The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 28, 2009
Filed:
Dec. 19, 2003
Jean-christophe Foundeur, Levallois-Perret, FR;
Joel-yann Fourre, Couveciennes, FR;
Laurent Lambert, Paris, FR;
Jean-Christophe Foundeur, Levallois-Perret, FR;
Joel-Yann Fourre, Couveciennes, FR;
Laurent Lambert, Paris, FR;
Sagem Securite, Paris, FR;
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=ƒ(S).