(19)

(11)

EP 0 514 409 A1

(12)

(43) Date of publication: 25.11.1992 Bulletin 1992/48 (21) Application number: 91903225.0 (22) Date of filing: 04.02.1991

(51) International Patent Classification (IPC):  G01C 19/ 72( . ) G02B 6/ 00( . ) H01S 3/ 06( . ) H01S 3/ 07( . ) H01S 3/ 063( . ) C09K 11/ 77( . ) G02F 1/ 35( . ) H01S 3/ 067( . ) H01S 3/ 17( . ) (86) International application number: PCT/GB1991/000161 (87) International publication number: WO 1991/012544 (22.08.1991 Gazette 1991/19)

(84) Designated Contracting States: DE FR GB (30) Priority: 06.02.1990 GB 19900002580 16.03.1990 GB 19900005917 (71) Applicant: THE UNIVERSITY OF SOUTHAMPTON Southampton, Hampshire SO9 5NH (GB)	(72) Inventors: MORKEL, Paul Roos Bassett, Southhampton, Hampshire SO2 3PH (GB) TAYLOR, Elizabeth Regala Woolston, Southampton, Hampshire SO2 9EY (GB) PAYNE, David Neil Southampton, Hampshire SO3 5QG (GB) (74) Representative: Harland, Linda Jane, et al  c/o Reddie & Grose 16 Theobalds Road London WC1X 8PL London WC1X 8PL (GB)