(19)

(11)

EP 1 644 664 A1

(12)

(43) Date of publication: 12.04.2006 Bulletin 2006/15 (21) Application number: 04742244.9 (22) Date of filing: 16.06.2004

(51) International Patent Classification (IPC):  F23K 3/16(1968.09) F23L 1/00(1968.09) F23G 7/10(1985.01) (86) International application number: PCT/FI2004/050094 (87) International publication number: WO 2004/111535 (23.12.2004 Gazette 2004/52)

(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 PL PT RO SE SI SK TR (30) Priority: 19.06.2003 FI 20035103 (71) Applicant: HT Lasertekniikka OY 15170 Lahti (FI)	(72) Inventor: HAKALA, Vesa FI-66400 Laihia (FI) (74) Representative: Helke, Kimmo Kalervo  Kespat Oy, P.O. Box 601 40101 Jyväskylä 40101 Jyväskylä (FI)