发明名称 |
Double-blind security features |
摘要 |
A compound security feature is formed by printing latent images together with visually integrated settings using an invisible ink. Even if illuminated by a wavelength capable of rendering the inks visible, the latent images remain visually indistinguishable from their visually integrated settings. However, the latent images and visually integrated settings differ in one or more less obvious ways so that the latent images can be distinguished by using a visual aid.
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申请公布号 |
US7976068(B2) |
申请公布日期 |
2011.07.12 |
申请号 |
US20070741513 |
申请日期 |
2007.04.27 |
申请人 |
DOCUMENT SECURITY SYSTEMS, INC. |
发明人 |
WICKER THOMAS M.;WICKER DAVID M.;CATON MICHAEL SCOTT |
分类号 |
B42D15/00;B42D15/10 |
主分类号 |
B42D15/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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