Photoluminescent markers and methods for detection of such markers
US6808542B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 2001 |
| Grant date | Oct 26, 2004 |
| Priority date | — |
| Expiry date | Dec 26, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/13
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention provides photoluminescent markers consisting essentially of fluorene copolymers, which are colorless or nearly colorless to the naked eye and exhibit strong photoluminescence between about 380-800 nm upon exposure to ultra-violet radiation or laser light. The soluble fluorene copolymers described in this invention having a general formula as shown in Formula 1. where:R1 and R2 are C1-C24 linear or branched alkyl chain,n is the number of repeating unit,M is a co-monomer unit having structures chosen to impart distinct physical or chemical properties to the marker. Also provided in the present invention are methods of use of the markers for tagging solid or liquid products and methods to detect said markers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.