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:
Jan. 20, 2015
Filed:
Apr. 05, 2005
Georg Depta, Rosenheim, DE;
Christof Baldus, Munich, DE;
Karlheinz Mayer, Augsburg, DE;
Peter Schiffmann, Freising, DE;
Georg Depta, Rosenheim, DE;
Christof Baldus, Munich, DE;
Karlheinz Mayer, Augsburg, DE;
Peter Schiffmann, Freising, DE;
Giesecke & Devrient GmbH, Munich, DE;
Abstract
The invention relates to a value document, especially a banknote, having a sequence of layers into which visually and/or mechanically perceptible identifiers in the form of patterns, letters, numbers or images are introduced by the action of laser radiation. According to the present invention, the sequence of layers includes a marking layer () composed of an ink mixture () exhibiting a laser-radiation-absorbing mixture component () and a laser-radiation-transparent mixture component (), the identifiers being visually and/or mechanically perceptible due to an irreversible change in the optical properties of the ink mixture (), effected by the action of the laser radiation.