(19)

(11)

EP 0 956 448 A1

(12)

(43) Date of publication: 17.11.1999 Bulletin 1999/46 (21) Application number: 98901363.0 (22) Date of filing: 26.01.1998

(51) International Patent Classification (IPC):  F04B 39/ 16( . ) (86) International application number: PCT/FI1998/000067 (87) International publication number: WO 1998/032970 (30.07.1998 Gazette 1998/30)

(84) Designated Contracting States: AT BE CH 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: 27.01.1997 FI 19970000329 (71) Applicant: KEMIRA AGRO OY 00180 Helsinki (FI)	(72) Inventor: LEHTINEN, Aaro FIN-71800 Siilinjärvi (FI) (74) Representative: Svensson, Johan Henrik  Berggren Oy Ab, P.O. Box 16 00101 Helsinki 00101 Helsinki (FI)