Security devices

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United States of America Patent

PATENT NO 8820793
APP PUB NO 20130113200A1
SERIAL NO

13504607

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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Improvements in security devices are provided that are used for authenticating or security applications. The security device includes a first color-shifting layer and a second color-shifting layer, which exhibits different reflective characteristics to the first color-shifting layer. A partial first light absorbing layer is between first surfaces of the first and second color-shifting layers and a second light absorbing layer applied to a second surface of the second color-shifting layer. The color of the partial first absorbing layer is selected to substantially match the color of light reflected at a normal angle of incidence by the combination of the second color-shifting layer and the second absorbing layer.

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Patent Owner(s)

Patent OwnerAddress
DE LA RUE INTERNATIONAL LIMITEDBASINGSTOKE HAMPSHIRE RG22 4BS

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Lister, Adam Andover, GB 19 120

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