| 发明名称 |
Method of preventing erasure of an image and a booklet of security papers. |
| 摘要 |
<p>A method of preventing erasure of an image produced from an erasable ballpoint pen or a correctable typewriter by writing or typing the image upon a surface coated with an adsorbent inorganic material, such as a montmorillonite acid clay. Such a method prevents fraudulent alteration of security papers.</p> |
| 申请公布号 |
EP0029714(A1) |
申请公布日期 |
1981.06.03 |
| 申请号 |
EP19800304166 |
申请日期 |
1980.11.20 |
| 申请人 |
THE WIGGINS TEAPE GROUP LIMITED |
发明人 |
COLE, DENNIS |
| 分类号 |
B44F1/12;D21H17/00;D21H21/46;(IPC1-7):21H5/10 |
主分类号 |
B44F1/12 |
| 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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