Optical structures providing dichroic effects
US11840112B2 · kind B2 · utility
2Cited by
32References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 26, 2021 |
| Grant date | Dec 12, 2023 |
| Priority date | — |
| Expiry date | Aug 26, 2041 |
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.