Optically variable security attribute
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Nov 27, 2007
Grant Date -
N/A
app pub date -
Jun 14, 2000
filing date -
Jun 15, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to an optically variable security attribute for documents, securities, bank notes, packaging and goods.The task of the invention is to provide an optically variable security attribute with covert detectable characteristics to improve safety against counterfeiting. In accordance with the invention, the task is accomplished in an optically variable security attribute with diffractive structures consisting of an electrically conductive polymer and at least one support web (1), a protection layer (7), a lacquer layer (3) and a reflection layer (4) by the electrically conductive polymer being polyethylenedioxythiophene polystyrenesulfunate (PEDT/PSS).
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