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:
Aug. 30, 2011
Filed:
Dec. 01, 2004
Matthias Bergmann, Vogtareuth, DE;
Günter Endres, München, DE;
Georg Kruse, Aschheim, DE;
Giesecke & Devrient GmbH, München, DE;
Abstract
The invention relates to a data carrier into which, by a laser beam, identifiers () are introduced in the form of patterns, letters, numbers and/or images that are visible due to local changes in the optical properties of the data carrier, effected by the laser beam and resulting from material transformations. According to the present invention, the data carrier comprises a laser-sensitive recording layer () that is transparent in the visible spectral range and that is provided with a surface relief in the form of a lens grid (). The identifiers are introduced with the laser beam from different directions through the lens grid () into the recording layer () and are perceptible when later viewed from those same directions. The data carrier is transparent at least in the area of the introduced identifiers ().