Spectral coding by fluorescent semiconductor nanocrystals...

Registers – Records – Fluorescent – phosphorescent – radiation emitting

Reexamination Certificate

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Reexamination Certificate

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07077329

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.

REFERENCES:
patent: 6576155 (2003-06-01), Barbera-Guillem
patent: 6721471 (2004-04-01), MacKinnon
patent: 6774361 (2004-08-01), Bawendi et al.
patent: 2002/0021003 (2002-02-01), McGrew
patent: 2003/0047100 (2003-03-01), Brown et al.
Han, Mingyong et al., “Quantum-dot-tagged microbeads for multiplexed optical coding of biomolecules”, Nature Publishing Group, vol. 19, 2001.
Chan, Warren C.W. et al., “Luminescent quantum dots for multiplexed biological detection and imaging”.

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