Double-blind security features
US7976068B2 · kind B2 · utility
2Cited by
23References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 27, 2007 |
| Grant date | Jul 12, 2011 |
| Priority date | — |
| Expiry date | Dec 6, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S283/902
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A compound security feature is formed by printing latent images together with visually integrated settings using an invisible ink. Even if illuminated by a wavelength capable of rendering the inks visible, the latent images remain visually indistinguishable from their visually integrated settings. However, the latent images and visually integrated settings differ in one or more less obvious ways so that the latent images can be distinguished by using a visual aid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.