(19)

(11)

EP 1 159 581 A1

(12)

(43) Date of publication: 05.12.2001 Bulletin 2001/49 (21) Application number: 00914327.2 (22) Date of filing: 24.02.2000

(51) International Patent Classification (IPC)7: F42D 1/18, F42D 3/04, F42D 5/045, F42D 5/05, F42D 5/055, E21C 37/14 (86) International application number: PCT/IB0000/446 (87) International publication number: WO 0054/002 (14.09.2000 Gazette 2000/37)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 11.03.1999 US 124275 P 09.04.1999 US 289527 09.04.1999 US 288735 (71) Applicant: RockTek Limited Pinjarra, W.A. 6208 (AU)	(72) Inventors: TOTA, Edward, W. Mandurah, W.A. 6210 (AU) GAVRILOVIC, Mihailo Denver, CO 80222 (US) WATSON, John, D. Evergreen, CO 80439 (US) GEORGIOU, Peter, N. St. Ives, NSW 2075 (AU) BRANSON, Jeffrey, W. Mandurah, W.A. 6210 (AU) (74) Representative: Evens, Paul Jonathan  Maguire Boss,5 Crown Street St. Ives,Cambridge PE27 5EB St. Ives,Cambridge PE27 5EB (GB)