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:
Jun. 06, 2017
Filed:
Sep. 18, 2015
Asahi Glass Company, Limited, Chiyoda-ku, JP;
ASAHI GLASS COMPANY, LIMITED, Chiyoda-ku, JP;
Abstract
The present invention relates to an alkali-free glass having a strain point of 725° C. or higher, an average thermal expansion coefficient at from 50 to 300° C. of from 30×10to 40×10/° C., a temperature Tat which a glass viscosity is 10dPa·s of 1,710° C. or lower, and a temperature Tat which a glass viscosity is 10dPa·s of 1,320° C. or lower, the alkali-free glass including, in terms of mol % on the basis of oxides, SiO: 66 to 70, AlO: 12 to 15, BO: 0 to 1.5, MgO: more than 9.5 and 13 or less, CaO: 4 to 9, SrO: 0.5 to 4.5, BaO: 0 to 1, and ZrO: 0 to 2, in which MgO+CaO+SrO+BaO is from 17 to 21, MgO/(MgO+CaO+SrO+BaO) is 0.4 or more, MgO/(MgO+CaO) is 0.4 or more, MgO/(MgO+SrO) is 0.6 or more, and the alkali-free glass does not substantially contain an alkali metal oxide.