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Authenticating and anti-counterfeiting device for currency

  • US 4,472,627 A
  • Filed: 09/30/1982
  • Issued: 09/18/1984
  • Est. Priority Date: 09/30/1982
  • Status: Expired due to Fees
First Claim
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1. A flexible, paper-like document of value comprising:

  • an integral flexible thin-film nematic liquid crystal device which undergoes a visible change in response to an applied voltage; and

    an integral flexible thin-film photovoltaic material electrically coupled to said liquid crystal device and responsive to ambient or artificial light to produce said applied voltage, whereby said document is easily authenticatable by the man-in-the-street and also is unreproducible by reprographic apparatus.

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