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. 08, 2021
Filed:
Dec. 30, 2019
Applicant:
Agc Inc., Chiyoda-ku, JP;
Inventors:
Akio Koike, Tokyo, JP;
Makoto Katsuta, Tokyo, JP;
Suguru Murayama, Tokyo, JP;
Kenji Imakita, Tokyo, JP;
Assignee:
AGC Inc., Chiyoda-ku, JP;
Primary Examiner:
Int. Cl.
CPC ...
C03C 3/083 (2006.01); B32B 5/16 (2006.01); C03C 21/00 (2006.01); C03C 3/062 (2006.01); C03C 3/085 (2006.01); C03C 3/087 (2006.01); F16C 33/32 (2006.01);
U.S. Cl.
CPC ...
C03C 21/002 (2013.01); C03C 3/062 (2013.01); C03C 3/083 (2013.01); C03C 3/085 (2013.01); C03C 3/087 (2013.01); F16C 33/32 (2013.01); C01P 2004/32 (2013.01); C01P 2006/10 (2013.01); C01P 2006/32 (2013.01);
Abstract
A glass ball has a density of 2.3 to 3.2 g/cm, a Young's modulus of 60 to 150 GPa, and an average coefficient of thermal expansion at 50 to 350° C. being 40×10to 120×10/° C. The glass ball is formed of a glass material including, as represented by mole percentage based on oxides, 30 to 75 mol % of SiO, 2 to 30 mol % of AlO, and 5 to 25 mol % of RO, where R is at least one kind selected from Li, Na and K. The glass ball includes a compressive stress layer in a surface thereof.