back to substantial mechanical equilibrium after cessation of the change of orientation with respect to gravity. During the dynamic response, the one or more microscopic elements undergo at least one of a rotational motion and a translational motion relative to the liquid.
G02F 1/01 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour
G02B 26/02 - Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
G02B 1/00 - Optical elements characterised by the material of which they are madeOptical coatings for optical elements
G02F 1/17 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour based on variable-absorption elements not provided for in groups
21.
Security display devices, their production and use
Security documents often incorporate security devices to prevent or hinder counterfeiters. Disclosed herein are security devices that include a fluid or fluids within the devices. Such devices, and security documents that include them, afford new techniques to check whether a security document is a legitimate or counterfeit copy.
THE GOVERNING COUNCIL OF THE UNIVERSITY OF TORONTO (Canada)
Inventor
Macpherson, Charles Douglas
Omrane, Badr
Herman, Peter
Ho, Stephen Paulchi
Malmberg, Sean Magnus
Abstract
Disclosed are optical devices suitable as security devices for document authentication, which comprise at least one two-dimensional array of elongate laser-modified tracks extending within a document substrate that have a distinct optical refractive index compared to the unmodified substrate, which can exhibit excellent diffractive effects. Also disclosed are the use of such devices for document authentication and methods for their production.
Security documents often incorporate security devices to prevent or hinder counterfeiters. Disclosed herein are security devices that include a fluid or fluids within the devices. Such devices, and security documents that include them, afford new techniques to check whether a security document is a legitimate or counterfeit copy.
A security device that elicits at least one dynamic response upon acceleration, or upon change of orientation with respect to gravity, wherein the dynamic response continues after cessation of the acceleration or the change of orientation. In addition, the dynamic response can be optical, such that it is visually observable by an unaided human eye. Alternatively, the response can be machine readable. In some cases, the dynamic response has duration of from about 0.01 s to about 100 s, or from about Is to about 10 s.
G02B 26/00 - Optical devices or arrangements for the control of light using movable or deformable optical elements
G02B 26/02 - Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
G02B 1/00 - Optical elements characterised by the material of which they are madeOptical coatings for optical elements
B82Y 20/00 - Nanooptics, e.g. quantum optics or photonic crystals
B82B 1/00 - Nanostructures formed by manipulation of individual atoms or molecules, or limited collections of atoms or molecules as discrete units
B42D 25/36 - Identification or security features, e.g. for preventing forgery comprising special materials
G02F 1/01 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour
G02F 1/17 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour based on variable-absorption elements not provided for in groups
29.
Alignment and rotation of Janus microparticles in response to acceleration
Gravitational Janus microparticle having, a center-of-mass, a center-of-volume, and a non¬uniform density, wherein: the center-of-mass and the center-of-volume are distinct. When suspended in a fluid, the microparticle substantially aligns with either: i) the gravitational field; or ii) the direction of an acceleration, such that the Janus microparticle is in substantial rotation equilibrium. After perturbation from substantial rotational equilibrium, the Janus microparticle reversibly rotates to return to substantial rotational equilibrium. The gravitational Janus microparticle may comprise at least two portions, each having distinct physical and/or chemical characteristics, wherein at least one portion provides a detectable effect following rotation and alignment of the microparticle.
G02B 26/00 - Optical devices or arrangements for the control of light using movable or deformable optical elements
G02B 26/08 - Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
G02F 1/29 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the position or the direction of light beams, i.e. deflection
G02B 26/02 - Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
G02B 1/00 - Optical elements characterised by the material of which they are madeOptical coatings for optical elements
B82B 1/00 - Nanostructures formed by manipulation of individual atoms or molecules, or limited collections of atoms or molecules as discrete units
B42D 25/36 - Identification or security features, e.g. for preventing forgery comprising special materials
G02F 1/01 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour
G02F 1/167 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
G02F 1/17 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour based on variable-absorption elements not provided for in groups
30.
10 CANADA SIR JOHN A. MACDONALD SIR GEORGE-ÉTIENNE CARTIER AGNÈS MACPHAIL JAMES GLADSTONE AKAY-NA-MUKA BANK OF CANADA/ BANQUE DU CANADA DIX TEN DOLLARS 150 CANADA 1867 2017
Disclosed herein are devices that change their appearance and/or physical properties when under an external influence, and methods for their production and use. Such devices may be used as features of any type of items, documents, billboards, posters, display devices, advertisements and other items etc. and may be adapted to include decipherable content. Such devices also afford new techniques for a user to check quickly and easily whether the item is a legitimate or a counterfeit copy, either by hand-manipulation of the device, or with the assistance of an additional screening tool.
B42D 25/369 - Magnetised or magnetisable materials
B42D 25/36 - Identification or security features, e.g. for preventing forgery comprising special materials
B82Y 20/00 - Nanooptics, e.g. quantum optics or photonic crystals
G02B 26/02 - Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
B42D 25/351 - Translucent or partly translucent parts, e.g. windows
B42D 25/46 - Associating two or more layers using pressure
B42D 25/47 - Associating two or more layers using chemicals or adhesives using adhesives
B42D 25/445 - Marking by removal of material using chemical means, e.g. etching
B32B 5/24 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous one layer being a fibrous or filamentary layer
B32B 7/12 - Interconnection of layers using interposed adhesives or interposed materials with bonding properties
B32B 9/00 - Layered products essentially comprising a particular substance not covered by groups
B32B 27/06 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance
B32B 27/28 - Layered products essentially comprising synthetic resin comprising copolymers of synthetic resins not wholly covered by any one of the following subgroups
G02F 1/01 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour
G02F 1/09 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
D21H 21/48 - Elements suited for physical verification, e.g. by irradiation
G02F 1/167 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
G07D 7/005 - Testing security markings invisible to the naked eye, e.g. verifying thickened lines or unobtrusive markings or alterations
39.
Optically variable devices, their production and use
Disclosed herein are devices that change their appearance and/or physical properties when under an external influence, and methods for their production and use. Such devices may be used as features of any type of items, documents, billboards, posters, display devices, advertisements and other items etc. and may be adapted to include decipherable content. Such devices also afford new techniques for a user to check quickly and easily whether the item is a legitimate or a counterfeit copy, either by hand-manipulation of the device, or with the assistance of an additional screening tool.
B42D 25/369 - Magnetised or magnetisable materials
B42D 25/36 - Identification or security features, e.g. for preventing forgery comprising special materials
B82Y 20/00 - Nanooptics, e.g. quantum optics or photonic crystals
G02B 26/02 - Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
B42D 25/351 - Translucent or partly translucent parts, e.g. windows
B42D 25/46 - Associating two or more layers using pressure
B42D 25/47 - Associating two or more layers using chemicals or adhesives using adhesives
B42D 25/445 - Marking by removal of material using chemical means, e.g. etching
B32B 5/24 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous one layer being a fibrous or filamentary layer
B32B 7/12 - Interconnection of layers using interposed adhesives or interposed materials with bonding properties
B32B 9/00 - Layered products essentially comprising a particular substance not covered by groups
B32B 27/06 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance
B32B 27/28 - Layered products essentially comprising synthetic resin comprising copolymers of synthetic resins not wholly covered by any one of the following subgroups
G02F 1/01 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour
G02F 1/09 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
D21H 21/48 - Elements suited for physical verification, e.g. by irradiation
G02F 1/167 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
G07D 7/005 - Testing security markings invisible to the naked eye, e.g. verifying thickened lines or unobtrusive markings or alterations
A security device that elicits at least one dynamic response upon acceleration, or upon change of orientation with respect to gravity, wherein the dynamic response continues after cessation of the acceleration or the change of orientation. In addition, the dynamic response can be optical, such that it is visually observable by an unaided human eye. Alternatively, the response can be machine readable. In some cases, the dynamic response has duration of from about 0.01 s to about 100 s, or from about Is to about 10s.
Gravitational Janus microparticle having, a center-of-mass, a center-of-volume, and a non-uniform density, wherein: the center-of-mass and the center-of-volume are distinct. When suspended in a fluid, the microparticle substantially aligns with either: i) the gravitational field; or ii) the direction of an acceleration, such that the Janus microparticle is in substantial rotation equilibrium. After perturbation from substantial rotational equilibrium, the Janus microparticle reversibly rotates to return to substantial rotational equilibrium. The gravitational Janus microparticle may comprise at least two portions, each having distinct physical and/or chemical characteristics, wherein at least one portion provides a detectable effect following rotation and alignment of the microparticle.
G02B 26/02 - Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
B42D 25/36 - Identification or security features, e.g. for preventing forgery comprising special materials
16 - Paper, cardboard and goods made from these materials
36 - Financial, insurance and real estate services
Goods & Services
(1) Currency, bank notes (1) Issuance and distribution of currency; issuance and distribution of bank notes; providing information on currency and bank notes
16 - Paper, cardboard and goods made from these materials
36 - Financial, insurance and real estate services
Goods & Services
(1) Currency, bank notes (1) Issuance and distribution of currency; issuance and distribution of bank notes; providing information on currency and bank notes
50.
OPTICALLY VARIABLE DEVICES, THEIR PRODUCTION AND USE
Disclosed herein are devices that change their appearance and / or physical properties when under an external influence, and methods for their production and use. Such devices may be used as features of any type of items, documents, billboards, posters, display devices, advertisements and other items etc. and may be adapted to include decipherable content. Such devices also afford new techniques for a user to check quickly and easily whether the item is a legitimate or a counterfeit copy, either by hand- manipulation of the device, or with the assistance of an additional screening tool.
G02B 26/00 - Optical devices or arrangements for the control of light using movable or deformable optical elements
B42D 25/36 - Identification or security features, e.g. for preventing forgery comprising special materials
B82Y 20/00 - Nanooptics, e.g. quantum optics or photonic crystals
G09F 9/30 - Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
51.
OPTICALLY VARIABLE DEVICES, THEIR PRODUCTION AND USE
Disclosed herein are devices that change their appearance and / or physical properties when under an external influence, and methods for their production and use. Such devices may be used as features of any type of items, documents, billboards, posters, display devices, advertisements and other items etc. and may be adapted to include decipherable content. Such devices also afford new techniques for a user to check quickly and easily whether the item is a legitimate or a counterfeit copy, either by hand- manipulation of the device, or with the assistance of an additional screening tool.
B42D 25/36 - Identification or security features, e.g. for preventing forgery comprising special materials
G02F 1/00 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics
G07D 7/06 - Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
52.
OPTICALLY VARIABLE DEVICES, THEIR PRODUCTION AND USE
Disclosed herein are devices that change their appearance and / or physical properties when under an external influence, and methods for their production and use. Such devices may be used as features of any type of items, documents, billboards, posters, display devices, advertisements and other items etc. and may be adapted to include decipherable content. Such devices also afford new techniques for a user to check quickly and easily whether the item is a legitimate or a counterfeit copy, either by hand- manipulation of the device, or with the assistance of an additional screening tool.
G02B 26/00 - Optical devices or arrangements for the control of light using movable or deformable optical elements
B42D 25/36 - Identification or security features, e.g. for preventing forgery comprising special materials
G02F 1/00 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics
An optical based authentication device that is attachable to a security document having a substrate. The authentication device includes: a piezoelectric material layer for generating an electric field in response to mechanical stress; and an optically responsive layer directly attached to the piezoelectric material layer, the attached layers being absent a direct electrical connection, the optically responsive layer being operable between a first state and a second state having different ocular perceptions. The optically responsive layer changes from the first state to the second state in response the electric field generated by the piezoelectric material layer.
G07F 19/00 - Complete banking systemsCoded card-freed arrangements adapted for dispensing or receiving monies or the like and posting such transactions to existing accounts, e.g. automatic teller machines
G06K 19/06 - Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
H02N 2/18 - Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
Security documents often incorporate security devices to prevent or hinder counterfeiters. Disclosed herein are security devices that include a fluid or fluids within the devices. Such devices, and security documents that include them, afford new techniques to check whether a security document is a legitimate or counterfeit copy.
Security documents often incorporate security devices to prevent or hinder counterfeiters. Disclosed herein are security devices that include a fluid or fluids within the devices. Such devices, and security documents that include them, afford new techniques to check whether a security document is a legitimate or counterfeit copy.
B44F 1/12 - Securities or banknotes as far as the design or protection against forgery is of importance
B42D 15/10 - Identity, credit, cheque or like information-bearing cards (record carriers, e.g. credit or identity cards, for use with machines and with at least a part designed to carry digital markings G06K 19/00)
B81B 1/00 - Devices without movable or flexible elements, e.g. microcapillary devices
B82Y 20/00 - Nanooptics, e.g. quantum optics or photonic crystals
G02F 1/01 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour
G07D 7/12 - Visible light, infrared or ultraviolet radiation
An optical based authentication device that is attachable to a security document having a substrate. The authentication device includes: a piezoelectric material layer for generating an electric field in response to mechanical stress; and an optically responsive layer directly attached to the piezoelectric material layer, the attached layers being absent a direct electrical connection, the optically responsive layer being operable between a first state and a second state having different ocular perceptions. The optically responsive layer changes from the first state to the second state in response the electric field generated by the piezoelectric material layer.
B42D 15/10 - Identity, credit, cheque or like information-bearing cards (record carriers, e.g. credit or identity cards, for use with machines and with at least a part designed to carry digital markings G06K 19/00)
G02F 1/01 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour
H02N 2/18 - Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
The invention discloses an ink for the engraved steel die printing process, having a viscosity at 40° C. between 3 Pa·s to 15 Pa·s, preferably 5 to 10 Pa·s, and having a polymeric organic binder and magnetic pigment particle, characterized in that said magnetic pigment particles comprises a magnetic core material which is surrounded by at least one layer of another material. The surrounding layers, single or in combination, confer the pigment particle particular optical properties in the visible and/or in the near IR, chosen from high specular or diffuse reflectance, spectrally selective absorption or reflection, and angle-dependent absorption or reflection, and allow for the formulation of inks having a large gamut of color and other optical functionalities.
B32B 3/00 - Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shapeLayered products comprising a layer having particular features of form
B32B 5/16 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by features of a layer formed of particles, e.g. chips, chopped fibres, powder
B32B 7/00 - Layered products characterised by the relation between layers Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties Layered products characterised by the interconnection of layers
B05D 7/00 - Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
The invention discloses an ink for the engraved steel die printing process, having a viscosity at 40°C between 3 Pa.s to 15 Pa.s, preferably 5 to 10 Pa.s, and comprising a polymeric organic binder and magnetic pigment particle, characterized in that said magnetic pigment particles comprises a magnetic core material which is surrounded by at least one layer of another material. The surrounding layers, single or in combination, confer the pigment particle particular optical properties in the visible and/or in the near IR, chosen from high specular or diffuse reflectance, spectrally selective absorption or reflection, and angle-dependent absorption or reflection, and allow for the formulation of inks having a large gamut of color and other optical functionalities.
Magnetic ink and toner compositions traditionally comprise magnetic materials in fine particulate form, either as a dry composition or a liquid suspension. Often such materials are black or dark in color. Disclosed herein are particles compositions suitable for use as inks or toners, that exhibit desirable magnetic properties, and furthermore which include particles coated so they appear white substantially white, or colored. Such compositions present new opportunities for the production of corresponding magnetic layers, when the compositions are deposited in an appropriate manner to a substrate.
Magnetic ink and toner compositions traditionally comprise magnetic materials in fine particulate form, either as a dry composition or a liquid suspension. Often such materials are black or dark in colour. Disclosed herein are particles compositions suitable for use as inks or toners, that exhibit desirable magnetic properties, and furthermore which include particles coated so they appear white substantially white, or coloured. Such compositions present new opportunities for the production of corresponding magnetic layers, when the compositions are deposited in an appropriate manner to a substrate.
CANADA TEN DIX DOLLARS BANQUE DU BANK OF 10 OTTAWA THIS NOTE IS LEGAL TENDER CE BILLET A COURS SIR JOHN MACDONALD PRIME MINISTER PREMIER MINISTRE 1867 1873 1878 1891
