Documents containing information invisible to the naked eye
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United States of America Patent
Stats
-
Mar 12, 1985
Grant Date -
N/A
app pub date -
Jan 30, 1984
filing date -
Oct 28, 1976
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A document is disclosed, which contains information invisible to the naked eye, but which information can be made visible by a simple method. Said information is represented by markings on the document, which markings comprise a first color at least partially opaque to at least part of the invisible light spectrum, and a second color which serves to conceal said first color in the visible spectrum, but which second color is itself transparent to said part of the invisible light spectrum.
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Cited Art Landscape
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