Phosphorescent epoxy overlay
US6005024A · kind A · utility
Inventors
Key dates
| Filing date | Jan 6, 1998 |
| Grant date | Dec 21, 1999 |
| Priority date | — |
| Expiry date | Jan 6, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B3/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention pertains to novel durable, tough, transparent, luminescent overlay compositions, useful for highlighting and/or illuminating and preserving surfaces and markings thereupon, such as roadways/highways, pedestrian passageways, airport runways, traffic control surface markings on travelways such as those listed above, traffic control devices/signs, structures, and articles. The clear compositions contain a moisture sensitive luminescent substance (for example, a phosphorescent substance having increased brightness and longer lasting afterglow) and an epoxy resin which imparts moisture stability to the luminescent substance, and durability and longer life to the underlying markings, surface area, structure or article. The clear transparent compositions can be applied as an overlay to existing surface area markings, or to unmarked surface areas themselves, or to structures or articles without obscuring the original appearance or color of the marking/surface/structure/article, to cover and/or protect the marking/surface/structure/article for an extended period of time, while providing indoor and outdoor luminescence on the marking/surface/structure/article in dark co…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.