Latent images comprising phase shifted micro printing
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United States of America Patent
Stats
-
Jan 12, 1993
Grant Date -
N/A
app pub date -
Jun 25, 1991
filing date -
Jun 25, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A security device comprising a substrate having applied thereto an array of characters, the characters being of a sufficiently small size as to appear uniform when ordinarily viewed but individually identifiable when viewed with the aid of appropriate magnification means, whereby group(s) of the characters are phase-shifted relative to the others in such a manner as to collectively define an image, the image being relatively indiscernible when the device is ordinarily viewed but discernible when viewed with the aid of a finding screen.
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Family
International Classification(s)
Cited Art Landscape
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