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(11)

EP 0 891 571 A1

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(43) Date of publication: 20.01.1999 Bulletin 1999/03 (21) Application number: 97915599.0 (22) Date of filing: 04.04.1997

(51) International Patent Classification (IPC):  G02B 6/ 44( . ) (86) International application number: PCT/GB1997/000950 (87) International publication number: WO 1997/038338 (16.10.1997 Gazette 1997/44)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IT LI NL PT SE (30) Priority: 04.04.1996 GB 19960007149 (71) Applicant: N.V. RAYCHEM S.A. 3010 Kessel-Lo (BE)	(72) Inventors: DAEMS, Daniel B-2970 'S-Gravenwezel (BE) VERNIMMEN, Michel B-3971 Leopoldsburg (BE) JORIS, Albert B-3630 Maas-Mechelen (BE) (74) Representative: Clayton, Anthony Nicholas, et al  Raychem Limited Intellectual Property Law Dept. Faraday Road Dorcan Swindon, Wiltshire SN3 5HH Swindon, Wiltshire SN3 5HH (GB)