(19)

(11)

EP 0 304 477 A1

(12)

(43) Date of publication: 01.03.1989 Bulletin 1989/09 (21) Application number: 88903040.0 (22) Date of filing: 07.03.1988

(51) International Patent Classification (IPC):  G01N 21/ 88( . ) G01N 21/ 952( . ) (86) International application number: PCT/US1988/000660 (87) International publication number: WO 1988/007190 (22.09.1988 Gazette 1988/21)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 09.03.1987 US 19870023324 (71) Applicant: BATTELLE MEMORIAL INSTITUTE Columbus Ohio 43201-2693 (US)	(72) Inventors: BRENDEN, Byron, B. Richland, WA 99352 (US) PETERS, Timothy, J. Richland, WA 99352 (US) (74) Representative: Dousse, Blasco, et al  7, route de Drize CH-1227 Carouge/Genève CH-1227 Carouge/Genève (CH)