发明名称 |
Security document and method using invisible coded markings |
摘要 |
<p>An invisible indicia or encoded information is imprinted on a substrate using a compound which produces a fluorescence at a wavelength greater than about 650 nm when exposed to near infrared radiation. The information is covered by a layer of material that reflects or absorbs a substantial amount of the visible and UV radiation illuminating its surface.</p> |
申请公布号 |
AU5249798(A) |
申请公布日期 |
1998.06.10 |
申请号 |
AU19980052497 |
申请日期 |
1997.11.05 |
申请人 |
EASTMAN CHEMICAL COMPANY |
发明人 |
MICHAEL JOHN CYR;JAMES JOHN KRUTAK;HORST CLAUBERG;TONY W. HELTON |
分类号 |
B42D15/10;B41M3/14;B42D15/00 |
主分类号 |
B42D15/10 |
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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