Light control film formed with a security feature
US9682592B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 1, 2013 |
| Grant date | Jun 20, 2017 |
| Priority date | — |
| Expiry date | Jul 24, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2207/123
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A light control film is described that is formed with at least one security feature therein. The security feature is not visible when the film is viewed at an incorrect angle. The security feature only becomes visible when the film is viewed at the correct viewing angle or range of viewing angles. A plurality of security features can be formed in the film at substantially the same location(s), but at different angles, so that each security feature only becomes visible when the film is viewed at the correct respective viewing angle or range of viewing angles. The light control film can be integrated into any type of document where resistance to counterfeiting and fraudulent alteration are important, such as plastic identification or credit cards, or passports.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.