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US 5,783,275 AGranted
Antifalsification paper
AssigneeGiesecke & Devrient GmbH
InventorsHajo Muck, Siegfried Harms
Life of this patent
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AssigneeGiesecke & Devrient GmbH
InventorsHajo Muck, Siegfried Harms
Estimating the term…
An antifalsification paper is described having an embedded safeguarding thread which is embedded in the paper so as to be freely accessible in some areas. The safeguarding thread has a width greater than 2 mm. The antifalsification paper comprises at least two paper layers produced on separate paper machines. The safeguarding thread is embedded in the first paper layer which has openings or recesses in its surface through which the thread is partly accessible on both sides. This first paper layer is covered with at least one second paper layer and firmly connected therewith, the second paper layer having a thickness of 10 to 50%, preferably 20%, of the total thickness of the antifalsification paper. The use of particularly wide safeguarding threads and the resulting possibility of equipping the threads with certain optical effects can improve the resistance to forgery of the antifalsification paper provided therewith.
A security document comprising first and second paper layers laminated together to form a document having a total thickness and a security band partially imbedded in the first paper layer, said first paper layer including at least one window in one side thereof extending to said security band, said first paper layer including randomly distributed flaw openings located in the side of the first paper layer opposite the side including said at least one window, said flaw openings also extending to and exposing said security band;
In a method of producing a security document including forming a first paper web from a furnish on a wire mesh and imbedding a security band in the first paper web during formation of the first web in a manner that leaves at least one window in at least one of the surfaces of the first paper web through which the security band is exposed, the improvement comprising:
In a method of producing a security document including forming a first paper web layer having first and second opposed surfaces from a furnish using a wire mesh and imbedding an elongated security band in the first paper layer during formation of the first paper layer, the improvement comprising:
Dependencies are inferred from the claim text.