(19)

(11)

EP 0 808 372 A1

(12)

(43) Date of publication: 26.11.1997 Bulletin 1997/48 (21) Application number: 96905771.0 (22) Date of filing: 16.02.1996

(51) International Patent Classification (IPC):  A01H 4/ 00( . ) C12N 15/ 84( . ) C12N 15/ 82( . ) (86) International application number: PCT/EP1996/000712 (87) International publication number: WO 1996/025504 (22.08.1996 Gazette 1996/38)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU NL PT SE (30) Priority: 17.02.1995 GB 19950003099 (71) Applicant: SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V. 2596 HR Den Haag (NL)	(72) Inventors: EDWARDS, Glyn Alyn Faversham, Kent ME13 8NW (GB) FUELL, Keith Jan Bredgar, Sittingbourne ME9 8AG (GB) LAINE, Eric Max-Marie 80680 Hebecourt (FR) MUSSIO, Isabelle Sylveie 91600 Savigny-sur-Orge (FR)