Sheet printed with invisible inks, developers and erasure compounds _for invisible inks
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United States of America Patent
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-
Oct 16, 1984
Issued Date -
N/A
app pub date -
Mar 2, 1982
filing date -
Dec 2, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a developable surface comprising a carrier layer having thereon at least two deposits of one or more invisible inks in adjacent or overlapping relationship, said deposits in the developed state being unresolvable.
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Cited Art Landscape
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