The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 03, 2004
Filed:
Mar. 18, 2002
Oliver Muth, Berlin, DE;
Helge Brockmann, Boll, DE;
Wolfgang Schmidt, Berlin, DE;
Anett Bailleu, Berlin, DE;
Gabriele Brauer, Berlin, DE;
Manfred Paeschke, Basdorf, DE;
Benedikt Ahlers, Berlin, DE;
Arnim Franz-Burholz, Falkensee, DE;
Hans Zerbel, Berlin, DE;
Bundesdruckerei GmbH, Berlin, DE;
Abstract
The present invention provides a secured document including a composition capable of anti-Stokes fluorescence containing an ion capable of absorption of electromagnetic radiation, an ion capable of emitting electromagnetic radiation, and a matrix composition comprising gadolinium, yttrium, lanthanum, and thulium, wherein the wavelength of the absorbed electromagnetic radiation is shorter than the wavelength of the emitted of the absorbed electromagnetic radiation, and wherein the concentrations of the absorbing and emitting ions are adjusted to achieve concentration quenching of anti-Stokes luminescence.