Temperature sensitive security document
First Claim
1. An improved security document, comprising:
- a substrate having top and bottom surfaces where at least said top surface is adapted to carry printed copy including indicia specific to said improved security document;
a colored background printed on at least a portion of said top surface of said substrate using a temperature sensitive ink, said colored background appearing a first distinct color every time said top surface is exposed to a temperature at and below a preselected temperature and appearing a second distinct color every time said top surface is exposed to a temperature above said preselected temperature, said colored background thereby being permanently reversible between said first distinct color and said second distinct color; and
copy printed over said colored background including indicia specific to said improved security document using a temperature insensitive ink of a third distinct color so as to always be visible whether said colored background appears said first distinct color or said second distinct color.
1 Assignment
0 Petitions
Accused Products
Abstract
To prevent unauthorized duplication of important security documents, an improvement in security or protected documents is disclosed. The security document includes a substrate having top and bottom surfaces where at least one of the surfaces is adapted to carry printed copy thereon. A colored background is printed on at least a portion of one of the surfaces, such as the surface which is adapted to carry printed copy, using a temperature sensitive ink. The security document also includes copy printed on at least a portion of the one of the surfaces adapted to carry printed copy thereon. With these features of construction, the security or protected document contemplates the copy being printed by utilizing a temperature insensitive ink.
87 Citations
19 Claims
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1. An improved security document, comprising:
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a substrate having top and bottom surfaces where at least said top surface is adapted to carry printed copy including indicia specific to said improved security document; a colored background printed on at least a portion of said top surface of said substrate using a temperature sensitive ink, said colored background appearing a first distinct color every time said top surface is exposed to a temperature at and below a preselected temperature and appearing a second distinct color every time said top surface is exposed to a temperature above said preselected temperature, said colored background thereby being permanently reversible between said first distinct color and said second distinct color; and copy printed over said colored background including indicia specific to said improved security document using a temperature insensitive ink of a third distinct color so as to always be visible whether said colored background appears said first distinct color or said second distinct color. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An improved security document, comprising:
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a substrate having top and bottom surfaces where at least said top surface is adapted to carry printed copy including indicia specific to said improved security document; a colored background printed on said top surface of said substrate using a temperature sensitive ink, said colored background appearing a first distinct color every time said top surface is exposed to a temperature at and below a preselected temperature and appearing a second distinct and contrasting color every time said top surface is exposed to a temperature above said preselected temperature such that said colored background is thereby permanently reversible between said first distinct color and said second distinct color, said colored background being printed on the entirety of said top surface with a portion using said temperature sensitive ink and the remainder using a temperature insensitive ink; and copy printed over said colored background including indicia specific to said improved security document using a temperature insensitive ink of a third distinct color so as to always be visible whether said colored background appears said first distinct color or said second distinct color; said preselected temperature being an ambient less than body temperature such that said second distinct color appear whenever said substrate is subjected to body temperature. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. An improved security document, comprising:
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a substrate having top and bottom surfaces where at least one of said surfaces is adapted to carry printed copy thereon; a colored background printed on at least a portion of one of said surfaces using a temperature sensitive ink, said temperature sensitive ink appearing a first distinct color every time it is exposed to a temperature at and below a preselected temperature and appearing a second distinct color every time it is exposed to a temperature above preselected temperature, said temperature sensitive ink thereby being permanently reversible between said first distinct color and said second distinct color; and copy printed on at least a portion of said one of said surfaces of said substrate using a temperature insensitive ink therefor. - View Dependent Claims (17, 18, 19)
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Specification