OPTICALLY CHANGING ELEMENT WITH A SERIES OF THIN-FILM LAYERS Russian patent published in 2007 - IPC B42D15/10 B44F1/12

Abstract RU 2309050 C2

FIELD: optically changing elements, in particular, optically changing protective elements for protecting bank notes, credit cards, documents or products.

SUBSTANCE: optically changing element contains thin-film layer for creating color change by means of interference, and also an additional layer. Thin film is made in form of partial thin-film element, which covers surface area of additional layer only locally and with creation of a pattern.

EFFECT: high degree of forgery protection of product being protected.

3 cl, 13 dwg

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RU 2 309 050 C2

Authors

Vild Khajnrikh

Brem Ljudvig

Dates

2007-10-27—Published

2003-04-17—Filed