Method of making tamper-evident structures
Patent 5015318 Issued on May 14, 1991. Estimated Expiration Date: 
January 11, 2009. 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.
January 11, 2009. 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 841321 2360325 Switch-proof label Thermoplastics sheets or composite sheets with optical inhomogeneities Light transmission guides Sheet printed with invisible inks Container tamper detection device Tamper-indicating container assembly Tamper visible indicator for container lid Tamper evident closures and packages InventorsAssigneeApplicationNo. 295899 filed on 01/11/1989US Classes:156/233, Metal foil lamina156/289, Utilizing parting or release material to prevent adhesion156/308.4, Only part of contacting laminae surfaces bonded; e.g., seam, seal, etc.283/72, HAVING REVEALABLE CONCEALED INFORMATION, FRAUD PREVENTER OR DETECTOR, USE PREVENTER OR DETECTOR, OR IDENTIFIER283/81, Label283/85, Utilizing electromagnetic radiation283/95, Utilizing chemical283/101, Adhesively attached283/114, Having specific color428/43, SHEET, WEB, OR LAYER WEAKENED TO PERMIT SEPARATION THROUGH THICKNESS428/469, Next to metal salt or oxide428/915, Fraud or tamper detecting428/916FRAUD OR TAMPER DETECTINGExaminersPrimary: Ball, Michael W.Assistant: Falasco, Louis Attorney, Agent or FirmForeign Patent References
International ClassesB32B 031/00B32B 031/20 B65D 065/28 AbstractThe method involves forming a laminate capable of generating a substantially non-dichroic color by a light interference and absorption phenomenon by depositing a layer of a metal of medium light reflectivity by a vapor deposition technique on a suitable substrate, anodizing a surface of the metal in the presence of fluorine ions to form a detachable film of an oxide of the metal on the surface having a thickness suitable for color generation, and adhering a flexible strip of transparent or translucent material over the oxide film in such a manner that the strength of attachment of the flexible strip to the oxide film exceeds the adhesive strength between the oxide film and said surface of said metal.Other References
Field of SearchSHEET, WEB, OR LAYER WEAKENED TO PERMIT SEPARATION THROUGH THICKNESSIntermediate layer is discontinuous or differential Translucent outer layer Including metal layer Next to metal salt or oxide Fraud or tamper detecting FRAUD OR TAMPER DETECTING FRAUD OR TAMPER DETECTING Metal, glass, or ceramic base Utilizing transitory attached element or associated separate material Temporary protective coating, impregnation, or cast layer Utilizing parting or release material to prevent adhesion Only part of contacting laminae surfaces bonded; e.g., seam, seal, etc. With treating agent application to a surface Including visual indicia Specific spectral transmittance or reflectance Metal oxide or hydrate thereof FOR METALLIC LEAF Liquid reactive coating composition utilized Nonreactive halogenated hydrocarbon Contains lubricant or oil or overcoat thereof | |
