(19)

(11)

EP 0 758 495 A1

(12)

(43) Date of publication: 19.02.1997 Bulletin 1997/08 (21) Application number: 95921235.0 (22) Date of filing: 05.05.1995

(51) International Patent Classification (IPC):  G02B 5/ 18( . ) H01S 3/ 08( . ) G02B 27/ 00( . ) H01S 3/ 10( . ) (86) International application number: PCT/US1995/005788 (87) International publication number: WO 1995/031024 (16.11.1995 Gazette 1995/49)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 06.05.1994 US 19940239028 04.05.1995 US 19950433815 (60) Divisional application: 98200675.1 / 0852415 (71) Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA Minneapolis, Minnesota 55455 (US)	(72) Inventor: LEGER, James, R. Plymouth, MN 55455 (US) (74) Representative: Beresford, Keith Denis Lewis, et al  BERESFORD & Co. 2-5 Warwick Court High Holborn London WC1R 5DJ London WC1R 5DJ (GB)