Tamper-evident envelope with indicia underlying cohesive layers
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United States of America Patent
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-
Nov 24, 1987
Grant Date -
N/A
app pub date -
Dec 24, 1985
filing date -
Dec 24, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An envelope with a pressure sensitive seal containing a hidden printed message which is revealed when the seal has been opened. The unsealed edges of the envelope each have an anchor coating, and the message is formed by voids in the anchor coating on one edge. Cohesive layers adhere to the anchor coatings on both edges, and seal the envelope as desired. The cohesive layers have a stronger affinity for each other than for the anchor coating with the void regions, and so the message is revealed as the cohesive layer separates from the void-containing anchor coating when the sealed envelope is opened.
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Family
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Cited Art Landscape
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