(19)

(11)

EP 2 655 247 A1

(12)

(43) Date of publication: 30.10.2013 Bulletin 2013/44 (21) Application number: 11806053.2 (22) Date of filing: 13.12.2011

(51) International Patent Classification (IPC):  C01B 6/04(2006.01) C01B 33/107(2006.01) C25B 1/18(2006.01) C01B 33/04(2006.01) C25B 1/14(2006.01) (86) International application number: PCT/US2011/064545 (87) International publication number: WO 2012/087653 (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: 23.12.2010 US 978189 23.12.2010 US 978209 (71) Applicant: MEMC Electronic Materials, Inc. St. Peters, MO 63376 (US)	(72) Inventors: GUPTA, Puneet St. Peters, Missouri 63376 (US) ERK, Henry Frank St. Peters, Missouri 63376 (US) GRABBE, Alexis St. Peters, Missouri 63376 (US) (74) Representative: Maiwald Patentanwalts GmbH  Elisenhof Elisenstrasse 3 80335 München 80335 München (DE)