(19)

(11)

EP 0 575 324 A1

(12)

(43) Date of publication: 29.12.1993 Bulletin 1993/52 (21) Application number: 91915541.0 (22) Date of filing: 26.07.1991

(51) International Patent Classification (IPC):  H01S 3/ 032( . ) H01S 3/ 104( . ) H01S 3/ 08( . ) (86) International application number: PCT/US1991/005313 (87) International publication number: WO 1992/002977 (20.02.1992 Gazette 1992/05)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 27.07.1990 US 19900558776 17.04.1991 US 19910686664 (71) Applicant: ION LASER TECHNOLOGY Salt Lake City, UT 84116 (US)	(72) Inventor: OSTLER, Kevin Salt Lake City, UT 84084 (US) (74) Representative: Johnstone, Helen Margaret  Urquhart-Dykes & Lord Tower House Merrion Way Leeds LS2 8PA Leeds LS2 8PA (GB)