Security thread
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United States of America Patent
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Jul 11, 2017
Grant Date -
Apr 17, 2014
app pub date -
Dec 19, 2013
filing date -
Jun 23, 2011
priority date (Note) -
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Abstract
An anti-counterfeiting security thread for incorporation into documents and banknotes. The security thread has at least two zones located respectively on either side of a separation line extending longitudinally along the thread. Two optically variable security elements having different appearances are disposed in the first zone and second zones of the security thread. The optically variable elements are arranged with respect to the separation line so that each of the two optically variable elements has a first perceived appearance from a first direction of observation and a second perceived appearance from a second direction of observation, wherein the first and the second perceived appearances are different.
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