(19)

(11)

EP 0 136 306 A1

(12)

(43) Date of publication: 10.04.1985 Bulletin 1985/15 (21) Application number: 84900837.0 (22) Date of filing: 24.02.1984

(51) International Patent Classification (IPC):  G02B 6/ 02( . ) G02B 6/ 10( . ) C03C 13/ 04( . ) (86) International application number: PCT/AU1984/000024 (87) International publication number: WO 1984/003362 (30.08.1984 Gazette 1984/21)

(84) Designated Contracting States: DE FR GB (30) Priority: 25.02.1983 AU 19830008202 (71) Applicant: THE AUSTRALIAN NATIONAL UNIVERSITY Acton, Australian Capital Territory 2600 (AU)	(72) Inventors: SNYDER, Allan, Whitenack Braddon, ACT 2601 (AU) RÜHL, Frank, Friedrich Aranda, ACT 2614 (AU) PAYNE, David, Neil Bursledon, Hants (GB) (74) Representative: Day, Jeremy John, et al  REDDIE & GROSE 16 Theobalds Road London, WC1X 8PL London, WC1X 8PL (GB)