Patent ID: 7829489
Filing Date: 2010-11-09
Classification: C03C

Abstract:
1. A composition for a photomachinable glass comprising: 74-81% SiO 4.5-10% Al 8.8-10.1% Li greater than zero to less than 0.3% CeO 1.5-1.7% ZnO, 1.2-1.6% Na 2.2-3.8% K >0 to 0.25% Sb less than 0.1% SnO from greater than zero up to 0.3% of at least one metal selected from the group of gold (Au) and silver (Ag), or mixtures thereof, provided that the sum of Au+Ag is not greater than 0.3%, wherein said glass has a coefficient of thermal expansion less than 6×10