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US 8,187,998 B2Granted
Document and method of manufacturing a document
AssigneeU-NICA Technology AG
InventorsHorst J. Lindemann, Samuel Schindler
Life of this patent
Estimating the term…
Abstract
A document has a carrier layer and at least a functional layer. The functional layer is provided with a content of bacteriorhodopsin as color pigment and, when the document is printed generating an essentially irreversible color change in the area of the bacteriorhodopsin by a supply of energy.
Claims12
A document comprising:
- a carrier layer;
- and
- at least a first functional layer, the first functional layer being a thermosensitive layer such that printing of the document with a thermal print head causes a blackening in the first functional layer, the first functional layer further comprising bacteriorhodopsin as a color pigment, such that heat generated by printing of the document with said thermal print head further causes at least some of the bacteriorhodopsin in the first functional layer to irreversibly change its color.
A method for manufacturing a document, the method comprising:
- fixing at least a first functional layer to a carrier layer, the first functional layer being a thermosensitive layer which additionally comprises bacteriorhodopsin, and
- printing the document with a thermal print head so as to cause a blackening in the first functional layer and to further cause at least some of the bacteriorhodopsin in the first functional layer to irreversibly change its color due to heat generated by said thermal print head.
A document comprising:
- a carrier layer,
- a first functional layer, the first functional layer being a thermosensitive layer such that printing of the document with a thermal print head causes a blackening in the first functional layer;
- and
- a second functional layer comprising bacteriorhodopsin as a color pigment such that heat generated by printing of the document with said thermal print head additionally causes at least some of the bacteriorhodopsin in the second functional layer to irreversibly change its color.
1 more element
A method for manufacturing a document, the method comprising:
- fixing a first and a second functional layer to a carrier layer, the first functional layer being a thermosensitive layer and the second functional layer comprising bacteriorhodopsin as a color pigment;
- and
- printing the document with a thermal print head so as to cause a blackening in the first functional layer and to further cause at least some of the bacteriorhodopsin in the second functional layer to irreversibly change its color due to heat generated by said thermal print head.
Dependencies are inferred from the claim text.