Method and device for the secure protection of an official document and official document thus protected
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United States of America Patent
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Mar 26, 2019
Grant Date -
Mar 31, 2016
app pub date -
May 12, 2014
filing date -
May 13, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A method for the secure protection of a portion of the surface of an official document bearing markings, in which: a transparent security layer (17) is selected, the layer including at least one semi-transparent printed image including at least one transparent binder and at least one thermochromic pigment (14, 13, 12, 11); the semi-transparent printed image reveals at least one semi-transparent visible pattern in a first non-activated state at least a first temperature, such that the markings can be seen through the image, the pattern not being visible in a second activated state at least a second temperature different from the first temperature. A device for the secure protection of a portion of the surface of an official document and such an official document are also described.
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