(19)

(11)

EP 0 352 319 A1

(12)

(43) Date of publication: 31.01.1990 Bulletin 1990/05 (21) Application number: 89902062.0 (22) Date of filing: 27.01.1989

(51) International Patent Classification (IPC):  G01N 31/ 16( . ) G01N 33/ 18( . ) (86) International application number: PCT/GB1989/000077 (87) International publication number: WO 1989/007266 (10.08.1989 Gazette 1989/18)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 29.01.1988 GB 19880002069 (71) Applicant: ANALAQ LIMITED Exeter EX2 7HR (GB)	(72) Inventors: DALE, Bryan Exwick Exeter Devon EX4 2EQ (GB) LEE, Peter, George Broadclyst Exeter Devon EX5 3DX (GB) (74) Representative: Newby, John Ross, et al  J.Y. & G.W. Johnson Furnival House 14/18 High Holborn London WC1V 6DE London WC1V 6DE (GB)