Tamper evident optically variable device and article utilizing the same
AssigneeOptical Coating Laboratory, Inc.
InventorsRoger W. Phillips, Vernon C. Spellman, Wayne L. Gossett, Marc A. Kamerling
Life of this patent
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Abstract
Tamper 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.
Claims21
In a tamper evident optically variable device, at least first and second layers with a spacer layer therebetween providing an optical color shift with change in viewing angle, and a release layer disposed between the first and second layers and forming a part of the optically variable device, said release layer permitting the first and second layers to be separated from each other to destroy the optical color shifting properties of the optically variable device.
In a tamper evident article, the article having first and second parts which are movable with respect to each other, and a tamper evident optically variable device disposed between and secured to the first and second parts and exhibiting a color shift with change in viewing angle, the tamper evident optically variable device having first and second layers with a spacer layer and a release layer disposed between the first and second layers, the release layer forming a part of the optically variable device and permitting separation of the optically variable device into two separate parts to destroy the optically variable color characteristics of the optically variable device when the first and second parts are moved with respect to each other.
Dependencies are inferred from the claim text.