Matches 151 - 200 out of 255 < 1 2 3 4 5 6 >
Match Document Document Title
5825547 Diffractive device for generating one or more diffracting images including a surface relief structure at least partly arranged in a series of tracks  
A diffractive device having a surface relief structure which, when illuminated by a light source, generates one or more diffraction images which are observable from particular ranges of viewing...
5825514 Master hologram for the production of copy-proof holograms  
A method for the production of holograms proof against copying and imitation possessing authenticity features, which are copies of a master hologram. In accordance with the invention as a master...
5825475 System and method for determining which of a plurality of visually indistinguishable objects have been marked with a covert indicator  
A system and method for determining which of a plurality of visually indistinguishable objects have been marked with a covert indicator in which a portion of a surface of each of a first type of...
5815292 Low cost diffraction images for high security application  
A security device includes two plastic layers and a metal layer. The plastic layers may be embossed or surface cast with contrasting surface relief diffraction patterns. A second metal layer may be...
5812287 Holograms having a standard reference color  
Holograms and diffraction gratings are described wherein the presence of a "key-colour" (Magenta) permits an observer to identify the position where all the other colours of the hologram in...
5808758 Data carrier with an optically variable element  
A data carrier with an optically variable element has a layer regularly reflecting incident light and including interruptions. A diffusely scattering layer is disposed on the regularly reflecting...
5801857 Data carrier having an optically variable element and methods for producing it  
The invention relates to a system comprising a series of data carriers, in particular identity cards, papers of value or the like, whereby the data carriers belonging to the system exhibit...
5798850 Method of and apparatus for duplicating hologram and duplicate hologram  
A hologram duplicating method and apparatus whereby a photosensitive material film is continuously and smoothly brought into close contact with the surface of a hologram original plate, and the...
5793502 Secure optical identification means and method with enhanced variability  
In a preferred embodiment, secure optical identification, including: a first lacquer layer; a metallic layer disposed on a first surface of the first lacquer layer, with a first surface of the...
5786910 Pattern metallized optical varying security devices  
Security devices which are difficult to reproduce include a grid screen metallization pattern. The grid screen metallization pattern may be laid down over a hologram or diffraction grating formed...
5784200 Difraction grating recording medium, and method and apparatus for preparing the same  
A hologram seal for security is prepared in pseudo manner by using a diffraction grating pattern. A picture data of a plurality of motifs is inputted to a computer. Within the computer, there are...
5781316 Semi-transparent reflective hologram and method of producing same  
A semi-transparent holographic transfer foil film for application to a substrate such as a security device. The film is comprised of a thermally stable carrier for supporting multiple layers of...
5760961 Optical information carrier having diffractive features and diffraction modulation layers  
An information carrier is in the form of a composite laminate with a first, a second and a third layer having refractive indices n3, n4, n5 respectively. The second layer forms structures by only...
5757521 Pattern metallized optical varying security devices  
Security devices which are difficult to reproduce include a grid screen metallization pattern. The grid screen metallization pattern may be laid down over a hologram or diffraction grating formed...
5751412 Diffraction viewing device to aid in authenticating an optical surface  
A viewing device to aid in authenticating an optical surface. The device includes a laser diode which produces a beam of light. The device includes a viewing screen which receives a diffracted...
5742432 Apparatus for manufacture of diffraction gratings for identification means  
In one preferred embodiment, an apparatus for embossing diffraction patterns on a sheet, the apparatus including: an elongate, rotatable, cylindrical roll; a plurality of arcuate embossing shim...
5742411 Security hologram with covert messaging  
A security device includes a holographic image observable in ambient light and through which a covert image is observable in a focussed beam of bright light, such as a flash light. The holographic...
5729365 Computer generated holographic microtags  
A microlithographic tag comprising an array of individual computer generated holographic patches having feature sizes between 250 and 75 nanometers. The tag is a composite hologram made up of the...
5700550 Transparent hologram seal  
A hologram forming layer, transparent evaporated layer, colored layer, adhesion anchor layer, and adhesive layer are sequentially laminated on the under surface of a base member. The laminated body...
5694229 Holographic security device  
A holographic effect is generated on a holographic security device by diffraction of light by a surface relief pattern on a film. When illuminated, a moire pattern is generated from a pair of...
5687012 Hologram in which a plurality of areas are set and holography system to which hologram is applied  
A hologram is formed using a grating and a second hologram serving as an image hologram. The grating is constituted by a plurality of areas whose spatial frequencies and diffraction directions are...
5644412 Hologram and method of reading the same  
A hologram which contains the record of a parallel bar-shaped pattern, like a bar code pattern, and which can be read with a single light-receiving element of simple structure with fewer...
5640255 Holographic authentication patch  
A method is disclosed to holographically mark an object in a way that the mark cannot be removed, reproduced, or transferred covertly. The mark can be read from a distance so that the part can be...
5629070 Authentication label and authenticating pattern incorporating diffracting structure and method of fabricating them  
A light diffracting structure 10 in an authenticating pattern 20 especially for an authentication label 30 is used for authenticating and protecting against forgery various valuable objects. The...
5627663 Secure optical identification method and means  
In a preferred embodiment, a method of providing secure identification for an article, including: providing on the article a diffraction grating strip including a pattern of a series of diffraction...
5623347 Holograms for security markings  
A hologram for security markings is provided by a laser transmission hologram (1-4) formed as a surface relief pattern and a coating of a thin metallic layer (5) on the surface relief pattern...
5621515 Identification system using regions of predetermined properties interspersed among regions of other properties  
In an article identification system comprising a plurality of identification regions affixed on an article, a light emitting device for impinging an illuminating light beam onto at least some of...
5596402 Viewing device and method for ascertaining simultaneously optical color shift characteristics of an optically variable device  
A viewing device for use by an observer to ascertain the authenticity of an instrument of value having an image formed from an optically variable device. The viewing device includes a frame...
5570207 Holographic image identification system  
A holographic image identification system includes an image reconstruction device having a laser beam source movable along an arc path to selectively project a laser beam onto a hologram located on...
5535023 Method of reading hologram information  
A method of photoelectrically reading information recorded in the form of a Fresnel hologram, which makes it possible to eliminate the effect on the reading accuracy of a scratch, a stain, etc., on...
5513019 Semi-transparent reflective layer for a phase hologram  
A phase hologram is embossed in a mylar web having a reflective layer which is made from tin tungsten oxide, zinc sulfide, or a mixture thereof. The embossed microtexture produces a hologram that...
5504594 Hologram, article including hologram, and hologram recording and reconstructing methods  
A method of reconstructing a hologram (1) recorded so that an image of a plurality of parallel bar-shaped patterns (3) is reconstructed. An image of the bar-shaped patterns (3) is reconstructed by...
5499116 Encoded hologram for producing a machine readable image and a human readable image  
An encoded hologram that produces a first image and a second image pursuant to playback illumination, wherein the first image is resolvable by human vision while the second image is not resolvable...
5497227 System for determining the authenticity of an object  
Provided is an identification system which is highly effective in identifying the authenticity of an object and extremely difficult to analyze for the purpose of forgery. The object to be...
5492370 Decorative article  
The article includes a substrate which is composed of a single ply that contains both a structure for generating a viewable optically variable effect, such as a hologram, and carries an indicia...
5486933 Monochromatic-light reproduction type hologram, and method and apparatus for its image reproduction  
A monochromatic-light reproduction type hologram having a hologram recorded area provided with interference fringes that form a hologram image, the hologram image being reproducible by irradiating...
5483363 Security device  
A security device includes first and second diffractive structures contained within a surface relief structure. The structures are such that the device responds to illumination at a first, visible...
5465176 Method of embossing repeating patterns on a substrate, the patterns having different rates of repetition  
In a preferred embodiment, a method of producing embossed first and second elongate, edgewise side by side, repeating, optical patterns on a sheet for use in producing secure identification means,...
5464690 Holographic document and method for forming  
A holographic article and method for forming permits the party producing the final document to print the holographic image directly on the final document thereby permitting such party to retain and...
5455129 Holographic products with sealed edges  
A holographic product with sealed edges which will resist delamination before and after attachment to a substrate when exposed to moisture or abrasion resulting from ordinary usage. The holographic...
5448659 Waveguide-type image transmission device and fingerprint identification device  
A card-shaped waveguide-type image transmission device has an image transmission base member piled up on a light illumination base member, and an optical system such as grating patterns and...
5444225 System and process for reading hologram code, hologram and card containing hologram  
A hologram code reading system wherein the reconstruction light of a light source illuminates the recorded area of a hologram that contains codified data recorded as image data, and a code reading...
5438403 Article identification system  
Provided is a system for identifying the authenticity of an article which is reliable, and would not restrict the freedom of design. An identification region is defined on the article for...
5432329 Automated holographic optical recognition and decoding system for verification  
The present invention discloses a method of automatically decoding holographic signals by establishing an optical clock and performing subsequent optical signal analysis. In addition to a primary...
5426520 Method of legitimate product identification and seals and identification apparatus  
A Fourier transform hologram image is created on a sheet on the seal. The image is made, by making a die from the Fourier transform hologram image master plate and by molding resin on the die. The...
5422873 Multiplexing and selective updatable fixing and erasing of volume holograms in photorefractive media and second harmonic generation in photorefractive media by optically induced periodic poling  
New methods are presented for multiplexing volume holograms in electrooptic materials. Multiple volume holograms can be superimposed in a medium and be individually addressed by tuning the...
5422744 Bar code incorporated into holographic display  
In order to improve security for holographic labels which are positioned on a substrate base, a bar code symbol with regions of different light reflective properties is holographically recorded on...
5415950 Holographic flake pigment  
Holographic flake pigments, processes for making the pigments, decorative coatings comprising the pigments, and articles comprising the decorative coatings are disclosed. The pigment comprises...
5411296 Non-continuous holograms, methods of making them and articles incorporating them  
Non-continuous reflective holograms or diffraction gratings are provided in various forms for authenticating documents and things, and for decorative and product packaging applications. In one...
5379131 Method of preventing forgery of diffraction grating pattern and forgery-proof diffraction grating pattern recording structure  
A method of preventing forgery of a diffraction grating pattern containing the record of specific information, and a forgery-proof diffraction grating pattern recording structure. Patterns (2 1 to...
Matches 151 - 200 out of 255 < 1 2 3 4 5 6 >