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. 22, 2013
Filed:
Mar. 03, 2010
Tatsuo Nagashima, Chiyoda-ku, JP;
Kensuke Nagai, Chiyoda-ku, JP;
Tetsuya Nakashima, Chiyoda-ku, JP;
Kei Maeda, Chiyoda-ku, JP;
Tatsuo Nagashima, Chiyoda-ku, JP;
Kensuke Nagai, Chiyoda-ku, JP;
Tetsuya Nakashima, Chiyoda-ku, JP;
Kei Maeda, Chiyoda-ku, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
To provide glass for a data storage medium substrate, whereby high heat resistance can be obtained. Glass for a data storage medium substrate, which comprises, as represented by mol percentage based on the following oxides, from 55 to 70% of SiO, from 2.5 to 9% of AlO, from 0 to 10% of MgO, from 0 to 7% of CaO, from 0.5 to 10% of SrO, from 0 to 12.5% of BaO, from 0 to 2.5% of TiO, from 0.5 to 3.7% of ZrO, from 0 to 2.5% of LiO, from 0 to 8% of NaO, from 2 to 8% of KO and from 0.5 to 5% of LaO, provided that the total content of AlOand ZrO(AlO+ZrO) is at most 12%, and the total content of LiO, NaO and KO (RO) is at most 12%.