Method of producing a security document
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United States of America Patent
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Jun 11, 2002
Issued Date -
N/A
app pub date -
Mar 13, 2000
filing date -
Jun 11, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
One aspect of the present invention provides a method of producing a security document, including the steps of: (a) forming a sheet-like substrate of plastics material having first and second opposing surfaces, (b) coating a first layer of polymer material containing magnetic particles on the first opposing surface, (c) melting at least a portion of the first layer such that the magnetic particles can orient under the influence of a magnetic field, (d) applying the magnetic field so as to form a magnetic watermark, and (e) allowing the first layer portion to cool so as to fix the orientation of the magnetic particles
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