| 发明名称 |
Laser cancellation of postage stamps |
| 摘要 |
A method of processing postal items in which a postage stamp 13 includes a dye which changes colour when subjected to a low power CO2 laser 14. The colour change results in a mark 11, indicating cancellation of the postage stamp 13. |
| 申请公布号 |
GB2439164(A) |
申请公布日期 |
2007.12.19 |
| 申请号 |
GB20070007374 |
申请日期 |
2007.04.05 |
| 申请人 |
ROHAN KANISHKA ANANDA APPUHANNADITOTA HEWAGE |
发明人 |
ROHAN KANISHKA ANANDA APPUHANNADITOTA HEWAGE |
| 分类号 |
G07B17/00 |
主分类号 |
G07B17/00 |
| 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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