(19)

(11)

EP 1 466 023 A1

(12)

(43) Date of publication: 13.10.2004 Bulletin 2004/42 (21) Application number: 02805163.9 (22) Date of filing: 16.12.2002

(51) International Patent Classification (IPC)7: C21D 1/58 (86) International application number: PCT/US2002/040160 (87) International publication number: WO 2003/052145 (26.06.2003 Gazette 2003/26)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SI SK TR Designated Extension States: AL LT LV MK RO (30) Priority: 18.12.2001 US 341612 P (71) Applicant: THE LUBRIZOL CORPORATION Wickliffe,Ohio 44092-2298 (US)	(72) Inventors: SWEET, William, R. Richmond Hts., OH 44143 (US) SIVIK, Matthew, R. Broadview Hts., OH 44147 (US) (74) Representative: Mallalieu, Catherine Louise et al D. Young & Co.,21 New Fetter Lane London EC4A 1DA London EC4A 1DA (GB)