| 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 |
US9327538(B2) |
申请公布日期 |
2016.05.03 |
| 申请号 |
US200611325998 |
申请日期 |
2006.01.05 |
| 申请人 |
PPG Industries Ohio, Inc. |
发明人 |
Munro Calum H.;Merritt Mark D.;Purdy Sean |
| 分类号 |
B42D15/00;B42D15/10;B41M3/10;B42D25/29;B44F1/10;B41M3/14 |
主分类号 |
B42D15/00 |
| 代理机构 |
|
代理人 |
Meder Julie W. |
| 主权项 |
1. A method of marking an article with a radiation watermark comprising:
applying an ordered periodic array of particles to an article in a configuration that marks the article, wherein the array diffracts radiation, such that radiation is reflected from the configuration as a radiation watermark at a detectable wavelength. |
| 地址 |
Cleveland OH US |
