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:
Aug. 19, 2025
Filed:
Jun. 30, 2021
Nippon Sheet Glass Company, Limited, Tokyo, JP;
Akira Kitayama, Osaka, JP;
Junji Kurachi, Hyogo, JP;
NIPPON SHEET GLASS COMPANY, LIMITED, Tokyo, JP;
Abstract
The present disclosure provides a glass composition for chemical strengthening, the glass composition having a high alkali resistance and being suitable for achieving both the surface compressive stress and the compressive stress layer depth. The glass composition according to the present disclosure includes, as components, in mol %: 60 to 80% SiO; 1 to 5% AlO; 5 to 25% MgO; 0 to 5% CaO; 10 to 20% NaO; and 0 to 10% KO. A chemically strengthened glass article, for example, having a surface compressive stress of 650 to 950 MPa and a compressive stress layer depth of 7 to 17 μm can be provided using the glass composition.