(19)

(11)

EP 0 563 052 A1

(12)

(43) Date of publication: 06.10.1993 Bulletin 1993/40 (21) Application number: 91919014.0 (22) Date of filing: 26.04.1991

(51) International Patent Classification (IPC):  B01D 35/ 02( . ) B01J 4/ 00( . ) F04D 15/ 00( . ) F04D 29/ 60( . ) B01D 35/ 26( . ) B23Q 11/ 00( . ) F04D 29/ 40( . ) (86) International application number: PCT/US1991/002897 (87) International publication number: WO 1991/016541 (31.10.1991 Gazette 1991/25)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 26.04.1990 US 19900514752 (71) Applicant: HENRY FILTERS, INC. Bowling Green, OH 43402 (US)	(72) Inventor: McEVEN, Stephen, N. Bowling Green, OH 43402 (US) (74) Representative: Pidgeon, Robert John  Appleyard Lees & Co. 15 Clare Road Halifax West Yorkshire HX1 2HY Halifax West Yorkshire HX1 2HY (GB)