发明名称 |
BRAGG DIFFRACTING SECURITY MARKERS |
摘要 |
A method of marking an article with a watermark that diffracts radiation according to Bragg's law is disclosed. The watermark includes a periodic array of particles fixed in a matrix. The watermark may change colors with viewing angle, disappear and reappear with viewing angle or may diffract non-visible radiation that is detectable at certain angles of detection. |
申请公布号 |
HK1125075(A1) |
申请公布日期 |
2011.02.25 |
申请号 |
HK20090103270 |
申请日期 |
2009.04.07 |
申请人 |
PPG INDUSTRIES OHIO, INC. |
发明人 |
CALUM H. MUNRO;MERRITT D. MERRITT;SEAN PURDY |
分类号 |
B41M;G03F |
主分类号 |
B41M |
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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