Improvement of the strength of paper sheets

(19)

(11)

EP 1 466 756 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	07.02.2007 Bulletin 2007/06

(43)	Date of publication A2:
	13.10.2004 Bulletin 2004/42

(21)	Application number: 04251941.3

(22)	Date of filing: 31.03.2004

(51)

International Patent Classification (IPC):

B31F 1/07^(2006.01)

B42D 15/00^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL LT LV MK

(30)

Priority:

03.04.2003 GB 0307755

(71)	Applicant: De La Rue International Limited
	Basingstoke, Hampshire RG22 4BS (GB)

(72)	Inventors:
	Howland, Paul Andover Hants, SP10 2QR (GB) Pearson, Nicholas George Kingsclere Hampshire RG20 5PJ (GB)

(74)	Representative: Bucks, Teresa Anne et al
	BOULT WADE TENNANT, Verulam Gardens 70 Gray's Inn Road London WC1X 8BT London WC1X 8BT (GB)

(54)	Improvement of the strength of paper sheets

(57) The invention relates to improvements in paper, and in particular to the use of watermarks and security elements for strengthening paper sheets and documents made therefrom. The invention therefore provides a sheet having at least four corners and at least four sides joined at said corners, wherein corner reinforcing watermarks are provided at each of said corners. An elongate security element is at least partially embedded within the sheet along and close to an edge of each of at least a pair of opposing sides.

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