(19)

(11)

EP 0 692 079 A1

(12)

(43) Date of publication: 17.01.1996 Bulletin 1996/03 (21) Application number: 94911243.0 (22) Date of filing: 30.03.1994

(51) International Patent Classification (IPC):  F01K 23/ 10( . ) F16K 11/ 052( . ) F16K 1/ 20( . ) F16K 31/ 44( . ) (86) International application number: PCT/GB1994/000673 (87) International publication number: WO 1994/023187 (13.10.1994 Gazette 1994/23)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI NL (30) Priority: 31.03.1993 GB 19930006772 (71) Applicant: WES TECHNOLOGY INC. Santa Ana, CA 92704 (US)	(72) Inventors: SQUIRRELL, Anton, Frederick CH-5507 Mellingen (CH) KOCH, William, F. Auburn, ME 04210 (US) (74) Representative: Whalley, Kevin, et al  MARKS & CLERK, 57-60 Lincoln's Inn Fields London WC2A 3LS London WC2A 3LS (GB)