(19)

(11)

EP 1 163 481 A2

(12)

(88) Date of publication A3: 28.12.2000 (43) Date of publication: 19.12.2001 Bulletin 2001/51 (21) Application number: 00906391.8 (22) Date of filing: 21.02.2000

(51) International Patent Classification (IPC)7: F26B 3/34, F26B 5/04, F26B 7/00, F26B 23/08 (86) International application number: PCT/FI0000/132 (87) International publication number: WO 0050/207 (31.08.2000 Gazette 2000/35)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 22.02.1999 FI 990376 24.06.1999 FI 991443 (71) Applicant: Lahden Ammattikorkeakoulu 15150 Lahti (FI)	(72) Inventor: ILMAVIRTA, Arvo FIN-15160 Lahti (FI) (74) Representative: Valkeiskangas, Tapio Lassi Paavali et al Oy Kolster Ab, Iso Roobertinkatu 23, P.O. Box 148 00121 Helsinki 00121 Helsinki (FI)