Patent ID: 8251525

Claim:
Retroreflective sheeting, comprising a plurality of grooves that include a first groove having a first groove surface and a second groove surface, the first groove surface and the second groove surfaces of the first groove intersecting at a first groove vertex; a second groove having a first groove surface and a second groove surface, the first groove surface and the second groove surfaces of the second groove intersecting at a second groove vertex; a plurality of cube corner elements each of which has a first groove surface that is a part of the first groove, a second groove surface that is a part of the second groove, and a primary groove face; wherein the first groove and the second groove are parallel to each other within the degree of precision of the manufacturing process; wherein the first groove is nonparallel to a reference plane by amounts ranging from less than about 1 degree to greater than the degree of precision of the manufacturing process; wherein the reference plane corresponds to the y-z plane in a Cartesian coordinate system where the x-y plane extends substantially coplanar with the sheeting along which the cube corner elements are located and the x-z plane contains the primary groove vertex; and wherein the second groove is nonparallel to the reference plane by between about the degree of precision of the manufacturing process and one degree.