(19)

(11)

EP 2 288 753 A1

(12)

(43) Date of publication: 02.03.2011 Bulletin 2011/09 (21) Application number: 08749531.3 (22) Date of filing: 09.04.2008

(51) International Patent Classification (IPC):  E01D 19/04(2006.01) (86) International application number: PCT/EP2008/054301 (87) International publication number: WO 2009/124589 (15.10.2009 Gazette 2009/42)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA MK RS (71) Applicant: Alga S.P.A. 20142 Milano (IT)	(72) Inventor: MARIONI, Agostino I-20142 Milano (IT) (74) Representative: Cabinet Plasseraud  52, rue de la Victoire 75440 Paris Cedex 09 75440 Paris Cedex 09 (FR)