(19)

(11)

EP 2 052 221 A1

(12)

(43) Date of publication: 29.04.2009 Bulletin 2009/18 (21) Application number: 07768905.7 (22) Date of filing: 10.07.2007

(51) International Patent Classification (IPC):  G01F 15/18(2006.01) (86) International application number: PCT/NL2007/000176 (87) International publication number: WO 2008/016293 (07.02.2008 Gazette 2008/06)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK RS (30) Priority: 29.07.2006 NL 1032254 (71) Applicant: Groenveld, Johannes Cornelis 1742 NX Schagen (NL)	(72) Inventor: Groenveld, Johannes Cornelis 1742 NX Schagen (NL) (74) Representative: Koomen, M.J.I.  Kennemerstraatweg 35 1814 GB Alkmaar 1814 GB Alkmaar (NL)