(19)

(11)

EP 0 433 331 A1

(12)

(43) Date of publication: 26.06.1991 Bulletin 1991/26 (21) Application number: 89909816.0 (22) Date of filing: 18.08.1989

(51) International Patent Classification (IPC):  B64D 47/ 00( . ) G10K 11/ 178( . ) B64C 1/ 40( . ) (86) International application number: PCT/GB1989/000964 (87) International publication number: WO 1990/003026 (22.03.1990 Gazette 1990/07)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 06.09.1988 GB 19880020922 (71) Applicant: TOPEXPRESS LIMITED Cambridge CB3 0RD (GB)

(72) Inventors: ROSS, Colin Fraser Stapleford, Cambridge CB2 5BP (GB) DORLING, Christopher Mark Cambridge CB4 2QR (GB) EATWELL, Graham Paul Cambridge CB3 7NZ (GB) LANGLEY, Andrew John Brighton, East Sussex BN4 2DE (GB) SUTCLIFFE, Sean George Cronin Cambridge CB1 3BE (GB) JOHNSTON, John Andrew Cambridge CB4 1RT (GB) (74) Representative: Nash, Keith Wilfrid  KEITH W. NASH & Co. Pearl Assurance House 90-92 Regent Street Cambridge CB2 1DP Cambridge CB2 1DP (GB)