Security document containing an authentication device
US10052904B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 2007 |
| Grant date | Aug 21, 2018 |
| Priority date | — |
| Expiry date | Jan 7, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49155
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A flexible security document is provided which contains an authentication device including: a) source of electrical potential (5), the source including a piezoelectric polymeric material including at least one terpolymer of vinylidene fluoride (VDF), trifluoroethylene (TrFE) and a halogenated ethylene based monomer containing at least one non-fluorine halogen atom, the source of electrical potential being activated by mechanical deformation; b) reporter element (3) including a material capable of switching electrically between a first state and a second state, the difference between the first state and the second state being able to be perceived by an unaided human; and c) conducting elements (8) electrically connecting the source of electrical potential and the reporter element to produce an electric circuit. The reporter element (3) may take a number of different forms, such as a light emitting device which lights up or undergoes color change when activated by the source of electrical potential to provide an indication of authenticity. In a particularly preferred embodiment, the flexible security document is a banknote and the source of electrical potential is applied by printing…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.