(19)

(11)

EP 1 025 359 A1

(12)

(43) Date of publication: 09.08.2000 Bulletin 2000/32 (21) Application number: 98923953.8 (22) Date of filing: 27.05.1998

(51) International Patent Classification (IPC)7: F04B 47/04 (86) International application number: PCT/CA9800/525 (87) International publication number: WO 9855/766 (10.12.1998 Gazette 1998/49)

(84) Designated Contracting States: AT BE CH DE DK FI GB LI NL SE (30) Priority: 02.06.1997 US 867536 28.04.1998 US 66960 (71) Applicant: Ecoquip Artificial Lift Ltd. Calgary,Alberta T2W 5M2 (CA)	(72) Inventors: SCHULTZ, Glenn Calgary, Alberta T2J 1P6 (CA) RING, Curtis, P. Okotoks, Alberta T0L 1T2 (CA) GRABILL, Les Calgary, Alberta T2W 5M2 (CA) (74) Representative: Leale, Robin George et al Frank B. Dehn & Co.,European Patent Attorneys,179 Queen Victoria Street London EC4V 4EL London EC4V 4EL (GB)