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US 8,998,428 B2Granted
Retroreflective sheeting including cube corner elements
Assignee3M Innovative Properties Company
InventorKenneth L. Smith
Life of this patent
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Abstract
The present disclosure is directed to lamina(e) comprising cube corner elements, a tool comprising an assembly of laminae and replicas thereof. The disclosure further relates to retroreflective sheeting.
Claims9
Retroreflective sheeting, comprising:
- a plurality of preferred geometry cube corner elements having a hexagonal shape when viewed in plan view;
- at least some of the preferred geometry cube corner elements including at least one of skew or inclination;
- and
- wherein the sheeting exhibits an average brightness at 0° and 90° orientation according to ASTM D4596-1a of at least 375 candelas/lux/m2 for an entrance angle of −4° and an observation angle of 0.5°.
1 more element
Dependencies are inferred from the claim text.