MULTI-LAYER FILM DEPICTING A COLOUR TWO-DIMENSIONAL IMAGE WHICH IS ONLY VISIBLE THROUGH A POLARIZING FILTER AND PROCESS FOR MAKING THE FILM
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United States of America Patent
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Issued Date -
Dec 15, 2011
app pub date -
Dec 23, 2009
filing date -
Dec 23, 2008
priority date (Note) -
Abandoned
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Abstract
A multi-layer film (1), depicting a colour two-dimensional image which is only visible through a polarizing filter comprises an optically active layer (2) placed over a polarizing layer (3) and configured to form the image on its face opposite the polarizing layer (3) when said face is seen through the polarizing filter, the optically active layer (2) comprising a plurality of sheets (4) of optically active material placed over each other, at least one of which is shaped to form at least one portion of the outline of the image.
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