Ultraviolet luminescent retroreflective sheeting
US5759671A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1996 |
| Grant date | Jun 2, 1998 |
| Priority date | — |
| Expiry date | Aug 15, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/252
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Ultraviolet luminescent retroreflective sheeting includes a retroreflective portion containing retroreflective elements and an ultraviolet luminescent portion to facilitate nighttime viewing by persons not located at or near a source of light being retroreflected by the retroreflective portion. At least part of the ultraviolet luminescent portion is provided as the bonding lines for bonding the transparent cover sheet to the support sheet to form a series of sealed cells in which the retroreflective elements, which may be of the encapsulated lens-type or the encapsulated cube-corner-type, are disposed. The ultraviolet luminescenct portion includes fluorescent agent which emits light when irradiation by ultraviolet irradiation. The ultraviolet luminescent retroreflective sheeting may be used in a display device, such as a roadside sign, in combination with a source of ultraviolet radiation means which may be formed integrally with the sheeting or spaced therefrom and which will, in operation, emit ultraviolet rays in the direction of the retroreflective sheeting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.