Security document with ultraviolet authentication security feature
First Claim
1. A security document having a security feature and a first side and a second side, wherein said security feature comprises:
- (a) a transparent window extending through said security document from said first side to said second side;
(b) a transparent ultraviolet light blocking layer within the area defined by said transparent window; and
,(c) a printed first ultraviolet fluorescent ink pattern between said transparent ultraviolet light blocking layer and said first side, and within said transparent window, said first ultraviolet fluorescent ink pattern normally being invisible but becoming visible when illuminated with ultraviolet light;
wherein when illuminated with ultraviolet light from said first side, said first ultraviolet fluorescent ink pattern becomes visible in said transparent window when viewed from said first side but is not visible in said transparent window when viewed from said second side.
1 Assignment
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Accused Products
Abstract
The invention relates to the field of printed security documents and, more particularly, to security documents and methods of making security documents bearing enhanced security features. The security documents may include identification documents or any other known documents of value. The security document includes a transparent window area with an ultraviolet blocking agent incorporated therein. Invisible ultraviolet fluorescent ink patterns are printed on respective opposite sides of the ultraviolet blocking agent within the region of the transparent window area. When either the face side or back side of the security document is illuminated with ultraviolet light, only the pattern printed proximate that side within the area of the transparent window becomes visible. When both face and back sides are simultaneously illuminated with ultraviolet light, the patterns printed on both sides of the ultraviolet blocking agent within the area of the transparent window become visible at the same time.
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Citations
54 Claims
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1. A security document having a security feature and a first side and a second side, wherein said security feature comprises:
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(a) a transparent window extending through said security document from said first side to said second side; (b) a transparent ultraviolet light blocking layer within the area defined by said transparent window; and
,(c) a printed first ultraviolet fluorescent ink pattern between said transparent ultraviolet light blocking layer and said first side, and within said transparent window, said first ultraviolet fluorescent ink pattern normally being invisible but becoming visible when illuminated with ultraviolet light; wherein when illuminated with ultraviolet light from said first side, said first ultraviolet fluorescent ink pattern becomes visible in said transparent window when viewed from said first side but is not visible in said transparent window when viewed from said second side. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method of applying a security feature to a security document having a first side and a second side, said method comprising:
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(a) forming a transparent window within said security document whereby said transparent window extends through said security document from said first side to said second side; (b) incorporating a transparent ultraviolet light blocking layer within the area defined by said transparent window; and
,(c) incorporating a printed first ultraviolet fluorescent ink pattern between said transparent ultraviolet blocking layer and said first side, within said transparent window, whereby said first ultraviolet fluorescent ink pattern is normally invisible but becomes visible when illuminated with ultraviolet light; whereby said first ultraviolet fluorescent ink pattern becomes visible in said transparent window when illuminated with ultraviolet light from said first side and viewed from said first side but is not visible when viewed from said second side. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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Specification