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Security document and method for making same using an alternating dot pattern

  • US 4,351,547 A
  • Filed: 10/11/1979
  • Issued: 09/28/1982
  • Est. Priority Date: 10/11/1979
  • Status: Expired due to Term
First Claim
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1. An improved security document comprising:

  • a substrate having a top surface for carrying indicia;

    background printed matter on said top surface, said background printed matter made up of a pattern of small elements of substantially the same size and of a uniform frequency; and

    ,a cancellation term also printed on said top surface of said substrate, said cancellation term composed of an area pattern consisting of at least two sizes of elements uniformly spaced in an intermingling, alternating pattern and occurring with the same combined contiguous frequency as said elements of said background printed matter.

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  • 6 Assignments
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