(19)

(11)

EP 0 122 259 A1

(12)

(43) Date of publication: 24.10.1984 Bulletin 1984/43 (21) Application number: 82903541.0 (22) Date of filing: 14.10.1982

(51) International Patent Classification (IPC):  F16L 15/ 00( . ) E21B 33/ 038( . ) E21B 17/ 02( . ) (86) International application number: PCT/US1982/001474 (87) International publication number: WO 1984/001610 (26.04.1984 Gazette 1984/11)

(84) Designated Contracting States: DE FR GB NL (71) Applicant: FMC CORPORATION Chicago Illinois 60601 (US)	(72) Inventor: SMITH, Michael, Leonard Kew Surrey TW9 3DH (GB)