Sheet material comprising at least one watermark having a colored shade
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United States of America Patent
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May 22, 2012
Grant Date -
Dec 10, 2009
app pub date -
Feb 9, 2007
filing date -
Feb 9, 2006
priority date (Note) -
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Abstract
The present invention relates to a sheet material comprising at least one first layer defining an outer surface of the sheet material and having at least one first color, at least one second layer comprising at least one watermark and having at least one second color, the first and second colors having at least different saturations and/or hue angles.
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