Security device and method
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United States of America Patent
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Mar 27, 2012
Grant Date -
Jul 1, 2010
app pub date -
Jun 12, 2008
filing date -
Jul 19, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A security device comprises a substrate having a viewing region. A first pattern of a first color and a second pattern of a second color are printed on one side of the viewing region. A third pattern of the first color and a fourth pattern of the second color are printed on the other side of the viewing region. The first and second patterns on the one side of the viewing region overlap the fourth and third patterns respectively on the other side of the viewing region whereby
- a) when each side of the viewing region is viewed in reflected light, the patterns on that side can be distinguished by at least their colors, andb) when the viewing region is viewed in transmitted light, from either side of the substrate, the viewing region is sufficiently transparent that subtractive color mixing between the overlapped different colors results in a perceived single resultant color being visible.
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