Spectral coding by fluorescent semiconductor nanocrystals for document identification and security applications
US7077329B2 · kind B2 · utility
3Cited by
3References
11Claims
0Family size
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Key dates
| Filing date | Jun 24, 2003 |
| Grant date | Jul 18, 2006 |
| Priority date | — |
| Expiry date | Jul 1, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06046
- WIPO fieldMicro-structural and nano-technology
- WIPO sectorChemistry
Abstract
In a method of coding and retrieving information by using the unique emission properties of the semiconductor nanocrystals (quantum dots) for the identification of valuable documents, articles and objects, a carrier medium is prepared containing quantum dots selected to give the carrier medium defined fluorescent emission characteristics encoding predetermined information. The carrier medium is then applied to the object, preferably in the form of an ink.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.