Patent ID: 7691763
Filing Date: 2010-04-06
Classification: C03C

Abstract:
1. A float glass composition for forming a blue colored glass, comprising: a base glass portion comprising: a. SiO b. Na c. CaO from 5 to 15 weight percent; d. MgO from 0 to 5 weight percent; e. Al f. B g. K additives consisting essentially of: total iron from 0.3 to 1.2 weight percent; a first additive compound comprising Nd CuO in an amount up to 0.3 weight percent based on the total weight of the glass composition; and optionally one or more second additive compounds selected from CoO, Cr wherein the redox ratio of the composition ranges from 0.35 to 0.40 and the glass has a blue color characterized by a dominant wavelength in the range of 480 nm to 495 nm and an excitation purity no greater than 18 percent and an Lta of at least 70% at a thickness of 0.154 inches.