(19)

(11)

EP 0 236 441 A1

(12)

(43) Date of publication: 16.09.1987 Bulletin 1987/38 (21) Application number: 86905622.0 (22) Date of filing: 04.09.1986

(51) International Patent Classification (IPC):  G01N 27/ 16( . ) G01N 33/ 00( . ) (86) International application number: PCT/US1986/001828 (87) International publication number: WO 1987/001453 (12.03.1987 Gazette 1987/06)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 09.09.1985 US 19850773870 (71) Applicant: SONOXCO, INC. Mountain View, CA 94043 (US)	(72) Inventors: DALLA BETTA, Ralph, A. Mountain View, CA 94040 (US) SHERIDAN, David, R. Mountain View, CA 94043 (US) (74) Representative: Pendlebury, Anthony, et al  PAGE, WHITE & FARRER 54 Doughty Street London WC1N 2LS London WC1N 2LS (GB)