(19)

(11)

EP 0 248 797 A1

(12)

(43) Date of publication: 16.12.1987 Bulletin 1987/51 (21) Application number: 86901020.0 (22) Date of filing: 04.02.1986

(51) International Patent Classification (IPC):  H01S 3/ 137( . ) G01M 3/ 38( . ) H01S 3/ 1055( . ) G01M 3/ 24( . ) H01S 3/ 00( . ) H01S 3/ 139( . ) (86) International application number: PCT/AU1986/000026 (87) International publication number: WO 1986/004746 (14.08.1986 Gazette 1986/18)

(84) Designated Contracting States: AT BE CH DE FR IT LI NL SE (30) Priority: 08.02.1985 AU 19850009204 (71) Applicants: UNIVERSITY OF QUEENSLAND St Lucia, Queensland 4067 (AU) COMMONWEALTH OF AUSTRALIA DEPARTMENT OF INDUSTRY TECHNOLOGY AND COMMERCE Belconnen Town Centre, ACT 2616 (AU)	(72) Inventor: JAMES, David, William Kenmore, QLD 4069 (AU) (74) Representative: Hands, Horace Geoffrey  GEORGE FUERY & CO Whitehall Chambers 23 Colmore Row Birmingham B3 2BL Birmingham B3 2BL (GB)