(19)

(11)

EP 0 160 024 A1

(12)

(43) Date of publication: 06.11.1985 Bulletin 1985/45 (21) Application number: 84903796.0 (22) Date of filing: 12.10.1984

(51) International Patent Classification (IPC):  C04B 37/ 02( . ) H01J 9/ 24( . ) H01J 1/ 88( . ) (86) International application number: PCT/AU1984/000201 (87) International publication number: WO 1985/001831 (25.04.1985 Gazette 1985/10)

(84) Designated Contracting States: DE FR GB NL (30) Priority: 14.10.1983 AU 19830001851 (71) Applicant: SPALDING, David Ian Castle Hill, N.S.W. 2154 (AU)	(72) Inventor: SPALDING, David Ian Castle Hill, N.S.W. 2154 (AU) (74) Representative: Rooney, Paul Blaise  D.Young & Co. 10 Staple Inn London WC1V 7RD London WC1V 7RD (GB)