(19)
(11) EP 0 234 885 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.02.1988 Bulletin 1988/06

(43) Date of publication A2:
02.09.1987 Bulletin 1987/36

(21) Application number: 87301485

(22) Date of filing: 20.02.1987
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 24.02.1986 US 832225

(71) Applicant: MOORE BUSINESS FORMS, INC.
 ()

(72) Inventor:
  • Van Malderghem, Edmund G.
     ()

   


(54) Document bearing characteristic ink-printed indicia juxtaposed with corresponding characteristic synthetic watermark and method for producing same


(57) A document security system is provided by providing each document with a synthetic watermark, for instance using the process, compositions and apparatus disclosed in the aforementioned U.S. patent of Norris, et al and, within the perimeter of at least one of the symbols which is provided by the synthetic watermark, an identical complementary or otherwise corresponding symbol is printed using ink, paint, dye, stain or similarly contrastingly pigmented substance so as to create, in combination with the synthetic watermark a juxtaposition that can be looked-for as evidence that the document is genuine and its serial number unaltered.






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