(19)

(11)

EP 0 756 706 A1

(12)

(43) Date of publication: 05.02.1997 Bulletin 1997/06 (21) Application number: 94916559.0 (22) Date of filing: 22.04.1994

(51) International Patent Classification (IPC):  G01N 21/ 53( . ) G01N 15/ 02( . ) (86) International application number: PCT/US1994/004492 (87) International publication number: WO 1995/029399 (02.11.1995 Gazette 1995/47)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (71) Applicant: BHA GROUP, INC. Kansas City, MO 64133 (US)	(72) Inventors: SANTSCHI, Mark Lee's Summit, MO 64064 (US) VAN VICKLE, Brian Pleasant Valley, MO 64068 (US) REINSCH, Ted Kansas City, MO 64137 (US) (74) Representative: Goodman, Christopher  Eric Potter & Clarkson 1 St. Mary's Court St Mary's Gate Nottingham NG1 1LE Nottingham NG1 1LE (GB)