Directionally imaged sheeting
US4634220A · kind A · utility
82Cited by
10References
45Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1983 |
| Grant date | Jan 6, 1987 |
| Priority date | — |
| Expiry date | Feb 7, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/128
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Sheeting having images that are viewable within limited angles of viewing from the front of the sheeting are prepared from retroreflective sheeting or from sheeting patterned after retroreflective sheeting, i.e., sheeting having a monolayer of microlenses like the monolayer of microspheres in retroreflective sheeting. A layer of transparent material covers the back surface of the microlenses. Axial markings are disposed behind individual microlenses at the back of the layer of transparent material and the markings are viewable from the front of the sheeting as an image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.