(19)

(11)

EP 2 756 253 A1

(12)

(43) Date of publication: 23.07.2014 Bulletin 2014/30 (21) Application number: 12832639.4 (22) Date of filing: 11.09.2012

(51) International Patent Classification (IPC):  F28D 20/02(2006.01) (86) International application number: PCT/US2012/054688 (87) International publication number: WO 2013/039926 (21.03.2013 Gazette 2013/12)

(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: 12.09.2011 US 201161533551 P (71) Applicant: Tahoe Technologies, Ltd. Grand Cayman KY1-1111 (KY)	(72) Inventors: XIANG, Xiaodong Danville, California 94526 (US) ZHANG, Rong Cupertino, California 95014 (US) (74) Representative: Perkins, Janet Frances  J A Kemp 14 South Square Gray's Inn London WC1R 5JJ London WC1R 5JJ (GB)