Patent ID: 6284687
Filing Date: 2001-09-04
Classification: C03C,Y10S

Abstract:
High refractive index glasses having the following composition of oxides, expressed in percentages by weight:SiO.sub.2 29-35 B.sub.2 O.sub.3 0.5-5 Li.sub.2 O 0.5-3 Na.sub.2 O 4-8 K.sub.2 O 0-2 PbO 28-40 BaO 4-14 La.sub.2 O.sub.3 4-12 TiO.sub.2 3-8 ZnO 0-8 ZrO.sub.2 0-4 Nb.sub.2 O.sub.5 0-5 with: Li.sub.2 O + Na.sub.2 O + K.sub.2 O 5.5-9.