(19)

(11)

EP 0 422 106 A1

(12)

(43) Date of publication: 17.04.1991 Bulletin 1991/16 (21) Application number: 89908008.0 (22) Date of filing: 12.06.1989

(51) International Patent Classification (IPC):  G02B 6/ 36( . ) G02B 6/ 42( . ) (86) International application number: PCT/US1989/002542 (87) International publication number: WO 1990/000260 (11.01.1990 Gazette 1990/02)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI NL SE (30) Priority: 30.06.1988 US 19880213642 (71) Applicant: RAYNET CORPORATION Menlo Park, CA 94025 (US)	(72) Inventors: UKEN, William, David Fremont, CA 94539 (US) RATZLAFF, Thomas, D. Menlo Park, CA 94025 (US) (74) Representative: Hall, Robert Leonard, et al  Raychem Limited Intellectual Property Law Department Faraday Road Dorcan Swindon, Wiltshire SN3 5HH Swindon, Wiltshire SN3 5HH (GB)