(19)

(11)

EP 1 704 296 A1

(12)

(43) Date of publication: 27.09.2006 Bulletin 2006/39 (21) Application number: 04799271.4 (22) Date of filing: 29.11.2004

(51) International Patent Classification (IPC):  E21B 19/00(2006.01) E04H 17/26(2006.01) E21B 19/07(2006.01) (86) International application number: PCT/IB2004/052588 (87) International publication number: WO 2005/056974 (23.06.2005 Gazette 2005/25)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LU MC NL PL PT RO SE SI SK TR (30) Priority: 10.12.2003 IT RM20030567 (71) Applicant: Laportella, Pier Giorgio 00167 Roma (IT)	(72) Inventor: Laportella, Pier Giorgio 00167 Roma (IT) (74) Representative: Papa, Elisabetta et al Società Italiana Brevetti S.p.A Piazza di Pietra, 39 00186 Roma 00186 Roma (IT)