Triangular-pyramidal cube-corner retro-reflective sheeting
US6942350B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 2004 |
| Grant date | Sep 13, 2005 |
| Priority date | — |
| Expiry date | Jun 6, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/124
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A triangular-pyramidal cube-corner retroreflective sheeting wherein a pair of triangular-pyramidal cube-corner retroreflective elements partitioned by three lateral faces (face a1, b1, and c1; faces a2, b2, and c2; . . . ) intersect almost perpendicularly because intersecting V-shaped grooves having substantially-symmetric cross sections are arranged in a closest-packed state so as to protrude to one side on a common-bottom plane (S-S′). Opposite faces (faces c1 and c2) of this pair of triangular-pyramidal retroreflective elements share a base (x), the common bottom plane (S-S′) including bases (z and z) of one-side lateral faces (faces a1 and a2) and bases (y and y) of the other-side lateral faces (face b1 and b2), this pair of triangular-pyramidal retroreflective elements have faced lateral faces (face c1 and c2) with shapes, and heights from the bottom plane (S-S′) up to apexes of the elements, that differ from each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.