(19)

(11)

EP 1 157 167 A1

(12)

(43) Date of publication: 28.11.2001 Bulletin 2001/48 (21) Application number: 99971880.2 (22) Date of filing: 14.10.1999

(51) International Patent Classification (IPC)7: E01F 15/10, E01F 13/02 (86) International application number: PCT/AU9900/881 (87) International publication number: WO 0028/148 (18.05.2000 Gazette 2000/20)

(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: 11.11.1998 AU PP707498 23.02.1999 AU PP883499 (71) Applicant: Barron & Rawson PTY Limited Revesby, NSW 2212 (AU)	(72) Inventor: DALRYMPLE, Geoffrey Winston Hills, NSW 2153 (AU) (74) Representative: Tillbrook, Christopher John et al Tillbrook & Co.,1 Mill Street Warwick,Warwickshire CV34 4HB Warwick,Warwickshire CV34 4HB (GB)