(19)

(11)

EP 0 569 422 A1

(12)

(43) Date of publication: 18.11.1993 Bulletin 1993/46 (21) Application number: 92903601.0 (22) Date of filing: 30.01.1992

(51) International Patent Classification (IPC):  B01D 35/ 18( . ) F02M 31/ 16( . ) F02B 3/ 06( . ) F02M 31/ 10( . ) F02B 1/ 04( . ) (86) International application number: PCT/GB1992/000180 (87) International publication number: WO 1992/014048 (20.08.1992 Gazette 1992/22)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU MC NL SE (30) Priority: 01.02.1991 GB 19910002217 24.10.1991 GB 19910022586 31.10.1991 GB 19910023135 (71) Applicant: 334455 ONTARIO INC. Huntsville, Ontario P0A 1K0 (CA)	(72) Inventors: COOK, Alan Robert Hemel Hempstead Hertfordshire HP3 0BS (GB) MALONEY, Charles Vincent Stevenage, Hertfordshire SG2 9HY (GB) SEEAR, George Newport Pagnell Bedfordshire MK16 8EN (GB) (74) Representative: Shaw, Laurence  5th Floor, Metropolitan House, 1 Hagley Road, Edgbaston Birmingham B16 8TG Birmingham B16 8TG (GB)