Security device
First Claim
1. A security device comprising a substrate having a viewing region which is provided on one side with first indicia and on the other side with second indicia overlying the first indicia, the substrate carrying an obscuring material aligned with the second indicia so as to prevent at least the second indicia from being viewed from the one side of the substrate under reflected radiation, the substrate being sufficiently transparent and the obscuring material permitting passage of sufficient transmitted radiation to allow the second indicia to be viewed from the one side of the substrate under transmission conditions, characterised in that the obscuring material is positioned between the first and second indicia.
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Accused Products
Abstract
A security device comprises a substrate (1) having a viewing region (3) which is provided on one side with first indicia (7) and on the other side with second indicia (9) overlying the first indicia. The substrate carries an obscuring material (10) aligned with the second indicia (9) so as to prevent at least the second indicia from being viewed from the one side of the substrate under reflected radiation. The substrate is sufficiently transparent while the obscuring material permits the passage of sufficient transmitted radiation to allow the second indicia (9) to be viewed from the one side of the substrate under transmission conditions.
149 Citations
46 Claims
- 1. A security device comprising a substrate having a viewing region which is provided on one side with first indicia and on the other side with second indicia overlying the first indicia, the substrate carrying an obscuring material aligned with the second indicia so as to prevent at least the second indicia from being viewed from the one side of the substrate under reflected radiation, the substrate being sufficiently transparent and the obscuring material permitting passage of sufficient transmitted radiation to allow the second indicia to be viewed from the one side of the substrate under transmission conditions, characterised in that the obscuring material is positioned between the first and second indicia.
- 7. A security device comprising a substrate including a viewing region which is provided with first indicia on one side of the substrate and second indicia on the other side of the substrate overlapping the first indicia, wherein at one orientation of viewing the substrate from the one side under transmitted radiation, the first indicia obscure the second indicia, and at another orientation the second indicia are visible through the first indicia, characterized in that the first and second indicia comprise dots.
- 11. A security device comprising a substrate including a viewing region which is provided on one side with first indicia and on the other side with second indicia overlying the first indicia, wherein the first and second indicia can both be seen when the device is viewed from one side of the substrate under transmitted radiation, the first and second indicia cooperating together to generate an image different from an appearance of the first and second indicia individually, each of the first and second indicia comprising at least one block, the block(s) of one indicia overlapping the block(s) of the other indicia, and the blocks of the first and second indicia having different colours.
Specification