(19)

(11)

EP 2 297 403 A1

(12)

(43) Date of publication: 23.03.2011 Bulletin 2011/12 (21) Application number: 09735406.2 (22) Date of filing: 22.04.2009

(51) International Patent Classification (IPC):  E01C 13/02(2006.01) E01C 13/08(2006.01) (86) International application number: PCT/IB2009/051651 (87) International publication number: WO 2009/130672 (29.10.2009 Gazette 2009/44)

(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 MK MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA RS (30) Priority: 24.04.2008 IT RM20080223 (71) Applicants: Poduti, Renzo 00123 Roma RM (IT) Principi, Adalberto 20100 Milano MI (IT)	(72) Inventor: The designation of the inventor has not yet been filed  () (74) Representative: Romano, Giuseppe et al Società Italiana Brevetti Piazza di Pietra 38-39 00186 Roma 00186 Roma (IT)