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 3:
3. A set according to claim 1 wherein each banknote carries an additional legible code including, in reverse negative form, the same arrangement of alphanumeric characters as is included in the first-mentioned code upon a multi-color background different to that of said first-mentioned code.