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. 20, 2001
Filed:
Mar. 10, 1999
Applicant:
Inventors:
Gerrit L. Verschuur, Lakeland, TN (US);
Franz Hrubes, Rotthalmuenster, DE;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06K 7/10 ;
U.S. Cl.
CPC ...
G06K 7/10 ;
Abstract
Barcode patterns or other meaningful patterns are printed with a differentially conductive ink. A sensor incorporating a plurality of capacitive couplings distinguishes features of the patterns by comparative measurements that are largely independent of variations between the sensor and the patterns affecting all of the couplings. The patterns can be distinguished despite being hidden from view, such as inside sealed envelopes.