Anti-counterfeiting see-through moire security feature using frequency-varying patterns
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United States of America Patent
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Sep 30, 2008
Grant Date -
May 6, 2004
app pub date -
Oct 30, 2002
filing date -
Oct 30, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Frequency varying patterns are aligned on the front and back surfaces of a document to provide an anti-counterfeiting security device. The frequency varying patterns are reversed images. The document is sufficiently transparent to allow see-through of the pattern on the back of the document to be superimposed on the pattern on the front of the document. The frequency varying patterns will form a moire pattern if misaligned, regardless of the magnitude and the orientation of the misalignment.
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