Method of embossing repeating patterns on a substrate, the patterns having different rates of repetition
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United States of America Patent
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Nov 7, 1995
Issued Date -
N/A
app pub date -
Jul 29, 1994
filing date -
Dec 19, 1991
priority date (Note) -
Expired
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Abstract
In a preferred embodiment, a method of producing embossed first and second elongate, edgewise side by side, repeating, optical patterns on a sheet for use in producing secure identification means, the method comprising: continuously embossing the first and second optical patterns on the sheet, such that the first and second patterns repeat at different rates, so that the first pattern will 'walk' with respect to the second pattern.
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