(19)

(11)

EP 0 970 501 A1

(12)

(43) Date of publication: 12.01.2000 Bulletin 2000/02 (21) Application number: 97912742.0 (22) Date of filing: 20.10.1997

(51) International Patent Classification (IPC)7: H01J 31/00, H01J 29/46, H01J 61/30, H01K 1/28, H01J 29/87 (86) International application number: PCT/US9718/684 (87) International publication number: WO 9818/151 (30.04.1998 Gazette 1998/17)

(84) Designated Contracting States: DE FR GB NL (30) Priority: 24.10.1996 US 29476 P (71) Applicant: CORNING INCORPORATED Corning, N.Y. 14831 (US)	(72) Inventors: GHOSH, Asish Slingerlands, NY 12159 (US) GULATI, Suresh, T. Elmira Heights, NY 14903 (US) (74) Representative: Ertl, Nicholas Justin et al Elkington and Fife,Prospect House,8 Pembroke Road Sevenoaks,Kent TN13 1XR Sevenoaks,Kent TN13 1XR (GB) (56) References cited: :