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:
Oct. 22, 2024
Filed:
Sep. 10, 2020
Applicant:
Agc Inc., Tokyo, JP;
Inventors:
Hirofumi Tokunaga, Tokyo, JP;
Kazutaka Ono, Tokyo, JP;
Assignee:
AGC INC., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C03C 3/087 (2006.01); C03C 3/091 (2006.01); G11B 5/73 (2006.01); G11B 7/2531 (2013.01);
U.S. Cl.
CPC ...
C03C 3/087 (2013.01); C03C 3/091 (2013.01); G11B 5/73921 (2019.05); G11B 7/2531 (2013.01); C03C 2201/12 (2013.01); C03C 2203/20 (2013.01);
Abstract
A glass has a density of 2.60 g/cmor lower, a Young's modulus of 88 GPa or more, a strain point of 650 to 720° C., a temperature Tat which a glass viscosity reaches 10dPa·s of 1,320° C. or lower, a glass surface devitrification temperature (T) of T+20° C. or lower, and an average coefficient of thermal expansion of 30×10to 43×10/° C. at 50 to 350° C. The glass contains, as represented by mol % based on oxides, 50 to 80% of SiO, 8 to 20% of AlO, 0 to 0.5% in total of at least one kind of alkali metal oxide selected from the group consisting of LiO, NaO and KO, and 0 to 1% of PO.