Security feature

Details Security feature Security feature

2006-12-26

2009-12-01

Koslow, C. Melissa (Department: 1793)

Compositions

Organic luminescent material containing compositions

C252S30140F, C252S30140R, C428S402000, C428S404000, C428S406000

Reexamination Certificate

active

07625500

ABSTRACT:
A security feature having unique photoluminescent properties and a method for making the security feature. The security feature includes a silica carrier and a rare earth dopant dispersed throughout at least a portion of the silica carrier. The rare earth dopant includes a rare earth ion to which ligands and/or inorganic sensitizers are associated. The ligands and/or inorganic sensitizers are positioned to absorb energy and transfer the absorbed energy to the rare earth ion.

REFERENCES:
patent: 5961923 (1999-10-01), Nova et al.
patent: 6006582 (1999-12-01), Bhandari et al.
patent: 2007/0026407 (2007-02-01), Matsumoto et al.
patent: 2004-325432 (2004-11-01), None
patent: 10-0620959 (2006-08-01), None
patent: WO 2005/023961 (2005-03-01), None
English Language, Abstract of KR 10-0620959 B1 as provided to Applicant in an e-mail from Doohan Chung of the Korean Intellectual Property Office dated Aug. 14, 2008.

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