(19)

(11)

EP 0 546 039 A1

(12)

(43) Date of publication: 16.06.1993 Bulletin 1993/24 (21) Application number: 91915832.0 (22) Date of filing: 28.08.1991

(51) International Patent Classification (IPC):  C11D 1/ 22( . ) C11D 3/ 37( . ) C11D 3/ 22( . ) C11D 17/ 00( . ) (86) International application number: PCT/GB1991/001448 (87) International publication number: WO 1992/003532 (05.03.1992 Gazette 1992/06)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 28.08.1990 GB 19900018779 (71) Applicant: JEYES LIMITED Norfolk IP24 1HA (GB)	(72) Inventors: BLACK, Steven, John, Farrell Carluke ML8 4LX (GB) MARSHALL, John Norwich Norfolk NR4 6LT (GB) WILSON, Brian, Murie Glasgow G74 4DN (GB) (74) Representative: Lamb, John Baxter  MARKS & CLERK, 57-60 Lincoln's Inn Fields London WC2A 3LS London WC2A 3LS (GB)