Patent Document ID: 4234214
Application ID: 05934061

Base Claim:
1. A set of banknotes, wherein each banknote carries at a first position a legible code, unique to that banknote, consisting of an arrangement of alphanumeric characters in a negative reverse form within a multi-color background which immediately surrounds said characters and which is printed upon the banknote using printing media of a plurality of different colors, and also carries at a second position a further legible code consisting of said named arrangement of alphanumeric characters in a positive form, and wherein said codes comprise serial numbers by which the banknotes are sequentially numbered.

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Claim 2:
2. A set according to claim 1 wherein, in respect of each banknote, the positive characters of said further code, and the background to said first-mentioned code comprise complementary patterns of the same colors.