(19)

(11)

EP 0 267 948 A1

(12)

(43) Date of publication: 25.05.1988 Bulletin 1988/21 (21) Application number: 87903672.0 (22) Date of filing: 25.05.1987

(51) International Patent Classification (IPC):  B07B 13/ 00( . ) B07B 13/ 10( . ) (86) International application number: PCT/AU1987/000155 (87) International publication number: WO 1987/007187 (03.12.1987 Gazette 1987/27)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 26.05.1986 AU 19860006091 (71) Applicant: COMALCO ALUMINIUM LIMITED Brisbane, QLD 4000 (AU)	(72) Inventor: DONECKER, Peter Bellbowrie, QLD 4070 (AU)