(19)

(11)

EP 1 606 216 A2

(12)

(43) Date of publication: 21.12.2005 Bulletin 2005/51 (21) Application number: 04709041.0 (22) Date of filing: 06.02.2004

(51) International Patent Classification (IPC)7: C01B 3/00 (86) International application number: PCT/US2004/003439 (87) International publication number: WO 2004/071947 (26.08.2004 Gazette 2004/35)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR Designated Extension States: AL LT LV MK (30) Priority: 06.02.2003 US 445485 P 21.02.2003 US 449131 P (71) Applicant: ZTEK CORPORATION Woburn, MA 01801 (US)	(72) Inventor: HSU, Michael, S. Lincoln, MA 01773 (US) (74) Representative: Lock, Graham James et al Fry Heath Spence The Gables Massetts Road Horley, Surrey RH6 7DQ Horley, Surrey RH6 7DQ (GB)