(19)

(11)

EP 0 419 568 A1

(12)

(43) Date of publication: 03.04.1991 Bulletin 1991/14 (21) Application number: 89907585.0 (22) Date of filing: 13.06.1989

(51) International Patent Classification (IPC):  B01D 15/ 08( . ) G01N 30/ 18( . ) G01N 30/ 60( . ) G01N 30/ 38( . ) (86) International application number: PCT/US1989/002587 (87) International publication number: WO 1989/012491 (28.12.1989 Gazette 1989/30)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 17.06.1988 US 19880208320 (71) Applicant: SNYDER, Thomas A. Willow Grove, PA 19090 (US)	(72) Inventor: SNYDER, Thomas A. Willow Grove, PA 19090 (US) (74) Representative: Wilcken, Thomas, Dipl.-Ing.  Patentanwälte Wilcken & Vollmann Musterbahn 1 D-23552 Lübeck D-23552 Lübeck (DE)