Diced retroreflective sheeting
US4202600A · kind A · utility
186Cited by
7References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1978 |
| Grant date | May 13, 1980 |
| Priority date | — |
| Expiry date | Apr 24, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/124
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Retroreflective sheeting having a plurality of retroreflective cube corner prisms distributed over one of its surfaces is described. The prisms are disposed in a planar array having a plurality of zones of prisms having differing angular orientations such that the zones have differing retroreflective brightness when illuminated by a light beam at a high angle of incidence. The zones are small enough to be substantially unresolvable by the unaided human eye at the expected viewing distances, so that the sheeting appears to have uniform retroreflective brightness when viewed at a high angle of incidence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.