Retrochromic articles
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United States of America Patent
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May 2, 2006
Grant Date -
Oct 16, 2003
app pub date -
Apr 11, 2002
filing date -
Apr 11, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
Retrochromic articles have a retrochromic pattern comprising first and second viewable retroreflective regions, wherein at least one viewable retroreflective region comprises a plurality of intrinsically retrochromic beads. Methods for making such articles are also provided. Articles according to the present invention have covert security features, and may be used, for example, to authenticate security articles.
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