(19)

(11)

EP 1 412 590 A1

(12)

(43) Date of publication: 28.04.2004 Bulletin 2004/18 (21) Application number: 02745449.5 (22) Date of filing: 02.07.2002

(51) International Patent Classification (IPC)7: E04B 5/29, E04C 3/293 (86) International application number: PCT/FI2002/000596 (87) International publication number: WO 2003/004791 (16.01.2003 Gazette 2003/03)

(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 SK TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 02.07.2001 FI 20011440 (71) Applicant: Ekobalk Oy 33820 Tampere (FI)	(72) Inventor: VAINIONPÄÄ, Pentti FIN-40957 Muurame (FI) (74) Representative: Helke, Kimmo Kalervo  Kespat Oy,P.O. Box 601 40101 Jyväskylä 40101 Jyväskylä (FI)