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US 8,708,504 B2Granted
Retroreflective sheeting including cube corner elements
Assignee3M Innovative Properties Company
InventorKenneth L. Smith
Life of this patent
Estimating the term…
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.
Claims20
Retroreflective sheeting, comprising:
- a row including at least two preferred geometry cube corner elements having faces defined by a side groove set wherein at least two grooves within the set are nonparallel by amounts ranging from greater than nominally parallel to about 1°;
- 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°.
Dependencies are inferred from the claim text.