(19)

(11)

EP 0 105 328 A1

(12)

(43) Date of publication: 18.04.1984 Bulletin 1984/16 (21) Application number: 83901472.0 (22) Date of filing: 17.03.1983

(51) International Patent Classification (IPC):  C01B 33/ 107( . ) (86) International application number: PCT/US1983/000372 (87) International publication number: WO 1983/003244 (29.09.1983 Gazette 1983/23)

(84) Designated Contracting States: DE (30) Priority: 18.03.1982 US 19820359437 (71) Applicant: GENERAL ELECTRIC COMPANY Schenectady New York 12305 (US)	(72) Inventors: KRAY, William David Burnt Hills, NY 12027 (US) RAZZANO, John Simon Cohoes, NY 12047 (US) (74) Representative: Catherine, Alain  General Electric France Service de Propriété Industrielle 18 Rue Horace Vernet F-92136 Issy-Les-Moulineaux Cedex F-92136 Issy-Les-Moulineaux Cedex (FR)