(19)

(11)

EP 1 238 259 A2

(12)

(88) Date of publication A3: 18.10.2001 (43) Date of publication: 11.09.2002 Bulletin 2002/37 (21) Application number: 00962679.7 (22) Date of filing: 18.09.2000

(51) International Patent Classification (IPC)7: G01N 15/12, B01D 29/00 (86) International application number: PCT/GB0003/559 (87) International publication number: WO 0102/2059 (29.03.2001 Gazette 2001/13)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 18.09.1999 GB 9922075 18.09.1999 GB 9922076 (71) Applicant: Path Tech Limited Westerham, Kent TN16 2BG (GB)	(72) Inventor: Path Tech Limited Westerham, Kent TN16 2BG (GB) (74) Representative: Lucas, Brian Ronald  Lucas & Co.135 Westhall Road WarlinghamSurrey CR6 9HJ WarlinghamSurrey CR6 9HJ (GB)