(19)

(11)

EP 2 057 101 A1

(12)

(43) Date of publication: 13.05.2009 Bulletin 2009/20 (21) Application number: 07734855.5 (22) Date of filing: 28.02.2007

(51) International Patent Classification (IPC):  C03C 17/00(2006.01) C03B 19/12(2006.01) (86) International application number: PCT/IB2007/001650 (87) International publication number: WO 2008/104825 (04.09.2008 Gazette 2008/36)

(84) Designated Contracting States: DE FR Designated Extension States: AL BA HR MK RS (71) Applicant: Corning Inc. Corning, NY 14831 (US)	(72) Inventors: MARSAUD, Serge, Guy F-77250 Veneux Les Sablons (FR) WONDRACZEK, Katrin F-77250 Veneux Les Sablons (FR) (74) Representative: Le Roux, Martine et al Cabinet Beau de Loménie 158, rue de l'Université 75340 Paris Cédex 07 75340 Paris Cédex 07 (FR)