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PAPER DOCUMENT VALIDATION APPARATUS

  • US 3,583,237 A
  • Filed: 04/14/1969
  • Issued: 06/08/1971
  • Est. Priority Date: 04/14/1969
  • Status: Expired due to Term
First Claim
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1. Apparatus to detect authenticity of paper documents having at least one section of uniformly spaced surface bumps or contours, which apparatus comprises a frame defining a testing area, electromechanical transducer means positioned within the testing area adapted to engage the surface of a document entering therein and produce a signal indication thereof, means to carry a document and effect relative uniform movement between the document and the transducer means in the testing area, means to generate an audio frequency signal from the signal indication of thE transducer means, and an electromechanical filter including an audio frequency sensitive switch actuated by a proper frequency signal from the last said means to indicate an authentication.

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