PROTECTIVE STRIP AND SECURED DOCUMENT CONTAINING SUCH STRIP Russian patent published in 2018 - IPC B42D25/355 B42D25/373 

FIELD: document security.

SUBSTANCE: invention relates to the field of finance, in particular to banknotes and methods for preventing counterfeiting. In the method, a protective strip is proposed, intended for a partial inclusion in the structure of a secured document, said strip projects onto the surface of said document in the form of a set of windows and comprises a transparent or translucent substrate material coated on one or the other of its opposite sides with at least three different and superimposed layers (51, 52, 53). Second intermediate layer (52) has an optical characteristic different from the optical characteristic of first and third layers (51, 53), wherein second intermediate layer (52) is opaque and comprises at least two regions (520) that are at least partially uncoated, these two regions (520) having different contours, respectively. First (51) and third (53) layers comprise at least one pattern, wherein a portion of the pattern of first layer (51) can be seen through one of the two areas, which at least partially do not have a coating, while at least a portion of the pattern of third layer (53) can be seen through the other of the two areas, which at least partially do not have a coating, the patterns being different from each other.

EFFECT: increased reliability of preventing counterfeits.

9 cl, 21 dwg