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| Number | Title | Issue Date |
| 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 prepared in advance plural kinds of pixel patterns in which... | 07/21/1998 |
| 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 thermoplastic or thermoset coatings, wherein a heat sensitive... | 07/14/1998 |
| 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 partially covering the first layer. The third layer covers ... | 06/02/1998 |
| 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 as a surface relief pattern on a substrate, to form a visua... | 05/26/1998 |
| 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 image produced by the beam illuminating the surface. The devic... | 05/12/1998 |
| 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 image is coated with a metal layer of low optical density,... | 04/21/1998 |
| 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 segments disposed on the surface of the roll; and the embossi... | 04/21/1998 |
| 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 individual holographic patches and contains identifying inf... | 03/17/1998 |
| 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 is used as a seal by the presence of the adhesive layer. ... | 12/23/1997 |
| 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 overlapping, regular arrays of lines or dots. Each array has a ... | 12/02/1997 |
| 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 different from each other. This grating is formed using a ... | 11/11/1997 |
| 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 restrictions on the installation position of the light-receiving ele... | 07/01/1997 |
| 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 verified as the one and only original. The mark is applied ... | 06/17/1997 |
| 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 light diffracting structure 10 has unique parameters generat... | 05/13/1997 |
| 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 grating elements, each the diffraction grating element to... | 05/06/1997 |
| 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 whereby the hologram is capable of reflecting light from a lase... | 04/22/1997 |
| 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 the identification regions, a light receiving device for det... | 04/15/1997 |
| 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 structure which permits viewing of the image in a fixed spatial o... | 01/21/1997 |
| 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 the center of the arc path at a preselected incidental an... | 10/29/1996 |
| 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 the hologram surface when the recorded information is rec... | 07/09/1996 |
| 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 is semi-transparent, thereby allowing the visualization of ... | 04/30/1996 |
| 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 using reconstructing light (2) having an incident region (... | 04/02/1996 |
| 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 by human vision when the playback illumination comprises n... | 03/12/1996 |
| 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 identified is affixed with an identification element comprising a r... | 03/05/1996 |
| 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 receptive coating. The indicia receptive coating covers the s... | 02/20/1996 |
| 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 the hologram recorded area with monochromatic light at a g... | 01/23/1996 |
| 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 wavelength to generate a first, visible pattern while any ... | 01/09/1996 |
| 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 maintain control of its own embossing shim on which the h... | 11/07/1995 |
| 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, the method comprising: continuously embossing the first an... | 11/07/1995 |
| 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 product comprises a transparent abrasion resistant moistu... | 10/03/1995 |
| 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 diffraction lens pattern for diffracting and focusing light beams... | 09/05/1995 |
| 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 sensor is arranged at the reconstruction position of the h... | 08/22/1995 |
| 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 identification purpose. The identification region comprises a light... | 08/01/1995 |
| 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 holographic image, the present invention comprises an optic... | 07/11/1995 |
| 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 image formed on the sheet is reconstructed by an identific... | 06/20/1995 |
| 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 underlying refractive index of the medium or the crystal parameter... | 06/06/1995 |
| 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 the base. The base may be, for example an information card... | 06/06/1995 |
| 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 particles that (1) comprise an organic polymer and further com... | 05/16/1995 |
| 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 specific authentication application, such a hologram or diffra... | 05/02/1995 |
| 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 (21 to 24), which are to be recorded, are re... | 01/03/1995 |
