Patent ID: 8127571

Claim:
A method of refining a lithium aluminosilicate glass, comprising: (A) adding a sulfide to glass batch materials in an amount of at least 0.05% by weight relative to a total weight of the glass batch materials; and (B) melting the materials at a temperature below 1750° C.; wherein the lithium aluminosilicate glass is free of arsenic oxide, antimony oxide, and tin oxide; the lithium aluminosilicate glass is a glass comprising constituents below in amounts specified in percentages by weight: SiO 2 52-75% Al 2 O 3 18-27% Li 2 O 2.5-5.5% K 2 O 0-3% Na 2 O 0-3% ZnO 0-3.5% MgO 0-3% CaO 0-2.5% BaO 0-3.5% SrO 0-2% TiO 2 1.2-5.5% ZrO 2 0-3% P 2 O 5 0-8%.