(19)

(11)

EP 0 767 897 A1

(12)

(43) Date of publication: 16.04.1997 Bulletin 1997/16 (21) Application number: 95923124.0 (22) Date of filing: 27.06.1995

(51) International Patent Classification (IPC):  G01F 23/ 00( . ) G01N 27/ 06( . ) G01F 23/ 24( . ) (86) International application number: PCT/AU1995/000377 (87) International publication number: WO 1996/000885 (11.01.1996 Gazette 1996/03)

(84) Designated Contracting States: ES IE (30) Priority: 29.06.1994 AU 1994PM06540 (71) Applicant: ALCOA OF AUSTRALIA LIMITED Melbourne, VIC 3000 (AU)	(72) Inventor: DOOLEY, Vince, Robert Booragoon, W.A. 6154 (AU) (74) Representative: Hammond, Andrew David  Albihn West AB, P.O. Box 142 401 22 Göteborg 401 22 Göteborg (SE)