Photoluminescent markings with functional overlayers
US7960688B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 18, 2009 |
| Grant date | Jun 14, 2011 |
| Priority date | — |
| Expiry date | Aug 5, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2019/06225
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Disclosed are photoluminescent markings that contain a photoluminescent layer and one or more functional overlayers wherein the photoluminescent marking has an emission signature that lies partly or fully in the infrared region of the electromagnetic spectrum. One functional overlayer conceals the photoluminescent layer and blends into the background or blends with marks that are normally present, without significantly reducing the luminescent intensity of the photoluminescent layer. Another functional overlayer provides photolytic stability to the underlying photoluminescent layer. Also disclosed are functional overlayers that enhance the daytime observability of the infrared emissions. A further functional overlayer prevents the observability of a printed message with the naked eye. A combination of functional overlayers each providing a different function is also included. Also disclosed are a multifunctional overlayer and methods of creating and using the inventive photoluminescent markings as well as objects containing the inventive photoluminescent markings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.