(19)

(11)

EP 0 032 949 A1

(12)

(43) Date of publication: 05.08.1981 Bulletin 1981/31 (21) Application number: 80901636.0 (22) Date of filing: 06.08.1980

(51) International Patent Classification (IPC):  C01B 23/ 00( . ) G21F 9/ 02( . ) G21F 9/ 00( . ) (86) International application number: PCT/US1980/000992 (87) International publication number: WO 1981/000413 (19.02.1981 Gazette 1981/05)

(84) Designated Contracting States: FR (30) Priority: 06.08.1979 US 19790063970 (71) Applicant: SCIENCE APPLICATIONS, INC. La Jolla, CA 92038 (US)	(72) Inventors: PENCE, Dallas T. San Diego, CA 92131 (US) CHOU, Chun-Chao San Diego, CA 92041 (US) (74) Representative: Fisher, Bernard, et al  B. FISHER & CO. 36 Sydenham Road Croydon Surrey CR0 2EF Croydon Surrey CR0 2EF (GB)