(19)

(11)

EP 0 023 223 A1

(12)

(43) Date of publication: 04.02.1981 Bulletin 1981/05 (21) Application number: 80900372.0 (22) Date of filing: 23.01.1980

(51) International Patent Classification (IPC):  H04B 1/ 68( . ) H04J 1/ 08( . ) H04B 3/ 38( . ) (86) International application number: PCT/US1980/000067 (87) International publication number: WO 1980/001633 (07.08.1980 Gazette 1980/18)

(84) Designated Contracting States: AT CH DE FR GB LU NL SE (30) Priority: 29.01.1979 US 19790007666 (71) Applicant: THE ANACONDA COMPANY Denver, CO 80217 (US)	(72) Inventors: BENCH, Stephen M. Huntington Beach, CA 92646 (US) THIBODEAU, Paul H. Stanton, CA 90680 (US) CAMPBELL, Guy M. Corona, CA 91720 (US) STUMP, Theodore M. Costa Mesa, CA 92626 (US) (74) Representative: Huntingford, David Ian, et al  W.P. THOMPSON & CO. Coopers Building Church Street Liverpool L1 3AB Liverpool L1 3AB (GB)