US 5,509,691 AGranted

Security element in the form of threads or strips to be embedded in security documents and a method for producing and testing the same

AssigneeGAO Gesellschaft fur Automation und Organisation mbH

InventorsWittich Kaule, Wilhelm Ilgmann, Gerhard Schwenk, Gerhard Stenzel

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Abstract

A security element that can be embedded in the form of a thread or strip in a security document, in particular a paper of value, is composed of two carrier sheets, each of which bears each of the marking substances allowing for detection of authenticity. The two carrier sheets are put together in such a way that the marking substances to be protected from mechanical abrasion and other external influences come to lie on the inside. The thread not only offers special protection for the marking substances, but can also be embedded in the paper substance easily due to its symmetrical structure and without showing any tendency to curl.

Claims5

Dependent claims

A method for producing a security element in the form of a thread or strip to be embedded in the security document comprising a carrier sheet and at least one marking substance applied thereto to allow for visual and or machine detection of authenticity, characterized by the steps of

preparing a plastic sheet,
providing this plastic sheet with the substance allowing for detection of authenticity,
producing a second, similarly pretreated sheet,
providing at least one of the sheets with a laminating adhesive on a side provided with marking substance,
superimposing the two sheets with their sides provided with marking substance or with the adhesive layer facing each other, and gluing them together, and
cutting the security elements out of this two ply stretch of sheet in the necessary strip or thread width.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/192,610Filed 7 Feb 1994 · continuation
Priority: 26 Oct 1992
Granted: 23 Apr 1996
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B32B 7/12
Interconnection of layers: using interposed adhesives or interposed materials with bonding properties
B32B 27/00
Layered products comprising a layer of synthetic resin
B32B 27/36
Layered products comprising a layer of synthetic resin: comprising polyesters