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:
Oct. 09, 2012
Filed:
Dec. 15, 2006
Applicants:
Yoshinari Kato, Otsu, JP;
Tatsuya Takaya, Otsu, JP;
Inventors:
Yoshinari Kato, Otsu, JP;
Tatsuya Takaya, Otsu, JP;
Assignee:
Nippon Electric Glass Co., Ltd., Otsu-shi, Shiga, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03B 17/00 (2006.01); C03B 17/06 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention provides an alkali-free glass substrate small in the variation of the thermal shrinkage and a process for producing the same. An alkali-free glass substrate of the invention has an absolute value of a thermal shrinkage of 50 ppm or more when the alkali-free glass substrate is heated at a rate of 10° C./min from a room temperature, kept at a holding temperature of 450° C. for 10 hr and then cooled at a rate of 10° C./min.