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:
May. 26, 2009
Filed:
Jul. 24, 2003
Applicants:
Karlheinz Mayer, Augsburg, DE;
Reinhard Plaschka, Windach, DE;
Georg Depta, Rosenheim, DE;
Inventors:
Assignee:
Giesecke & Devrient GmbH, Munich, DE;
Primary Examiner:
Int. Cl.
CPC ...
G06K 7/14 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention relates to a method, in which from two images of a security element, which are recorded with right-handed and left-handed circularly polarizing filters, a differential image is produced, on the basis of which the authenticity of the security element is tested, and an apparatus for carrying out the method.
Mayer, Karlheinz. (2009). Method and device for checking authenticity of a security element (U.S. Patent No. 7537161). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/7537161
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile