Security document and method using invisible coded markings
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United States of America Patent
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-
Oct 31, 2000
Grant Date -
N/A
app pub date -
Jan 5, 1998
filing date -
Nov 5, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An invisible indicia or encoded information is imprinted on a substrate using a compound which produces a fluorescence at a wavelength greater than about 650 nm when exposed to near infrared radiation. The information covered by a layer of material that reflects or absorbs a substantial amount of the visible and UV radiation illuminating its surface.
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