(19)

(11)

EP 0 144 376 A1

(12)

(43) Date of publication: 19.06.1985 Bulletin 1985/25 (21) Application number: 84902037.0 (22) Date of filing: 17.05.1984

(51) International Patent Classification (IPC):  B03B 9/ 00( . ) B03D 3/ 06( . ) B03C 1/ 01( . ) (86) International application number: PCT/GB1984/000169 (87) International publication number: WO 1984/004701 (06.12.1984 Gazette 1984/28)

(84) Designated Contracting States: DE FR GB (30) Priority: 21.05.1983 GB 19830014138 (71) Applicant: The British Petroleum Company p.l.c. London EC2Y 9BU (GB)	(72) Inventor: REESON, Stephen, John Kingston Upon Thames Surrey KT2 7BL (GB) (74) Representative: Ryan, Edward Terrence, et al  BP INTERNATIONAL LIMITED, Patents Division Chertsey Road Sunbury-on-Thames Middlesex, TW16 7LN Sunbury-on-Thames Middlesex, TW16 7LN (GB)