Back to results
US 6,903,850 B2Granted
Security device
AssigneeDe La Rue International Limited
InventorsRalph Kay, Brian William Holmes
Life of this patent
Estimating the term…
Abstract
A security device has a substrate formed with a surface relief defining an optically variable effect generating structure. At least two different reflection enhancing materials are provided on, or on the same side of, substrate with respect to the surface relief, whereby the optically variable effect can be viewed against a background defined by the reflection enhancing materials.
Claims24
A security device, comprising:
- a substrate formed with a surface relief defining an optically variable effect generating structure;
- and
- at least two different opaque reflection enhancing materials, at least one of which is discontinuous, on the same side of the substrate with respect to the surface relief, each of the at least two reflection enhancing materials having the surface relief profile and having different hues, whereby the optically variable effect can be viewed against a background defined by the at least two reflection enhancing materials.
Dependencies are inferred from the claim text.