(19)

(11)

EP 2 655 252 A1

(12)

(43) Date of publication: 30.10.2013 Bulletin 2013/44 (21) Application number: 11850059.4 (22) Date of filing: 20.12.2011

(51) International Patent Classification (IPC):  C01B 33/023(2006.01) C25B 1/00(2006.01) (86) International application number: PCT/CN2011/002138 (87) International publication number: WO 2012/083588 (28.06.2012 Gazette 2012/26)

(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: 20.12.2010 WO PCT/CN2010/002087 (71) Applicant: Epro Development Limited Hongkong (CN)	(72) Inventors: LAU, Albert Pui Sang Hongkong (CN) LAU, Lee Cheung Hongkong (CN) (74) Representative: UEXKÜLL & STOLBERG  Patentanwälte Beselerstrasse 4 22607 Hamburg 22607 Hamburg (DE)