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. 13, 2024
Filed:
Jul. 08, 2022
Agc Inc., Tokyo, JP;
Hirofumi Tokunaga, Tokyo, JP;
Kazutaka Ono, Tokyo, JP;
AGC Inc., Tokyo, JP;
Abstract
An alkali free glass has an average coefficient of thermal expansion at 50 to 350° C. of 30×10to 43×10/° C., a Young's modulus of 88 GPa or more, a strain point of 650 to 725° C., a temperature Tat which a viscosity reaches 10dPa·s of 1,290° C. or lower, a glass surface devitrification temperature (T) of T+20° C. or lower, and a temperature Tat which the viscosity reaches 10dPa·s of 1,680° C. or lower. The alkali free glass contains, as represented by mol % based on oxides, 62 to 67% of SiO, 12.5 to 16.5% of AlO, 0 to 3% of BO, 8 to 13% of MgO, 6 to 12% of CaO, 0.5 to 4% of SrO, and 0 to 0.5% of BaO. MgO+CaO+SrO+BaO is 18 to 22%, and MgO/CaO is 0.8 to 1.33.