(19)

(11)

EP 0 195 042 A1

(12)

(43) Date of publication: 24.09.1986 Bulletin 1986/39 (21) Application number: 85904660.0 (22) Date of filing: 19.09.1985

(51) International Patent Classification (IPC):  E21B 7/ 20( . ) F16L 55/ 165( . ) E21B 7/ 30( . ) (86) International application number: PCT/GB1985/000433 (87) International publication number: WO 1986/001846 (27.03.1986 Gazette 1986/07)

(84) Designated Contracting States: AT BE CH DE FR IT LI LU NL SE (30) Priority: 19.09.1984 GB 19840023678 07.11.1984 GB 19840028141 (71) Applicant: Yarnell, Ian Roland West Sussex GU29 9TN (GB)	(72) Inventor: Yarnell, Ian Roland West Sussex GU29 9TN (GB)