Retroreflective sheeting with retroreflective markings
US4082426A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 26, 1976 |
| Grant date | Apr 4, 1978 |
| Priority date | — |
| Expiry date | Nov 26, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F13/16
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Retroreflective sheeting is taught which incorporates markings that are distinctly visible when the sheeting is viewed at an angle under retroreflective viewing conditions, thereby allowing a viewer to determine the identity of the sheeting. The sheeting comprises a monolayer of microsphere-lenses; a spacing layer coated on the microsphere-lenses and contoured so as to generally follow the curved back surfaces of the microsphere-lenses; a specularly reflective layer coated over the spacing layer; and a transparent image layer disposed in an imagewise pattern between the spacing layer and specularly reflective layer, with the thickness of the image layer being greater in the valleys of the spacing layer between the microsphere-lenses than on the curved surfaces directly in back of the microsphere-lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.