Method of determining the living character of an element carrying a fingerprint
US7567690B2 · kind B2 · utility
3Cited by
22References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2003 |
| Grant date | Jul 28, 2009 |
| Priority date | — |
| Expiry date | Jul 31, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/13
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention concerns a method of determining the living character of an element carrying a fingerprint, consisting of making impedance measurements at various points on the said element by means of electrodes. The method according to the invention is characterised in that it consists of determining whether the said impedance measurements satisfy a law of variation of the impedance measured by the said electrodes as a function of the surface area of the said electrodes covered by the said elements such that Z=ƒDt(S).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.