Security document having a security element embedded therein with visually and machine-testable marks
AssigneeGAO Gesellschaft fur Automation und Organisation mbH
InventorsWittich Kaule, Michael Bohm
Life of this patent
Estimating the term…
Abstract
In a security document having an embedded security element in the form of a transparent thread with electrically conductive material in at least two layers, at least one layer is transparent or partly transparent at least in certain areas. The partly transparent layer interacts with marks located on the thread in such a way that the marks are largely concealed in incident light but are recognizable visually in transmitted light.
Claims27
A security document having a security element in the form of a transparent thread or strip embedded therein bearing marks in the form of characters, printed patterns and the like that are largely concealed when viewed in incident light but are optically detectable visually or by machine in transmitted light, said transparent thread or strip including at least one electrically conductive layer providing electrical conductivity for machine testability, the improvement wherein the electrically conductive layer is made of a material that is at least partially transparent and is disposed in the optical viewing path for the marks when the marks are viewed in transmitted light.
A security document having a security element in the form of a transparent thread or strip embedded therein bearing marks in the form of characters, printed patterns and the like that are largely concealed when viewed in incident light but are optically detectable visually or by machine in transmitted light, said transparent thread or strip comprising a pair of carrier films each having an electrically conductive layer secured thereto, one of the conductive layers being formed of a material that is at least partially transparent and which is disposed in the optical viewing path for the marks when the marks are viewed in transmitted light and the other conductive layer being arranged to define said marks for optical detection in transmitted light;
- said carrier films being adhered to each other by a nonconductive adhesive layer.
A security document having a security element in the form of a transparent thread or strip embedded therein bearing marks in the form of characters, printed patterns and the like that are largely concealed when viewed in incident light but are optically detectable visually or by machine in tranmitted light, said transparent thread or strip comprising a pair of carrier films each including an electrically conductive layer formed of a material that is at least partially transparent and which is disposed in the optical viewing path for the marks when the marks are viewed in transmitted light;
- said carrier films being adhered to each other by a nonconductive adhesive layer.
A method for testing security documents containing at least one security element in the form of a transparent thread or strip embedded in said security document, said security element bearing marks in the forms of characters, printed patterns and the like that are substantially concealed when viewed in incident light but are optically detectable visually or by machine in transmitted light, and wherein said security elements include an electrically conductive layer capable of being detected electrically by machine, including the steps of:
- (a) electrically detecting the presence and location of the security element in the security document;
- and
- (b) after locating the security element in accordance with step (a), viewing the security element optically by viewing same in incident light.
A method for testing security documents containing at least one security element in the form of a transparent thread or strip embedded in said security document, said security element bearing marks in the form of characters, printed patterns and the like that are substantially concealed when viewed in incident light but are optically detectable visually or by machine in transmitted light, and wherein said security elements include an electrically conductive layer capable of being detected electrically by machine, including the steps of:
- (a) electrically detecting the presence and location of the security element in the security document;
- and
- (b) after locating the security element in accordance with step (a), viewing the security element optically by viewing same in transmitted light.
A method for testing security documents containing at least one security element in the form of a transparent thread or strip embedded in said security document, said security element bearing marks in the form of characters, printed patterns and the like that are substantially concealed when viewed in incident light but are optically detectable visually or by machine in transmitted light, and wherein said security elements include an electrically conductive layer capable of being detected electrically by machine, including the steps of:
- (a) electrically detecting the presence and location of the security element in the security document using galvanic conductivity of the security element;
- and
- (b) after locating the security element in accordance with step (a), viewing the security element optically by viewing same in incident light.
A method for testing security documents containing at least one security element in the form of a transparent thread or strip embedded in said security document, said security element bearing marks in the form of characters, printed patterns and the like that are substantially concealed when viewed in incident light but are optically detectable visually or by machine in transmitted light, and wherein said security elements include an electrically conductive layer capable of being detected electrically by machine, including the steps of:
- (a) electrically detecting the presence and location of the security element in the security document using galvanic conductivity of the security element;
- and
- (b) after locating the security element in accordance with step (a), viewing the security element optically by viewing same in transmitted light.
Dependencies are inferred from the claim text.