Optical structures providing dichroic effects
US11198316B2 · kind B2 · utility
4Cited by
29References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 3, 2020 |
| Grant date | Dec 14, 2021 |
| Priority date | — |
| Expiry date | Feb 3, 2040 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D25/45
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A document, product, or package, such as a banknote, passport or the like comprises structures having dichroic effects that change color with viewing angle in both transmission and reflection. Such structures can be useful as security features that counter the ability to effectively use counterfeit documents, products, packages, etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.