Patent ID: 7141521

Claim:
A float glass comprising: platinum, wherein the concentration of said platinum is in the range of greater than zero to less than 300 parts per billion; a concentration of rhodium in the range of zero to less than 30 parts per billion; a concentration of zinc oxide in the range of zero to less than 1.5 weight percent; a concentration of tin dioxide in the range of zero to less than 1 weight percent; said concentrations of said platinum, said rhodium, said zinc oxide, and said tin dioxide configuring said float glass to have minimized surface defects; and said float glass being configured to be one of: prestressable into a glass-ceramic comprising one of: high quartz mixed crystals; and keatite mixed crystals; and transformable into a glass-ceramic comprising one of: high quartz mixed crystals; and keatite mixed crystals.