(19)

(11)

EP 2 438 270 A2

(12)

(88) Date of publication A3: 12.05.2011 (43) Date of publication: 11.04.2012 Bulletin 2012/15 (21) Application number: 10731783.6 (22) Date of filing: 04.06.2010

(51) International Patent Classification (IPC):  E21D 20/02(2006.01) E21D 21/00(2006.01) (86) International application number: PCT/GB2010/050945 (87) International publication number: WO 2010/140006 (09.12.2010 Gazette 2010/49)

(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 SE SI SK SM TR (30) Priority: 04.06.2009 DE 102009023886 24.02.2010 DE 102010009106 (71) Applicant: Minova International Limited Park Road, Holmewood Industrial Estate Chesterfield Derbyshire S42 5UY (GB)	(72) Inventors: SWOBODA, Markus 45657 Recklinghausen (DE) BEYER, Hans-Georg 44789 Bochum (DE) RICHTER, Archibald 45131 Essen (DE) PETZOLD, Jan 51503 Rösrath (DE) (74) Representative: Peel, James Peter  Barker Brettell LLP 100 Hagley Road Edgbaston Birmingham B16 8QQ Edgbaston Birmingham B16 8QQ (GB)