(19)

(11)

EP 0 236 447 A1

(12)

(43) Date of publication: 16.09.1987 Bulletin 1987/38 (21) Application number: 86905633.0 (22) Date of filing: 08.09.1986

(51) International Patent Classification (IPC):  H01L 31/ 05( . ) H01L 31/ 068( . ) (86) International application number: PCT/US1986/001845 (87) International publication number: WO 1987/001513 (12.03.1987 Gazette 1987/06)

(84) Designated Contracting States: DE FR GB IT SE (30) Priority: 09.09.1985 US 19850773696 (71) Applicant: Hughes Aircraft Company Los Angeles California 90045-0066 (US)	(72) Inventors: ELLION, M., Edmund Arcadia, CA 91006 (US) WOLFF, George Huntington Beach, CA 92648 (US)