(19)

(11)

EP 0 302 903 A1

(12)

(43) Date of publication: 15.02.1989 Bulletin 1989/07 (21) Application number: 88900738.0 (22) Date of filing: 14.12.1987

(51) International Patent Classification (IPC):  H01S 3/ 038( . ) H01S 3/ 03( . ) (86) International application number: PCT/US1987/003296 (87) International publication number: WO 1988/006357 (25.08.1988 Gazette 1988/19)

(84) Designated Contracting States: CH DE FR GB IT LI NL SE (30) Priority: 20.02.1987 US 19870017113 (71) Applicant: Hughes Aircraft Company Los Angeles California 90045-0066 (US)	(72) Inventors: KUEI-RU, Chien Cerritos, CA 90701 (US) PARAZZOLI, Claudio Pacific Palisades, CA 90272 (US) (74) Representative: Colgan, Stephen James, et al  CARPMAELS & RANSFORD 43 Bloomsbury Square London WC1A 2RA London WC1A 2RA (GB)