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(11)

EP 2 438 030 A1

(12)

(43) Date of publication: 11.04.2012 Bulletin 2012/15 (21) Application number: 10723796.8 (22) Date of filing: 31.05.2010

(51) International Patent Classification (IPC):  C04B 35/52(2006.01) C04B 35/628(2006.01) E21B 10/00(2006.01) C04B 35/645(2006.01) C03B 29/04(2006.01) (86) International application number: PCT/IB2010/052418 (87) International publication number: WO 2010/140108 (09.12.2010 Gazette 2010/49)

(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 SE SI SK SM TR (30) Priority: 01.06.2009 GB 0909350 02.06.2009 US 183208 P (71) Applicant: Element Six (Production) (Pty) Ltd. 1559 Springs (ZA)	(72) Inventors: NAIDOO, Kaveshini 1559 Springs (ZA) SHABALALA, Thembinkosi 1559 Springs (ZA) (74) Representative: Reeve, Anna Elizabeth  Element Six Limited 3rd Floor, Building 4, Chiswick Park 566 Chiswick High Road GB-London W4 5YE GB-London W4 5YE (GB)