(19)

(11)

EP 0 944 804 A1

(12)

(43) Date of publication: 29.09.1999 Bulletin 1999/39 (21) Application number: 97937662.0 (22) Date of filing: 19.08.1997

(51) International Patent Classification (IPC):  F25J 3/ 00( . ) F25J 3/ 04( . ) (86) International application number: PCT/GB1997/002214 (87) International publication number: WO 1998/008039 (26.02.1998 Gazette 1998/08)

(84) Designated Contracting States: AT BE DE ES FI FR GB IE IT NL SE (30) Priority: 20.08.1996 GB 19960017413 (71) Applicant: IMI MARSTON LIMITED Fordhouses Wolverhampton WV10 6QJ (GB)	(72) Inventors: CHATWIN, Christopher John Penkridge, Staffordshire ST19 5JG (GB) CLINTON, Richard Anthony Telford, Shropshire TF2 8PH (GB) (74) Representative: Moore, John Hamilton  J. H. Moore & Co., 8 Gaiafields Road Lichfield, Staffs. WS13 7LT Lichfield, Staffs. WS13 7LT (GB)