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:
Mar. 27, 2007
Filed:
Oct. 22, 2001
Rüdiger Kreuter, Darmstadt, DE;
Rüdiger Kreuter, Darmstadt, DE;
DataCard Corporation, Minnetonka, MN (US);
Abstract
A method of checking the authenticity of a perforation pattern which serves as a security feature and which when viewed in daylight back-lighting shows image information in the substrate of a document in particular in card form, wherein both the front side and also the rear side of the substrate is viewed in the region of the perforation pattern under incident light with light of a defined wavelength and in that case the image which is inherent to the perforation pattern shows on the front side while on the rear side thereof an area corresponding to the region of the perforation pattern shows up only in unspecified fashion.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile