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. 06, 2008
Filed:
Jun. 15, 1999
Applicants:
Frank Puttkammer, Coswig, DE;
Monika Puttkammer, Coswig, DE;
Gunther Zscherpe, Sosa, DE;
Inventors:
Assignee:
WHD Elektronische Prueftechnik GmbH, Dresden, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B42D 15/00 (2006.01); D21F 11/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention relates to a marking substance for security documents of the kind difficult to discern by counterfeiters. The preferred marking substance is polyethylene dioxythiophene polystyrene sulfonate and, more particularly, PEDT/PSS of the CPP105 formulation.