(19)

(11)

EP 1 468 370 A1

(12)

(43) Date of publication: 20.10.2004 Bulletin 2004/43 (21) Application number: 02806217.2 (22) Date of filing: 20.12.2002

(51) International Patent Classification (IPC)7: G06F 15/16, G05D 3/00, G05D 5/00, G05D 9/00, G05D 17/00 (86) International application number: PCT/US2002/041343 (87) International publication number: WO 2003/058481 (17.07.2003 Gazette 2003/29)

(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: 26.12.2001 US 34811 (71) Applicant: ABB, Inc. Raleigh, NC 27606 (US)	(72) Inventors: HART, David G. Raleigh, NC 27606 (US) UY, David Raleigh, NC 27606 (US) LAPLACE, Carl J. Raleigh, NC 27615 (US) EGOLF, William M. Apex, NC 27502 (US) (74) Representative: Collins, John David  Marks & Clerk,57-60 Lincoln's Inn Fields London WC2A 3LS London WC2A 3LS (GB)