Patent ID: 6114264
Filing Date: 2000-09-05
Classification: C03C,Y10S

Abstract:
A neutral gray colored glass composition having a base glass portion comprising: SiO.sub.2 66 [-] to 75 percent by weight Na.sub.2 O 10 [-] to 20 percent by weight CaO 5 [-] to 15 percent by weight MgO 0 [-] to 5 percent by weight Al.sub.2 O.sub.3 0 [-] to 5 percent by weight K.sub.2 O 0 [-] to 5 percent by weight  and a colorant portion consisting essentially of: Fe.sub.2 O.sub.3 (total iron) 0.32 to 0.70 percent by weight FeO up to [0.21] 0.19 percent by weight CoO 3 [- 50] to 35 PPM Se 1 [- 15] to 10 PPM  wherein the color of the glass is characterized by dominant wavelengths in the range of 480 to 555 nanometers, an excitation purity of no higher than 8 percent and a luminous transmittance of 70 percent or greater at a thickness of 3.9 millimeters.