(19)

(11)

EP 0 318 491 A1

(12)

(43) Date of publication: 07.06.1989 Bulletin 1989/23 (21) Application number: 87905234.0 (22) Date of filing: 06.08.1987

(51) International Patent Classification (IPC):  G01N 33/ 543( . ) G01N 33/ 78( . ) G01N 33/ 58( . ) (86) International application number: PCT/GB1987/000558 (87) International publication number: WO 1988/001058 (11.02.1988 Gazette 1988/04)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 06.08.1986 GB 19860019206 (71) Applicant: EKINS, Roger Philip London W1N 8AA (GB)	(72) Inventor: EKINS, Roger Philip London W1N 8AA (GB) (74) Representative: Hale, Stephen Geoffrey, et al  J.Y. & G.W. Johnson Furnival House 14/18 High Holborn London WC1V 6DE London WC1V 6DE (GB)