Optically variable device
US9873282B2 · kind B2 · utility
4Cited by
3References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 26, 2011 |
| Grant date | Jan 23, 2018 |
| Priority date | — |
| Expiry date | Dec 5, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D2035/26
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A security element, security device and method of forming a security device wherein the security element includes focusing elements, a first group of image elements, and a second group of image elements, each image element being located in an object plane to be viewable through a focusing element, and being located a distance from the focusing element such that the focal point width of the focusing element in the object plane is substantially equal to the size of the image element or differs from the size of the image element by a predetermined amount.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.