Security document and method for making same using an alternating dot pattern
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United States of America Patent
Stats
-
Sep 28, 1982
Grant Date -
N/A
app pub date -
Oct 11, 1979
filing date -
Oct 11, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved copy-proof document is disclosed having a cancellation phrase with an alternating dot pattern which enhances both the detail rendition and protection of such documents. The method of making such a document by preprinting the cancellation phrase in a single tone pattern of alternating dot sizes is also disclosed.
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Family
International Classification(s)
Cited Art Landscape
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