The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 02, 2010
Filed:
Nov. 02, 2007
Kazuhiro Suzuki, Yokohama, JP;
Manabu Nishizawa, Yokohama, JP;
Seiji Miyazaki, Yokohama, JP;
Junichiro Kase, Yokohama, JP;
Kei Maeda, Yokohama, JP;
Kazuhiro Suzuki, Yokohama, JP;
Manabu Nishizawa, Yokohama, JP;
Seiji Miyazaki, Yokohama, JP;
Junichiro Kase, Yokohama, JP;
Kei Maeda, Yokohama, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
To provide an alkali free glass which is suitable as a glass substrate for LCD and has few defects of bubbles and an undissolved starting material, and a process for producing an alkali free glass which can readily lower the defects in bubbles and an undissolved starting material. An alkali free glass with a matrix composition comprising SiO, AlO, BO, MgO, CaO, SrO and BaO and containing substantially no alkali metal oxide, of which the temperature at which the viscosity becomes 10dPa·s, is at most 1,600° C. and which contains sulfur in an amount of from 0.001 to 0.1% as calculated as SO, as represented by the mass percentage, per 100% of the total amount of the above matrix composition, and a process for producing a glass which comprises preparing a starting material and melting it so that a sulfate be incorporated to the starting material in an amount of from 0.01 to 5% as calculated as SO, as represented by the mass percentage, per 100% of the total amount of the above matrix composition.