(19)

(11)

EP 0 453 477 A1

(12)

(43) Date of publication: 30.10.1991 Bulletin 1991/44 (21) Application number: 90901849.0 (22) Date of filing: 09.01.1990

(51) International Patent Classification (IPC):  B01D 53/ 04( . ) B01D 53/ 047( . ) (86) International application number: PCT/GB1990/000026 (87) International publication number: WO 1990/007970 (26.07.1990 Gazette 1990/17)

(84) Designated Contracting States: DE FR GB NL SE (30) Priority: 10.01.1989 GB 19890000506 (71) Applicant: WILLPOWER BREATHING AIR LIMITED Tamworth Staffordshire B77 5DQ (GB)	(72) Inventor: WILLIAMS, C, C, B Willpower Breathing Air Ltd. Tamworth Staffordshire B77 5DQ (GB) (74) Representative: Gee, David William  Farmhouse Court Marston Nr. Sutton Coldfield West Midlands B76 0DW Marston Nr. Sutton Coldfield West Midlands B76 0DW (GB)