(19)

(11)

EP 1 351 881 A1

(12)

(43) Date of publication: 15.10.2003 Bulletin 2003/42 (21) Application number: 01964498.8 (22) Date of filing: 30.08.2001

(51) International Patent Classification (IPC)7: C01B 31/34 (86) International application number: PCT/US0126/875 (87) International publication number: WO 0202/8773 (11.04.2002 Gazette 2002/15)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 29.09.2000 US 675510 (71) Applicant: OSRAM SYLVANIA INC. Danvers, MA 01923 (US)	(72) Inventor: CHRISTIAN, Joel, B. Towanda, PA 18848 (US) (74) Representative: Lejet, Christian  Cabinet C. Lejet,69, rue Victor Hugo 92400 Courbevoie 92400 Courbevoie (FR)