(19)

(11)

EP 0 332 630 A1

(12)

(43) Date of publication: 20.09.1989 Bulletin 1989/38 (21) Application number: 87907609.0 (22) Date of filing: 23.11.1987

(51) International Patent Classification (IPC):  B67D 3/ 00( . ) G01F 11/ 32( . ) (86) International application number: PCT/GB1987/000834 (87) International publication number: WO 1988/003909 (02.06.1988 Gazette 1988/12)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 22.11.1986 GB 19860027974 (71) Applicant: DELTIC (LIVERPOOL) LIMITED Ainsdale, Southport Merseyside PR8 2S4 (GB)	(72) Inventor: DELANEY, Francis, Alfred Southport Merseyside (GB) (74) Representative: Lyons, Andrew John, et al  ROYSTONS Tower Building Water Street Liverpool L3 1BA Liverpool L3 1BA (GB)