(19)

(11)

EP 1 311 149 A2

(12)

(88) Date of publication A3: 10.05.2002 (43) Date of publication: 21.05.2003 Bulletin 2003/21 (21) Application number: 01966080.2 (22) Date of filing: 21.08.2001

(51) International Patent Classification (IPC)7: A01C 1/00 (86) International application number: PCT/US0126/221 (87) International publication number: WO 0201/5667 (28.02.2002 Gazette 2002/09)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 21.08.2000 US 642876 (71) Applicants: Zelinski, William J. Plover, WI 54437 (US) Tallackson, Thomas K. St. Paul, MN 55106 (US)	(72) Inventors: Zelinski, William J. Plover, WI 54437 (US) Tallackson, Thomas K. St. Paul, MN 55106 (US) (74) Representative: Powell, Stephen David et al Williams Powell,Morley House,26-30 Holborn Viaduct London EC1A 2BP London EC1A 2BP (GB)