(19)

(11)

EP 0 349 552 A1

(12)

(43) Date of publication: 10.01.1990 Bulletin 1990/02 (21) Application number: 88902181.0 (22) Date of filing: 11.03.1988

(51) International Patent Classification (IPC):  C02F 1/ 48( . ) (86) International application number: PCT/GB1988/000189 (87) International publication number: WO 1988/007025 (22.09.1988 Gazette 1988/21)

(84) Designated Contracting States: AT BE CH DE FR IT LI LU NL SE (30) Priority: 11.03.1987 GB 19870005796 (71) Applicant: LIFF INDUSTRIES LIMITED Huddersfield HD4 6JF Yorkshire (GB)	(72) Inventors: ASHBEE, David, William West Yorkshire (GB) WALKER, David Huddersfield West Yorkshire (GB) (74) Representative: Orr, William McLean, et al  URQUHART-DYKES & LORD 5th Floor, Tower House Merrion Way Leeds West Yorkshire, LS2 8PA Leeds West Yorkshire, LS2 8PA (GB)