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US 2011/0215561 A1Published application
Method of authenticating a security document comprising a thermochromic element and data containing temperature information, and associated security document
AssigneeArjowiggins Security
InventorsHenri Rosset, Philippe Dietemann
Life of this patent
Estimating the term…
Abstract
Security document including at least one thermochromic element able to change appearance at at least one predefined temperature, and at least one indication on the document, associated with said at least one thermochromic element, giving information on the change-of-appearance temperature of said at least one thermochromic element.
Claims21
1-19. (canceled)
A method of authenticating a security document, the security document comprising:
- at least one thermochromic element able to change appearance at least at one predefined temperature;
- and
- at least one indication on the document, associated with said at least one thermochromic element, giving information on the change-of-appearance temperature of said at least one thermochromic element, the method comprising:
- comparing the indication giving information on the change-of-appearance temperature of said at least one thermochromic element with the actual change-of-appearance temperature of said at least one thermochromic element.
1 more element
A security document, comprising:
- at least one thermochromic element able to change appearance at least at one predefined temperature;
- and
- at least one indication on the document, associated with said at least one thermochromic element, giving information on the change-of-appearance temperature of said at least one thermochromic element.
A security document, comprising:
- a temperature-indicating element extending from one edge of the security document to the other and comprising at least one thermochromic element able to change appearance at a predefined temperature;
- and
- at least one indication associated with said at least one thermochromic element, giving information on the change-of-appearance temperature of said at least one thermochromic element.
A security document, comprising:
- one or more thermochromic elements all changing appearance at one and only one predefined temperature;
- at least one indication on the document, associated with the thermochromic element or elements, giving information on the one and only one change-of-appearance temperature of the thermochromic element or elements.
Dependencies are inferred from the claim text.