Methods of manufacturing security devices
US10759213B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 24, 2017 |
| Grant date | Sep 1, 2020 |
| Priority date | — |
| Expiry date | Feb 24, 2037 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D25/40
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A security device manufacturing method includes: providing a substrate having a viewing region; providing an obscuring layer in the region; providing a first image; applying a mask to the first image and swapping colour components of first and second sub-images of the first image forming: a mask pattern, and a background pattern representing the unswapped colour components on their assigned side; and printing the mask and background patterns on corresponding layer sides. The layer reduces colours visibility on one side when the other side of the layer is viewed in reflection, and allows light through the region when the security device is viewed in transmitted light. When either side of the region is viewed in reflected light, the patterns on that side are dominantly visible and may be distinguished. When the region is viewed in transmitted light from either side, the region is transparent and the colour-composite image is visible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.