(19)

(11)

EP 0 518 974 A1

(12)

(43) Date of publication: 23.12.1992 Bulletin 1992/52 (21) Application number: 91906017.0 (22) Date of filing: 07.03.1991

(51) International Patent Classification (IPC):  C11D 17/ 04( . ) (86) International application number: PCT/AU1991/000079 (87) International publication number: WO 1991/013970 (19.09.1991 Gazette 1991/22)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 07.03.1990 AU 19900008973 (71) Applicant: O'ROURKE, Peter William Kingswood, S.A. 5062 (AU)	(72) Inventor: O'ROURKE, Peter William Kingswood, S.A. 5062 (AU) (74) Representative: Denmark, James  Bailey, Walsh & Co. 5 York Place Leeds LS1 2SD Yorkshire Leeds LS1 2SD Yorkshire (GB)