(19)

(11)

EP 2 697 423 A1

(12)

(43) Date of publication: 19.02.2014 Bulletin 2014/08 (21) Application number: 12719792.9 (22) Date of filing: 16.04.2012

(51) International Patent Classification (IPC):  D21F 1/44(2006.01) (86) International application number: PCT/GB2012/050833 (87) International publication number: WO 2012/140448 (18.10.2012 Gazette 2012/42)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME (30) Priority: 14.04.2011 GB 201106347 (71) Applicant: Woollard And Henry Ltd. Aberdeenshire AB217DZ (GB)	(72) Inventor: BOWDEN, Frederick James Aberdeen AB15 8BW (GB) (74) Representative: Crosby, Wendy Agnes  Murgitroyd & Company Scotland House 165-169 Scotland Street Glasgow G5 8PL Glasgow G5 8PL (GB)