Security substrate for documents of value
US6686027B1 · kind B1 · utility
44Cited by
11References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 25, 2000 |
| Grant date | Feb 3, 2004 |
| Priority date | — |
| Expiry date | Sep 25, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31909
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A security substrate for a document of value comprises a laminate including a generally transparent core layer and generally transparent outer layers on opposite sides of the core layer. At least one interference filter is embedded within the laminate. The interference filter includes a highly reflective opaque layer on a surface of the core layer and an optically variable thin film multilayer overlying at least a portion of the opaque layer. The interference filter is covered by one of the outer layers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.