(19)

(11)

EP 1 117 900 A1

(12)

(43) Date of publication: 25.07.2001 Bulletin 2001/30 (21) Application number: 99969465.6 (22) Date of filing: 24.09.1999

(51) International Patent Classification (IPC)7: E21B 19/22, B66D 3/00, E02D 1/02 (86) International application number: PCT/NL9900/596 (87) International publication number: WO 0017/481 (30.03.2000 Gazette 2000/13)

(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: 24.09.1998 NL 1010179 (71) Applicant: Hydro-Nautic Services 2315 Leiden (NL)	(72) Inventor: VAN DE MEIDE, Hans NL-2315 CD Leiden (NL) (74) Representative: 't Jong, Bastiaan Jacobus et al Arnold & Siedsma,Advocaten en Octrooigemachtigden,Sweelinckplein 1 2517 GK Den Haag 2517 GK Den Haag (NL)