Self-verifying security documents
US6467810B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 2001 |
| Grant date | Oct 22, 2002 |
| Priority date | — |
| Expiry date | May 30, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D2035/50
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A self-verifying security document, such as a banknote, comprises a flexible sheet formed from a plastics substrate bearing indicia. The sheet has a window of transparent plastics material which includes self-verification means for verifying a security device provided at a laterally spaced second portion of the sheet when the sheet is bent or folded to bring the window into register with the security device. The self-verification means may be an optical lens for reading an area of microprinting. In another embodiment, the self-verification means may be an optical filter for viewing an area printed with metameric inks. In other embodiments, the self-verification means and the security device may be polarizing windows or Moire inducing patterns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.