Patent ID: 8714757

Claim:
An article, comprising: preferred geometry cube corner elements wherein at least one cube comprises a 1-2 dihedral angle error and a 1-3 dihedral angle error; wherein the 1-2 and 1-3 dihedral angle errors vary in opposition; and wherein the article exhibits at least one of the following average brightness measurements: an average brightness at 0° and 90° orientation according to ASTM D4596-1a of at least 625 candelas/lux/m 2 for an entrance angle of −4° and an observation angle of 0.2°; an average brightness at 0° and 90° orientation according to ASTM D4596-1a of at least 575 candelas/lux/m 2 for an entrance angle of −4° and an observation angle of 0.33°; an average brightness at 0° and 90° orientation according to ASTM D4596-1a of at least 375 candelas/lux/m 2 for an entrance angle of −4° and an observation angle of 0.5°; or an average brightness at 0° and 90° orientation according to ASTM D4596-1a of at least 80 candelas/lux/m 2 for an entrance angle of −4° and an observation angle of 1.0°.