Patent ID: 8273672
Filing Date: 2012-09-25
Classification: C03C

Abstract:
1. An optical glass, comprising: a refractive index (n wherein a Bi wherein the optical glass has at least one of the properties of being substantially free from opacification and/or being substantially devitrified within the glass body under the conditions of the following reheating test (a), and wherein, a test piece of 15 mm by 15 mm by 30 mm is reheated, such that the test piece is heated from room temperature to a temperature of 80 degrees C. higher than its transition temperature (Tg) for a period of 150 minutes, maintained for 30 minutes at the temperature of 80 degrees C. higher than the glass transition temperature (Tg) of the optical glass, allowed to cool to an ambient temperature, and finally observed visually after polishing the opposing two sides of the test piece to a thickness of 10 mm.