(19)

(11)

EP 0 149 666 A1

(12)

(43) Date of publication: 31.07.1985 Bulletin 1985/31 (21) Application number: 84902854.0 (22) Date of filing: 02.07.1984

(51) International Patent Classification (IPC):  B01D 61/ 36( . ) C02F 1/ 04( . ) B01D 3/ 00( . ) (86) International application number: PCT/US1984/001024 (87) International publication number: WO 1985/000532 (14.02.1985 Gazette 1985/04)

(84) Designated Contracting States: BE DE FR GB LU NL SE (30) Priority: 05.07.1983 US 19830510942 (71) Applicant: INTERNATIONAL POWER TECHNOLOGY, INC. Palo Alto, CA 94303 (US)	(72) Inventor: CHENG, Dah, Yu Los Altos Hills, CA 94022 (US) (74) Representative: Reinländer & Bernhardt Patentanwälte  Orthstrasse 12 D-8000 München 60 D-8000 München 60 (DE)