Security articles comprising groups of microstructures made by end milling
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United States of America Patent
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Nov 7, 2023
Grant Date -
Jun 29, 2023
app pub date -
Feb 5, 2018
filing date -
Feb 14, 2017
priority date (Note) -
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Abstract
The present disclosure relates to end milling methods for making microstructures, a tool comprising such microstructures, the microstructures, and replications thereof, where the microstructures are part of a structured surface configured as a security article. Some of the microstructures are configured differently from others to define an optically detectable indicia in the structured surface. Microstructures in a first group may for example differ from microstructures in a second group in terms of one or more of size, orientation, cube corner type, and dihedral angle value(s), to define the indicia or a portion thereof. The microstructures may comprise full or truncated cube corner elements, and the article may be a retroreflective sheeting.
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