Printed matter – Having revealable concealed information – fraud preventer or... – Utilizing electromagnetic radiation
Patent
1990-12-26
1992-07-07
Bell, Paul A.
Printed matter
Having revealable concealed information, fraud preventer or...
Utilizing electromagnetic radiation
281 151, 281 38, 283 36, 283 37, 283 38, 283 40, 283 39, B42D 1500
Patent
active
051276771
ABSTRACT:
The invention relates to security means for securing the sequential order of the pages of a book such as a passport, or other such security document, by enabling the convenient detection of any removed pages through a visual inspection of the book. Specifically, the invention provides a means of marking the unbound edges of the pages of a book whereby any subsequently missing page(s) may be detected upon a visual review of the unbound side of the book. The tamper-proof comprises a plurality of pages, a spine at a first side of the pages and a visually detectable marking on each one of successive ones of the pages at the outer edge of the side which is opposite the first side. The markings collectively depict a visual image across the outer edges of the opposite sides of the pages such that the absence of any one of the successive pages is identifiable upon viewing the image. Preferably, the markings are printed by means of invisible fluorescent ink.
REFERENCES:
patent: 4300791 (1981-11-01), Bohrer et al.
patent: 4355824 (1982-10-01), Weber et al.
patent: 4427290 (1984-01-01), Kaye et al.
Bell Paul A.
Canadian Bank Note Company, Limited
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