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Method and apparatus for validating valuable documents

  • US 4,870,260 A
  • Filed: 08/20/1986
  • Issued: 09/26/1989
  • Est. Priority Date: 08/21/1985
  • Status: Expired due to Fees
First Claim
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1. An apparatus for validating a valuable document including a plurality of value markings arranged to form a first code word, said apparatus comprising;

  • means for reading said first code word to determine if said first code word is valid,means, responsive to said determination, for erasing in each of a plurality of erasing steps, one or more of said value markings, after each erasing step the erased and remaining unerased value markings forming another code word,a control and decision unit for determining if said sequence of other code words resulting from said erasing steps corresponds to a predetermined sequence of code words, and for producing a signal if said determination is affirmative, anda reading head and an erasing head for reading and erasing said value markings, a first output of said control and decision unit being connected to a control input of said reading head, a second output of said control and decision unit being connected to a control input of said erasing head, and wherein the outputs of said reading head are led to an input of said control and decision unit.

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