(19)

(11)

EP 0 628 096 A1

(12)

(43) Date of publication: 14.12.1994 Bulletin 1994/50 (21) Application number: 93906271.0 (22) Date of filing: 26.02.1993

(51) International Patent Classification (IPC):  B01D 53/ 32( . ) C01B 23/ 00( . ) C01B 21/ 04( . ) (86) International application number: PCT/US1993/001829 (87) International publication number: WO 1993/017156 (02.09.1993 Gazette 1993/21)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 28.02.1992 US 19920842920 (71) Applicant: CERAMATEC, INC. Salt Lake City, UT 84119 (US)	(72) Inventors: NACHLAS, Jesse A. Salt Lake City, UT 84105 (US) TAYLOR, Dale M. Salt Lake City, UT 84105 (US) (74) Representative: Rambelli, Paolo, et al  c/o JACOBACCI & PERANI S.p.A. Corso Regio Parco, 27 I-10152 Torino I-10152 Torino (IT)