发明名称 |
PROTECTED DOCUMENT AND METHOD OF MAKING SAME |
摘要 |
of the Invention Disclosed is a protected document such as a negotiable instrument, a title instrument, identification document or other documents which should be kept secure from illegal copying by color copiers. The method of making the document comprising preprinting a "VOID" or other warning or cancellation phrase pattern in half tone or multitone on the document and camouflaging this pattern is also disclosed. |
申请公布号 |
CA1118009(A) |
申请公布日期 |
1982.02.09 |
申请号 |
CA19780301902 |
申请日期 |
1978.04.25 |
申请人 |
BURROUGHS CORPORATION |
发明人 |
MOWRY, WILLIAM H., JR.;MCELLIGOTT, MICHAEL J.;TKALENKO, VICTOR J., JR.;BARAN, JOSEPH |
分类号 |
G06K19/10;B41M3/14;B42D15/10;B44F1/12;G03C5/08;G03G15/01;G03G21/00;G03G21/04;G07D7/20 |
主分类号 |
G06K19/10 |
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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