(19)

(11)

EP 0 442 984 A1

(12)

(43) Date of publication: 28.08.1991 Bulletin 1991/35 (21) Application number: 90912246.0 (22) Date of filing: 11.07.1990

(51) International Patent Classification (IPC):  A61L 9/ 12( . ) B01D 53/ 32( . ) (86) International application number: PCT/US1990/003968 (87) International publication number: WO 1991/000708 (24.01.1991 Gazette 1991/03)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 11.07.1989 US 19890378088 22.05.1990 US 19900526603 (71) Applicant: SHYDAR ADVANCED AIR CLEANING SYSTEMS, INC. Bayside, NY 11361 (US)	(72) Inventor: SHONFELD, David Bayside, NY 11360 (US) (74) Representative: Schupfner, Gerhard D.  Patentanwälte Müller, Schupfner & Gauger Postfach 17 53 D-21236 Buchholz D-21236 Buchholz (DE)