Security document including a transparent window formed in the substrate thereof
US12227021B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 2023 |
| Grant date | Feb 18, 2025 |
| Priority date | — |
| Expiry date | Apr 6, 2043 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D25/29
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Examples include a security document having a substrate with a transparent window. In the region of the transparent window, a micro-optical structure including microlenses is arranged on one side of the substrate and a first print image is arranged on the other side of the substrate, opposite the micro-optical structure. A layer covers at least a section of the first print image. The layer allows electromagnetic radiation having a wavelength in the range of 380 nm to 780 nm to pass with a transparency in a range between 10% and 90%. The transparency gradually varies over a planar extension of the layer. A second print image is arranged on the layer in such a way that the second print image, or at least a piece of information contained therein, can be brought into alignment with the micro-optical structure after carrying out a folding process and becomes visible and/or recognizable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.