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US 2014/0368902 A1Published application
Retroreflective articles including a security mark
Assignee3M Innovatine Properties Company
InventorsSuman K. Patel, Bruce D. Orensteen, Mikhail L. Pekurovsky
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Abstract
The present disclosure relates to prismatic retroreflective articles that includes a security mark and to methods of making such articles.
Claims26
A retroreflective article, comprising:
- a retroreflective layer including multiple cube corner elements that collectively form a structured surface;
- one or more barrier layers positioned adjacent to the structured surface;
- and
- a conforming layer positioned adjacent to the one or more barrier layers;
- wherein one or more of the layers in combination form a security mark having a first portion including a first characteristic and a second portion including a second characteristic, wherein the characteristic is one of color and infra-red absorbency.
2 more elements
A method of forming a retroreflective article, comprising:
- providing a retroreflective layer including multiple cube corner elements that collectively form a structured surface;
- positioning one or more barrier layers adjacent to the structured surface to form a security mark having a first portion including a first characteristic and a second portion including a second characteristic, wherein the characteristic is one of color and infra-red absorbency;
- positioning a conforming layer adjacent to the one or more barrier layers;
- and
- laminating the layers.
2 more elements
Dependencies are inferred from the claim text.