Security documents
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United States of America Patent
Stats
-
Oct 3, 2000
Grant Date -
N/A
app pub date -
Jul 1, 1999
filing date -
Nov 7, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method of manufacturing a composite security thread, e.g. for a bank note, is produced by coating aluminium film onto a polyester film and coating selected regions with magnetic material. Photoresist characters are next printed onto the magnetic material, and a chemical applied to remove the aluminium coating except where protected by the resist. An obscuring silver coating is then applied over the magnetic material, and a final transparent material applied as a barrier to reduce the risk of damage during subsequent processing.
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Family
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Cited Art Landscape
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