(19)

(11)

EP 2 561 153 A2

(12)

(88) Date of publication A3: 23.02.2012 (43) Date of publication: 27.02.2013 Bulletin 2013/09 (21) Application number: 11772411.2 (22) Date of filing: 31.03.2011

(51) International Patent Classification (IPC):  E04B 1/24(2006.01) E04B 1/58(2006.01) (86) International application number: PCT/US2011/030780 (87) International publication number: WO 2011/133308 (27.10.2011 Gazette 2011/43)

(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: 19.04.2010 US 804602 (71) Applicant: Yang, Weihong Sunnyvale, CA 94087 (US)	(72) Inventor: Yang, Weihong Sunnyvale, CA 94087 (US) (74) Representative: Beattie, Alex Thomas Stewart  Forresters Skygarden Erika-Mann-Strasse 11 80636 München 80636 München (DE)