(19)

(11)

EP 1 461 511 A1

(12)

(43) Date of publication: 29.09.2004 Bulletin 2004/40 (21) Application number: 02796159.8 (22) Date of filing: 17.12.2002

(51) International Patent Classification (IPC)7: E21C 37/14 (86) International application number: PCT/ZA2002/000212 (87) International publication number: WO 2003/056133 (10.07.2003 Gazette 2003/28)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SI SK TR Designated Extension States: AL LT LV MK RO (30) Priority: 03.01.2002 ZA 200105466 (71) Applicant: NXCO INTERNATIONAL LIMITED Nassau (BS)	(72) Inventor: VAN DYK, Andre Centurion,0002 Pretoria (ZA) (74) Representative: Solf, Alexander, Dr.  PatentanwälteDr. Solf & ZapfCandidplatz 15 81543 München 81543 München (DE)