Security device
US6712399B1 · kind B1 · utility
78Cited by
7References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 17, 2002 |
| Grant date | Mar 30, 2004 |
| Priority date | — |
| Expiry date | May 18, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/916
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A security device comprises an optically variable effect generating structure (3,4). An obscuring layer (7) is located, in use, between the optically variable effect generating structure and a substrate (8) to which the device is secured. A color layer (6) is also included which exhibits one or more predetermined colors when viewed under certain viewing conditions from the side of the device remote from the obscuring layer. The obscuring layer (7) is substantially opaque under the said certain viewing conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.