(19)

(11)

EP 0 629 177 A1

(12)

(43) Date of publication: 21.12.1994 Bulletin 1994/51 (21) Application number: 93907256.0 (22) Date of filing: 04.03.1993

(51) International Patent Classification (IPC):  C01B 11/ 02( . ) (86) International application number: PCT/US1993/002015 (87) International publication number: WO 1993/017960 (16.09.1993 Gazette 1993/22)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 04.03.1992 US 19920846468 23.11.1992 US 19920980262 (71) Applicant: ARCO RESEARCH, INC. Melville, NY 11747 (US)	(72) Inventor: ROOZDAR, Habib Nesconset, NY 11767 (US) (74) Representative: Forattini, Amelia  c/o Internazionale Brevetti Ingg. ZINI, MARANESI & C. S.r.l. Piazza Castello 1 I-20121 Milano I-20121 Milano (IT)