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US 10,328,738 B2Granted
Security element comprising a masking structure containing a mixture of nanometric fillers
AssigneeOberthur Fiduciaire SAS
InventorsJacques Machizaud, Aurelie Maman, Michel Camus
Life of this patent
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Abstract
A security element, preferably a security wire, for a secure document, may include a masking structure for reducing the visibility of a surface of the element when the latter is located inside the document or on the surface thereof, the masking structure comprising a mixture of at least two nanometric fillers.
Claims23
A security element for a secured document, comprising:
- a security structure comprising an opaque layer, the opaque layer comprising at least one opening;
- and
- a masking structure, superposed at least partially on the security structure, for decreasing visibility of a surface of the security element in reflected light, the security element being present within the secured document or on a surface of the secured document, the masking structure comprising a mixture of at least two nanoscale fillers of one or more pulverulent compounds, a D50 average size of the at least two nanoscale fillers ranging from 1 nm to 1000 nm, and one of said at least two nanoscale fillers comprising pyrogenated colloidal silica, wherein the security element is visible under transmitted light through the masking structure.
Dependencies are inferred from the claim text.