(19)

(11)

EP 0 573 452 A1

(12)

(43) Date of publication: 15.12.1993 Bulletin 1993/50 (21) Application number: 92904104.0 (22) Date of filing: 10.02.1992

(51) International Patent Classification (IPC):  C25C 1/ 18( . ) H01M 10/ 54( . ) (86) International application number: PCT/EP1992/000306 (87) International publication number: WO 1992/014866 (03.09.1992 Gazette 1992/23)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI NL SE (30) Priority: 13.02.1991 GB 19910002994 (71) Applicant: SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V. NL-2596 HR Den Haag (NL)	(72) Inventors: SPIJKERMAN, Johannus, Bernardus, Jozef NL-6827 AT Arnhem (NL) GROENEN, Rudolf, Johannes, Mathilda NL-6827 AT Arnhem (NL) (74) Representative: Meddle, Alan Leonard, et al  FORRESTER & BOEHMERT Franz-Joseph-Strasse 38 80801 München 80801 München (DE)