(19)

(11)

EP 0 879 440 A1

(12)

(43) Date of publication: 25.11.1998 Bulletin 1998/48 (21) Application number: 97901169.0 (22) Date of filing: 24.01.1997

(51) International Patent Classification (IPC):  G02F 1/ 163( . ) (86) International application number: PCT/GB1997/000199 (87) International publication number: WO 1997/028484 (07.08.1997 Gazette 1997/34)

(84) Designated Contracting States: DE FR GB (30) Priority: 02.02.1996 GB 19960002187 02.02.1996 GB 19960002169 (71) Applicant: PILKINGTON PLC St. Helens, Merseyside WA10 3TT (GB)	(72) Inventor: BATCHELOR, Richard, Anders Merseyside PR8 2AZ (GB) (74) Representative: Halliwell, Anthony Charles, et al  Pilkington plc, Group Patents Department, Pilkington Technology Centre, Hall Lane, Lathom Ormskirk, Lancashire L40 5UF Ormskirk, Lancashire L40 5UF (GB)