(19)

(11)

EP 0 042 379 A1

(12)

(43) Date of publication: 30.12.1981 Bulletin 1981/52 (21) Application number: 80900942.0 (22) Date of filing: 19.12.1979

(51) International Patent Classification (IPC):  B01D 53/ 24( . ) B01D 59/ 20( . ) (86) International application number: PCT/US1979/001151 (87) International publication number: WO 1981/001801 (09.07.1981 Gazette 1981/16)

(84) Designated Contracting States: AT CH DE FR GB NL SE (71) Applicant: WANG, Chia Gee Millwood, NY 10546 (US)	(72) Inventor: WANG, Chia Gee Millwood, NY 10546 (US)