(19)

(11)

EP 0 719 239 A1

(12)

(43) Date of publication: 03.07.1996 Bulletin 1996/27 (21) Application number: 93923113.0 (22) Date of filing: 16.09.1993

(51) International Patent Classification (IPC):  B01D 21/ 00( . ) C02F 3/ 12( . ) C02F 3/ 00( . ) (86) International application number: PCT/US1993/008760 (87) International publication number: WO 1995/007862 (23.03.1995 Gazette 1995/13)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (71) Applicant: Beard, Harold J. Baton Rouge Louisiana 70806 (US)	(72) Inventor: Beard, Harold J. Baton Rouge Louisiana 70806 (US) (74) Representative: MacGregor, Gordon, et al  ERIC POTTER CLARKSON St. Mary's Court St. Mary's Gate Nottingham, NG1 1LE Nottingham, NG1 1LE (GB)