(19)

(11)

EP 0 443 025 A1

(12)

(43) Date of publication: 28.08.1991 Bulletin 1991/35 (21) Application number: 90916665.0 (22) Date of filing: 13.09.1990

(51) International Patent Classification (IPC):  G02F 1/ 13( . ) G02B 27/ 01( . ) G09F 9/ 00( . ) G02B 27/ 00( . ) A42B 3/ 04( . ) G02B 27/ 02( . ) G02B 5/ 30( . ) (86) International application number: PCT/US1990/005205 (87) International publication number: WO 1991/004508 (04.04.1991 Gazette 1991/08)

(84) Designated Contracting States: CH DE FR GB LI (30) Priority: 14.09.1989 US 19890407178 11.06.1990 US 19900535617 (71) Applicant: GENERAL ELECTRIC COMPANY Schenectady, NY 12345 (US)	(72) Inventors: HENKES, John, Lawrence Latham, NY 12110 (US) BIGELOW, John, Edward Rexford, NY 12148 (US) (74) Representative: Pratt, Richard Wilson, et al  London Patent Operation G.E. Technical Services Co. Inc. Essex House 12/13 Essex Street London WC2R 3AA London WC2R 3AA (GB)