| 发明名称 |
SECURITY DISPLAY DEVICES, THEIR PRODUCTION AND USE |
| 摘要 |
Security documents often incorporate security devices to prevent or hinder counterfeiters. Disclosed herein are security devices that include a fluid or fluids within the devices. Such devices, and security documents that include them, afford new techniques to check whether a security document is a legitimate or counterfeit copy. |
| 申请公布号 |
EP2758253(A4) |
申请公布日期 |
2015.07.01 |
| 申请号 |
EP20120833703 |
申请日期 |
2012.09.19 |
| 申请人 |
BANK OF CANADA |
发明人 |
MACPHERSON, CHARLES DOUGLAS;GARANZOTIS, THEODOROS |
| 分类号 |
B82Y20/00;B42D25/00;B42D25/29;B42D25/364;B42D25/369;G02B26/00;G07D7/12 |
主分类号 |
B82Y20/00 |
| 代理机构 |
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代理人 |
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