Copy indicating security device
AssigneeThomas De La Rue Limited
InventorZoe M. E. Anderson
Life of this patent
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Abstract
A copy indicating security device includes at least one symbol defined by a first arrangement of print elements, the or each symbol being provided in a background defined by a second arrangement of print elements. Under normal viewing conditions the security device presents a substantially flat tint to the eye. The first and second arrangements of print elements differ from one another so that on copying the device at least one of the symbols is revealed. The perimeter of the or each symbol is generally irregular.
Claims26
A copy indicating security device including at least one symbol defined by a first arrangement of print elements, the or each symbol being provided in a background defined by a second arrangement of print elements, wherein under normal viewing conditions the security device presents a substantially flat tint to the eye and wherein the first and second arrangements of print elements differ from one another so that on copying the device at least one of the symbols is revealed and wherein the perimeter of the or each symbol is generally irregular.
A security document provided with a copy indicating security device including at least one symbol defined by a first arrangement of print elements, the or each symbol being provided in a background defined by a second arrangement of print elements, wherein under normal viewing conditions the security device presents a substantially flat tint to the eye and wherein the first and second arrangements of print elements differ from one another so that on copying the device at least one of the symbols is revealed and wherein the perimeter of the or each symbol is generally irregular.
Dependencies are inferred from the claim text.