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Identification function paper and identification card

  • US 7,322,522 B2
  • Filed: 11/17/2004
  • Issued: 01/29/2008
  • Est. Priority Date: 11/19/2003
  • Status: Expired due to Fees
First Claim
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1. An identification functional paper comprising a magnetized fiber comprising hollow fiber having an inner cavity filled with a magnetic material, wherein the magnetized fiber is manufactured by a process comprising the steps:

  • (i.) dispersing natural or artificial hollow fibers in a metal salt aqueous solution containing a water-soluble salt of a metal which forms the magnetic material;

    (ii.) adding alkali to the resulting fiber dispersion liquid in an inert gas atmosphere to obtain a metal hydroxide solution; and

    (iii.) oxidizing the resulting metal hydroxide to obtain the magnetic material.

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