(19)

(11)

EP 2 513 374 A1

(12)

(43) Date of publication: 24.10.2012 Bulletin 2012/43 (21) Application number: 10837137.8 (22) Date of filing: 19.11.2010

(51) International Patent Classification (IPC):  E01B 19/00(2006.01) (86) International application number: PCT/IB2010/055290 (87) International publication number: WO 2011/073826 (23.06.2011 Gazette 2011/25)

(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 (30) Priority: 14.12.2009 US 286031 P (71) Applicant: Wilson Acoustics Limited Shatin, Hong Kong (CN)	(72) Inventor: HO, Wai, Lun Shatin, Hong Kong (CN) (74) Representative: Johansson, Lars E.  Hynell Patenttjänst AB P.O. Box 138 683 23 Hagfors 683 23 Hagfors (SE)