(19)

(11)

EP 0 243 374 A1

(12)

(43) Date of publication: 04.11.1987 Bulletin 1987/45 (21) Application number: 86902263.0 (22) Date of filing: 18.10.1985

(51) International Patent Classification (IPC):  H01S 3/ 097( . ) H03K 3/ 55( . ) (86) International application number: PCT/US1985/002019 (87) International publication number: WO 1987/002517 (23.04.1987 Gazette 1987/09)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (71) Applicant: AMOCO CORPORATION Chicago, IL 60680 (US)	(72) Inventors: FAHLEN, Theodore, S. San Jose, CA 95120 (US) MASS, Barton San Jose, CA 95132 (US) (74) Representative: Laredo, Jack Joseph, et al  Elkington and Fife Prospect House 8 Pembroke Road Sevenoaks, Kent TN13 1XR Sevenoaks, Kent TN13 1XR (GB)