发明名称 |
Method for embedding and recovering machine-readable information |
摘要 |
Disclosed is a method of embedding and recovering machine readable information on a substrate which comprises (a) writing data in a predetermined machine readable code format on the substrate with a photochromic marking material having a first state corresponding to a first absorption spectrum and a second state corresponding to a second absorption spectrum; and (b) thereafter effecting a photochromic change in at least some of the photochromic marking material from the first state to the second state.
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申请公布号 |
US5710420(A) |
申请公布日期 |
1998.01.20 |
申请号 |
US19950567786 |
申请日期 |
1995.12.05 |
申请人 |
XEROX CORPORATION |
发明人 |
MARTIN, TREVOR I.;OLIVER, JOHN F. |
分类号 |
G06K19/06;(IPC1-7):G06K19/06 |
主分类号 |
G06K19/06 |
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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