(19)

(11)

EP 0 639 221 A1

(12)

(43) Date of publication: 22.02.1995 Bulletin 1995/08 (21) Application number: 92909554.0 (22) Date of filing: 22.05.1992

(51) International Patent Classification (IPC):  C10L 5/ 04( . ) C10L 5/ 40( . ) C10L 5/ 20( . ) (86) International application number: PCT/GB1992/000933 (87) International publication number: WO 1992/020766 (26.11.1992 Gazette 1992/29)

(84) Designated Contracting States: BE DE ES FR GB NL (30) Priority: 22.05.1991 GB 19910011021 (71) Applicant: DARBY, William Frederick Swansea, West Glamorgan SA1 4QJ (GB)	(72) Inventor: DARBY, William Frederick Swansea, West Glamorgan SA1 4QJ (GB) (74) Representative: Powell, Stephen David, et al  WILLIAMS, POWELL & ASSOCIATES 34 Tavistock Street London WC2E 7PB London WC2E 7PB (GB)