(19)

(11)

EP 0 435 944 A1

(12)

(43) Date of publication: 10.07.1991 Bulletin 1991/28 (21) Application number: 89911270.0 (22) Date of filing: 22.09.1989

(51) International Patent Classification (IPC):  C02F( . ) A23C 9/ 15( . ) A61L 2/ 02( . ) C02F 1/ 44( . ) C02F 1/ 68( . ) C02F 103/ 04( . ) A23L 2/ 00( . ) A61K 9/ 08( . ) B01D 61/ 00( . ) C02F 1/ 50( . ) C02F 101/ 00( . ) (86) International application number: PCT/GB1989/001119 (87) International publication number: WO 1990/003333 (05.04.1990 Gazette 1990/08)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 23.09.1988 GB 19880022470 (71) Applicant: HAMPSHIRE ADVISORY AND TECHNICAL SERVICES LIMITED Upper Shirley Southampton S01 5JD (GB)	(72) Inventors: WILSON, Michael London N1 5SU (GB) MONRO, Philip 39 South View Road Southampton S01 5JD (GB) (74) Representative: Leyh, Hans, Dr.-Ing., et al  Patentanwälte Berendt, Leyh & Hering Innere Wiener Strasse 20 D-81667 München D-81667 München (DE)