Marking substance and security markings for testing the authenticity of documents

United States of America Patent

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May 6, 2008
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N/A
app pub date
Jun 15, 1999
filing date
Jun 16, 1998

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Expired

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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.

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Patent Owner(s)

Patent Owner	Address
WHD ELECTRONISCHE PRUEFTECHNIK	INDUSTRIESTRASSE 19 D-01129 DRESDEN

International Classification(s)

B42D:BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER O....

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Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Puttkammer, Frank	Coswig, DE	12	119
Puttkammer, Monika	Coswig, DE	1	1
Zscherpe, Gunther	Sosa, DE	1	1

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Marking substance and security markings for testing the authenticity of documents

Number of patents in Portfolio can not be more than 2000

United States of America Patent

09719881

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PATENT NO	7367592
SERIAL NO	09719881
DOCKET NO

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09719881

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