Patent ID: 9145330
Filing Date: 2015-09-29
Classification: C03C

Abstract:
1. A photochromic glass, comprising: a glass matrix that is at least substantially free of rare earth elements, comprising in weight percent (wt %) based on oxides: 48 wt %≦SiO 15 wt %≦B 5 wt %≦Al 2.5 wt %≦ZrO 2 wt %≦Li 0 wt %≦Na 3 wt %≦K 0 wt %≦MgO≦2 wt %; 0 wt %≦CaO≦2 wt %; 0 wt %≦SrO≦2 wt %; 0 wt %≦BaO≦2 wt %; 0 wt %≦TiO 2 wt %≦Nb a plurality of photochromic agents, comprising in weight percent (wt %) with respect to the glass matrix: 0.100 wt %≦Ag≦0.250 wt %; 0.200 wt %≦Cl≦0.500 wt %; 0.0100 wt %≦Br≦0.300 wt %; and 0.0050 wt %≦CuO≦0.0110 wt %.