(19)

(11)

EP 0 160 685 A1

(12)

(43) Date of publication: 13.11.1985 Bulletin 1985/46 (21) Application number: 84904066.0 (22) Date of filing: 06.11.1984

(51) International Patent Classification (IPC):  G02B 6/ 26( . ) G02B 6/ 36( . ) (86) International application number: PCT/AU1984/000225 (87) International publication number: WO 1985/002270 (23.05.1985 Gazette 1985/12)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 08.11.1983 AU 19830002309 (71) Applicant: THE COMMONWEALTH OF AUSTRALIA Canberra, Australian Capital Territory 2600 (AU)	(72) Inventor: MATTHEWS, Herbert, George Salisbury, S.A. 5108 (AU) (74) Representative: Opperman, Stuart Richard, et al  Haseltine Lake & Co. Hazlitt House 28 Southampton Buildings Chancery Lane London WC2A 1AT London WC2A 1AT (GB)