Invention Grant
- Patent Title: Security devices
- Patent Title (中): 安全设备
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Application No.: US13504607Application Date: 2010-10-29
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Publication No.: US08820793B2Publication Date: 2014-09-02
- Inventor: Adam Lister
- Applicant: Adam Lister
- Applicant Address: GB Basingtoke, Hampshire
- Assignee: De La Rue International Limited
- Current Assignee: De La Rue International Limited
- Current Assignee Address: GB Basingtoke, Hampshire
- Agency: Ohlandt, Greeley, Ruggiero & Perle, LLP
- Priority: GB0919138.8 20091030
- International Application: PCT/GB2010/002008 WO 20101029
- International Announcement: WO2011/051682 WO 20110505
- Main IPC: B42D15/00
- IPC: B42D15/00

Abstract:
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.
Public/Granted literature
- US20130113200A1 SECURITY DEVICES Public/Granted day:2013-05-09
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