Rulable multi-directional prism cluster retroreflective sheeting
US8783880B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 2011 |
| Grant date | Jul 22, 2014 |
| Priority date | — |
| Expiry date | Nov 1, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/124
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A rotationally insensitive, retroreflective prismatic sheeting and method of manufacture is provided. The sheeting includes discrete clusters of cube corners that are separated from one another on all sides by a textured surface. Each of the cube corners in each cluster has a base edge that is not collinear or parallel with the base edges of cube corners on either side of it. The array of cube corners clusters is rulable, and the cube corners have different orientations. Four or more of the cube corners in each cluster may have edges that converge into a central point within the cluster, and the cube corners of the clusters may include at least two symmetrical pairs of cube corners. The shapes of the cube corner clusters may be polygonal, and all of the cube corners may share a common vertex located at the center of the polygonal shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.