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Personal verification system

  • US 5,757,278 A
  • Filed: 12/18/1995
  • Issued: 05/26/1998
  • Est. Priority Date: 12/26/1994
  • Status: Expired due to Fees
First Claim
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1. A personal verification system comprising:

  • a plurality of linear electrodes arranged on a substrate;

    a non-conductive porous film formed of a material which repels water and transmits water vapor arranged on the plurality of linear electrodes; and

    detector for detecting a change in resistance across the linear electrodes based on transmitted water vapor, when a finger is placed on the porous film in a direction substantially perpendicular to a longitudinal direction of the linear electrodes.

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