Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Kazuaki Hashimoto0
Tetsuo Takano0
Satoshi Ami0
Akihiro Koyama0
Mikiko Morishita0
Date of Patent
September 6, 2016
0Patent Application Number
132476270
Date Filed
September 28, 2011
0Patent Citations Received
Patent Primary Examiner
Patent abstract
The disclosed cover glass is produced by etching a glass substrate that has been formed by a down-drawing process, and chemically strengthening the glass substrate to provide the glass substrate with a compressive-stress layer on the principal surfaces thereof. The glass substrate contains, as components thereof, 50% to 70% by mass of SiO2, 5% to 20% by mass of Al2O3, 6% to 30% by mass of Na2O, and 0% to less than 8% by mass of Li2O. The glass substrate may also contain 0% to 2.6% by mass of CaO, if necessary. The glass substrate has an etching characteristic in which the etching rate is at least 3.7 μm/minute in an etching environment having a temperature of 22° C. and containing hydrogen fluoride with a concentration of 10% by mass.
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