Class 283/90 - Polarized

Subclass of Class 283 - Printed matter
Definition: Subject matter wherein the filter allows polarized visible
No. of patents: 32
Last issue date: 05/20/2008

Number	Title	Issue Date
7375888	Optical component An optical component contains two or more hidden images for authentication and antiforgery purposes. The images are successively revealed and concealed when the optical component is held between two polarisers and one of them is rotated. The optical component compri...	05/20/2008
7201821	Identifying medium and identifying method for object The present invention provides a discrimination medium A for discriminating the authenticity of an article by providing an optically discriminating mark on the article. A film 20 having a light reflecting layer of a polymer cholesteric liquid crystal having a...	04/10/2007
7089420	Authentication method and system The present invention provides a method and apparatus for the production and labeling of objects in a manner suitable for the prevention and detection of counterfeiting. Thus, the system incorporates a variety of features that make unauthorized reproduction difficul...	08/08/2006
7052762	Low Tg multilayer optical films Multilayer optical films are comprised of materials with glass transition temperatures below room temperature (	05/30/2006
7040663	Value document The invention relates to a document of value such as a paper of value or ID card with a security element having an optically variable material. Said optically variable material conveys different color effects at different viewing angles. Additionally, the security e...	05/09/2006
6819409	System for reading an information strip containing optically coded information A reading arrangement includes at least one linear detector arrangement which is arranged in parallel relationship above a reading plane and behind an optical imaging element and is oriented on to a reading region of the reading plane, lighting devices and an evalua...	11/16/2004
6667797	Phase retardation anti-counterfeit method The anti-counterfeit method of the invention conceals an authentication pattern in a retarder by means of specific treatments that achieve different phase retardation on the retarder. To authenticate the authentication pattern, the invention provides an i...	12/23/2003
6324004	Planar patterns with superimposed diffraction gratings A surface pattern (1) is composed of elements (2 to 5) which are arranged in a mosaic-like fashion and of which at least one pattern is formed from a background element (4) and a pixel (2) with microscopically fine relief structures diffracting visible li...	11/27/2001
6259506	Field activated security articles including polymer dispersed liquid crystals, and including micro-encapsulated field affected materials In a first aspect this invention provides a security article comprising an electrically actuated optical switch comprised of a liquid crystal material. In one embodiment the liquid crystal material is disposed in a layer of polymer dispersed liquid crysta...	07/10/2001
6176521	Variable color print with locally colored regions and method of making same A variable color print of an image includes a reflective image medium including a plurality of different, locally colored, image regions; a first plurality of repeated changes in reflective angle of the image medium which extend in a first direction and a...	01/23/2001
6124970	Polymer materials with latent images visible in polarized light and methods for their production An authenticatable product includes a non-opaque latent image layer of polymer material treated so as to contain at least one region having anisotropic optical properties such that, when viewed directly, the at least one region is indistinguishable from t...	09/26/2000
6086966	Method for authenticating a textile product and a thread and a woven label usable therewith A method for authenticating a textile product, wherein a colorless composition is applied to at least one portion of at least one thread of the textile product. The composition comprises one of a pair of a colorformer and an activator which react when mix...	07/11/2000
5925440	Removable scratch-off coating A card is disclosed that incorporates a removable scratch-off coating to hide printed symbols. The card is constructed so that the scratch-off coating is selectively retained by the card, in the form of symbols, or as a background for symbols, when the sc...	07/20/1999
5892239	Bill or security discriminating apparatus using P-polarized and S-polarized light A bill or security discriminating apparatus includes at least one irradiating device for irradiating a surface of a bill or security at a predetermined angle with the surface thereof, at least one polarization separating device for receiving light reflect...	04/06/1999
5595955	Verification method using pressure and heat-sensitive chromogenic system A pressure and heat-sensitive composition comprising chromogen-containing pressure-rupturable microcapsules and heat-sensitive color developer useful for verification of document authenticity system when applied as a localized coating on documents, such a...	01/21/1997
5543608	Method and the system for identifying a visual object with a polarizing marker An identifying procedure and system for identifying a visual object, the object to be identified (1) being marked with a polarizing surface (2) provided in the region of the object. Observation of the object is accomplished by utilizing the lighting preva...	08/06/1996
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
5347111	Authenticity identifying structure for an article For the purpose of identifying the authenticity of an article, an incident detecting light beam having a certain wave length and a polarization plane extending in a certain direction is projected from a light emitting element, and the plane of polarizatio...	09/13/1994
5284364	Increased-security identification card system The invention is a document security system characterized by a data substrate having photographic or printed information on a base print, and also having a personalized polarization-altering overlay sealed to the base print and encoded with additional cod...	02/08/1994
5196243	Printed matter Printed matters are disclosed, which are printed with the coloring ink that is able to do the short-time fading at which time the color is losen of itself in a relatively short time after once having developed color by interacting with the coloring assist...	03/23/1993
5101296	Light-polarizing mosaic pair Information in binary form is stored in a planar array or mosaic of light-polarizing cells, wherein each cell may have two distinct orientations of the axis of polarization. For example, binary "1" may be denoted by setting the axis of polarization in any...	03/31/1992
5060981	Transparent overlay for protecting a document from tampering A transparent overlay that can protect a document from tampering has a transparent cover sheet, a layer of hot-melt adhesive over one surface of the transparent cover sheet, and a polymeric image-receiving layer over the exposed face of said hot-melt adhe...	10/29/1991
5020882	Electro-optic animated displays and indicators In this invention, animation effects have been obtained in a device containing a light source illuminating a linear polarizer producing plane polarized light which is rotated in an electro-optical cell/cells such as a Liquid Crystal or PLZT cell. The angl...	06/04/1991
5004327	Light-polarizing material in the form of sheets or of a web and a method for the manufacture of the material A light-polarizing element for use in a security document to permit authentication of the security document includes an intermediate layer of water-absorbing polymer material laminated between two outer layers of transparent material. The intermediate lay...	04/02/1991
4941686	Identity card An optically-readable identity card has an inner core layer of material which inhibits light from the optical reader from passing through the body of the card. The inner core material is a plastic vinyl colored either black, gold, silver or any metallic c...	07/17/1990
4896901	Flexible sheet or web materials A document security article is disclosed in which a light polarizing element is contained within a flexible sheet element. A region of the light polarizing element is exposed at a window at both faces of the sheet element and optionally at a further windo...	01/30/1990
4659112	Identification system comprising a partially reflective retardation device There is disclosed a tamper-free identification system, such as an ID card, comprising an information-bearing substrate made of a flexible but substantially rigid material, a partial light reflector superposed over said substrate which produces a substant...	04/21/1987
4579754	Identification card having laser inscribed indicia and a method of producing it A multilayer identification card in which information in the form of patterns, letters, numbers and/or pictures is inscribed by means of a laser recorder in a laser transformable layer of the identification card which is made of plastic and is transparent...	04/01/1986
4544836	Optically-based access control system An optically-based coded card identification system is provided in which a card having an access code defined by adjacent differently-polarized elements used in a transmissive or reflective mode is interrogated through a deep red or near infrared transmis...	10/01/1985
4250393	Photoelectric apparatus for detecting altered markings An optical reading apparatus is described for reading documents which contain information in the form of optical markings which deflect a reading beam coming from a light source in at least one given direction of deflection. A first light sensor detects a...	02/10/1981
4157784	Safeguard against falsification of securities and the like which is suitable for automatic machines The valuable papers, such as the securities and the like, have safeguard elements against forgery or falsification and which can be mechanically examined using light of the visible, ultraviolet or infrared spectral regions and which are effective, particu...	06/12/1979
4098940	Thermoplastics sheets or composite sheets with optical inhomogeneities The present invention is related to a sheet or a composite sheet made of transparent thermoplastics with optical inhomogeneities according to a desired and reproducible pattern, which are not discernible with an unaided eye, and which produce polarization...	07/04/1978

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Class 283/90 - Polarized