DYNAMIC MICRO-OPTIC SECURITY DEVICES, THEIR PRODUCTION AND USE
Disclosed are devices with dynamic optical properties suitable for use as security or authentication devices, for example for documents or items of importance or value, in order to help prevent counterfeit of the same. Such devices, at least in selected embodiments, enable observation of dynamic cha...
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Main Authors | , , , |
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Format | Patent |
Language | English French |
Published |
29.06.2023
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Subjects | |
Online Access | Get full text |
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