(19)

(11)

EP 0 793 889 A1

(12)

(43) Date of publication: 10.09.1997 Bulletin 1997/37 (21) Application number: 96922118.0 (22) Date of filing: 27.06.1996

(51) International Patent Classification (IPC):  H04Q 3/ 62( . ) (86) International application number: PCT/GB1996/001566 (87) International publication number: WO 1997/001933 (16.01.1997 Gazette 1997/04)

(84) Designated Contracting States: DE FR GB (30) Priority: 29.06.1995 GB 19950013249 (71) Applicant: Microvitec PLC Chester CH1 4QR (GB)	(72) Inventor: MECHAN, Terence, John, Edward Olympic Communic. Wrexham LL13 9UE (GB) (74) Representative: Crawford, Andrew Birkby, et al  A.A. THORNTON & CO. Northumberland House 303-306 High Holborn London WC2A 1AY London WC2A 1AY (GB)