Security paper with authenticity features in the form of luminescing substances
Patent 4451530 Issued on May 29, 1984. Estimated Expiration Date: 
October 23, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 23, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3447851 3455577 3473027 3525698 3654463 3928226 Checking an identity, authority or check document or the like Method of making pigmented phosphors Paper secured against forgery and device for checking the authenticity of such papers Pigment coated phosphor and process for manufacturing the same InventorsAssigneeApplicationNo. 06/314843 filed on 10/23/1981US Classes:428/323, Including a second component containing structurally defined particles162/162, Coloring agent250/336.1, INVISIBLE RADIANT ENERGY RESPONSIVE ELECTRIC SIGNALLING250/365, Ultraviolet light source250/461.1, With ultraviolet source283/92, On incorporated fluorescent material356/71, DOCUMENT PATTERN ANALYSIS OR VERIFICATION428/207, Including coloring matter428/333, In terms of molecular thickness or light wave length428/403, Coated428/438, Next to cellulosic428/464, Next to cellulosic428/537.7, Next to layer of metal salt (e.g., plasterboard, etc.)428/690, Fluroescent, phosphorescent, or luminescent layer428/908, IMPRESSION RETENTION LAYER (E.G., PRINT MATRIX, SOUND RECORD, ETC.)428/913, MATERIAL DESIGNED TO BE RESPONSIVE TO TEMPERATURE, LIGHT, MOISTURE, ETC.428/916FRAUD OR TAMPER DETECTINGExaminersPrimary: Ives, P. C.Attorney, Agent or FirmInternational ClassesB41M 3/14 (20060101)G07D 7/12 (20060101) G07D 7/00 (20060101) D21H 21/40 (20060101) D21H 21/48 (20060101) G06K 19/14 (20060101) Foreign Application Priority Data1980-05-30 DEAbstractSecurity papers with luminescing authenticity features worked into them or printed on them. The authenticity features used consist of a luminophore and one or more absorbing materials by which the emission and/or the excitation spectrum of the luminophore is changed in detectable fashion. The dyestuff can be present as an admixture to the luminophore, as a coating of a luminophore layer or as a coating on luminophore powder grains. For checking the authenticity of documents the emission spectrum of the luminophore is not used but the change generated by the technology used in the emission or excitation spectra.Field of SearchNext to cellulosicNext to cellulosic Fluroescent, phosphorescent, or luminescent layer MATERIAL DESIGNED TO BE RESPONSIVE TO TEMPERATURE, LIGHT, MOISTURE, ETC. FRAUD OR TAMPER DETECTING ELECTROLUMINESCENT MATERIAL ABNORMALLY TRANSPARENT Coated Including a second component containing structurally defined particles In terms of molecular thickness or light wave length | |
