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. 26, 2014
Filed:
Dec. 24, 2009
Applicants:
Kazuaki Hashimoto, Tokyo, JP;
Yoshikazu Hirose, Tokyo, JP;
Inventors:
Kazuaki Hashimoto, Tokyo, JP;
Yoshikazu Hirose, Tokyo, JP;
Assignee:
HOYA Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C 15/00 (2006.01); C03C 21/00 (2006.01);
U.S. Cl.
CPC ...
C03C 21/002 (2013.01); C03C 15/00 (2013.01);
Abstract
A glass substrate chemically strengthened, includes a primary surface that has a compressive stress layer formed in an uppermost surface layer thereof. The compressive stress layer is configured to enhance strength of the glass substrate due to a compressive stress generated in the compressive stress layer. The compressive layer consists of a layer of a potassium ion concentration equal to or less than 5000 parts per million (ppm).