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US 4,290,630 AGranted
Security devices
AssigneeThe Governor and Company of the Bank of England
InventorPeter D. Lee
Life of this patent
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AssigneeThe Governor and Company of the Bank of England
InventorPeter D. Lee
Estimating the term…
A sheet element, such as a banknote, having an authenticating device in the form of a strip extending across the sheet and having at least one edge provided with a non-rectilinear portion or portions providing difficulty in copying for the forger and preferably shaped to provide coded information relating to the sheet element. In the case of a banknote, one or both edges of the strip may have wavy-shaped portion or portions, of which characteristics such as amplitude and periodicity can be employed to encode such information as the issuing authority, currency, denomination and serial number. Other aspects of the invention concern a method of verification comprising providing a sheet element as above and sensing the non-rectilinear edge or edges to derive the coded information, and a method of slitting a sheet comprising operating a slitting assembly to slit the sheet along a number of slitting lines into a plurality of strips as aforesaid.
A currency document comprising a sheet element bearing thereon legible information and incorporating authenticating means in the form of a visible thin strip, said strip having along at least a portion of one edge of a width dimension of said strip a wave-form variation, said variation defining coded information relating to the document.
Dependencies are inferred from the claim text.