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:
Apr. 30, 2013
Filed:
Jan. 03, 2012
Kensuke Nagai, Tokyo, JP;
Yuichi Kuroki, Tokyo, JP;
Manabu Nishizawa, Tokyo, JP;
Tomoyuki Tsujimura, Tokyo, JP;
Kensuke Nagai, Tokyo, JP;
Yuichi Kuroki, Tokyo, JP;
Manabu Nishizawa, Tokyo, JP;
Tomoyuki Tsujimura, Tokyo, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
The present invention provides an alkali-free glass having a high strain point, a low viscosity and low devitrification, which is easily subjected to float molding and fusion molding. The glass herein has a strain point of 725° C. or higher, an average thermal expansion coefficient at 50 to 300° C. of 30×10to 40×10/° C., a temperature Tat which a glass viscosity becomes 10dPa·s of 1,710° C. or lower, a temperature Tat which a glass viscosity becomes 10dPa·s of 1,330° C. or lower, a glass surface devitrification temperature (T) of 1,330° C. or lower, and a glass internal devitrification temperature (T) of 1,330° C. or lower.