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Credit card and credit card identification system for automatic vending equipment

  • US 3,872,438 A
  • Filed: 05/04/1973
  • Issued: 03/18/1975
  • Est. Priority Date: 05/04/1973
  • Status: Expired due to Term
First Claim
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1. A vending machine system for dispensing products to a purchaser without the attendance continuous of sales personnel, comprising:

  • a credit identification card;

    a first plurality of indicia of relatively high dielectric constant mounted in said card;

    a second plurality of indicia of relatively low dielectric constant mounted in said card in a predetermined pattern with said first plurality;

    means for sensing the electrical time constant characteristics of said indicia and providing a binary code output representative thereof;

    means for manually selecting a digital code memorized and known by the purchaser to be identical to the code represented by the pattern on said card;

    means for converting the digital code to a binary code;

    means for comparing said two binary codes; and

    enabling means responsive to coincidence between said two codes to enable the operation of said vending machine.

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