Tamper evident optically variable device and article utilizing the same
Patent 4721217 Issued on January 26, 1988. Estimated Expiration Date: 
August 7, 2006. 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.
August 7, 2006. 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 3858977 Tamper-indicating container assembly Tamper-evident container and method for making the same Container closure integrity system Patent #: 4502605 InventorsApplicationNo. 06/894320 filed on 08/07/1986US Classes:215/230, Including visual indicia206/459.1, WITH INDICATOR (I.E., VARIABLE INFORMATION EXHIBITING MEANS)206/807, TAMPER PROOF229/102, Tamper indicating359/582Layer having specified nonoptical propertyExaminersPrimary: Norton, Donald F.Attorney, Agent or FirmInternational ClassesB65D 55/06 (20060101)B65D 55/02 (20060101) AbstractTamper evident optically variable device comprising an optically variable device having at least first and second layers with a spacer layer therebetween providing a color shift with change in viewing angle. A release layer is disposed between the first and second layers to permit the first and second layers to be separated from each other and to thereby destroy the optical shifting properties of the optically variable device. | |
