(19)

(11)

EP 0 664 860 A1

(12)

(43) Date of publication: 02.08.1995 Bulletin 1995/31 (21) Application number: 94921560.0 (22) Date of filing: 07.07.1994

(51) International Patent Classification (IPC):  F16J 15/ 34( . ) F16J 15/ 447( . ) (86) International application number: PCT/CA1994/000382 (87) International publication number: WO 1995/002137 (19.01.1995 Gazette 1995/04)

(84) Designated Contracting States: AT BE CH DE ES FR GB IE IT LI NL SE (30) Priority: 09.07.1993 CA 19932100230 (71) Applicant: REVOLVE TECHNOLOGIES INC. Calgary, Alberta T2R 0B3 (CA)	(72) Inventors: PETERSON, Robert, Arvid Calgary, Alberta T3L 1A2 (CA) EVENSON, Robert, S. Calgary, Alberta T3G 3M9 (CA) BEAR, Clayton Calgary, Alberta T3B 4J1 (CA) (74) Representative: Blanco White, Henry Nicholas, et al  ABEL & IMRAY Northumberland House 303-306 High Holborn London WC1V 7LH London WC1V 7LH (GB)