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. 04, 2015
Filed:
Jun. 29, 2012
Akihiro Koyama, Hyogo, JP;
Satoshi Ami, Mie, JP;
Manabu Ichikawa, Mie, JP;
AvanStrate Inc., Yokkaichi-shi, JP;
Abstract
A flat panel display glass substrate includes a glass comprising, in mol %, 55-80% SiO, 3-20% AlO, 3-15% BO, and 3-25% RO (the total amount of MgO, CaO, SrO, and BaO). The contents in mol % of SiO, AlO, and BOsatisfy a relationship (SiO+AlO)/(BO)=7.5-17. The strain point of the glass is 665° C. or more. The devitrification temperature of the glass is 1250° C. or less. The substrate has a heat shrinkage rate of 75 ppm or less. The rate of heat shrinkage is calculated from the amount of shrinkage of the substrate measured after a heat treatment which is performed at a rising and falling temperature rate of 10° C./min and at 550° C. for 2 hours by the rate of heat shrinkage (ppm)={the amount of shrinkage of the substrate after the heat treatment/the length of the substrate before the heat treatment}×10.