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:
Feb. 21, 2023
Filed:
Mar. 16, 2020
Agc Inc., Tokyo, JP;
Motoyuki Hirose, Tokyo, JP;
Takashi Enomoto, Tokyo, JP;
AGC INC., Tokyo, JP;
Abstract
An alkali-free glass substrate contains, as represented by mass % based on oxides: 54% to 66% of SiO; 10% to 23% of AlO; 6% to 12% of BO; and 8% to 26% of MgO+CaO+SrO+BaO. The alkali-free glass substrate has β-OH of 0.15 mmto 0.5 mm, and a Cl content of 0.1 to 0.35 mass %. A bubble growth index I of the alkali-free glass substrate given by the following formula is 280 or more: I=590.5×[β-OH]+874.1×[Cl]−5.7×[BO]−33.3. In the formula, [β-OH] is β-OH of the alkali-free glass substrate in mm, [Cl] is the Cl content of the alkali-free glass substrate in mass %, and [BO] is a BOcontent of the alkali-free glass substrate in mass %.