Patent 7323426 was granted and assigned to Corning Incorporated on January, 2008 by the United States Patent and Trademark Office.
A family of glasses from the SiO2—Al2O3—P2O5 ternary system exhibiting high strain point, transparency, and low coefficient of thermal expansion. The glasses have the following composition, expressed in mol percent and calculated from the glass batch on an oxide basis: 55-80 SiO2, 12-30 Al2O3, and 2-15 P2O5.