Security device
AssigneeDe La Rue International Limited
InventorsKenneth John Drinkwater, Marianne Michelle Anton, Ralph Kay
Life of this patent
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Abstract
A security device comprises an optically variable effect generating structure (3,4). An obscuring layer (7) is located, in use, between the optically variable effect generating structure and a substrate (8) to which the device is secured. A color layer (6) is also included which exhibits one or more predetermined colors when viewed under certain viewing conditions from the side of the device remote from the obscuring layer. The obscuring layer (7) is substantially opaque under the said certain viewing conditions.
Claims23
A security device comprising an optically variable effect generating structure;
- an obscuring layer located, in use, between the optically variable effect generating structure and a substrate to which the device is secured;
- and a color layer which exhibits one or more predetermined colors when viewed under certain viewing conditions from the side of the device remote from the obscuring layer, and wherein the obscuring layer is substantially opaque under the certain viewing conditions.
Dependencies are inferred from the claim text.