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United States of America Patent
Stats
-
Apr 15, 1986
Grant Date -
N/A
app pub date -
May 8, 1984
filing date -
May 8, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A protected document includes background printed background matter and line pattern printed warning indicia. The warning indicia is slurrable upon copying to become visible.
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Cited Art Landscape
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