Marking substance and security markings for testing the...

Details Marking substance and security markings for testing the... Marking substance and security markings for testing the...

2008-05-06

2008-05-06

Fridie, Jr., Willmon (Department: 3722)

Printed matter

Having revealable concealed information, fraud preventer or...

And electrically conductive material

C283S901000, C162S110000, C162S140000, C428S209000

Reexamination Certificate

active

09719881

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.

REFERENCES:
patent: 5112672 (1992-05-01), Kaule et al.
patent: 5928471 (1999-07-01), Howland et al.
patent: 6025119 (2000-02-01), Majumdar et al.

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