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:
Jun. 26, 2001
Filed:
Apr. 19, 1999
Akihiro Koyama, Osaka, JP;
Shoichi Kishimoto, Osaka, JP;
Junji Kurachi, Osaka, JP;
Nobuyuki Yamamoto, Osaka, JP;
Nippon Sheet Glass Co., Ltd., Osaka, JP;
Abstract
A glass composition is disclosed which has a high modulus of elasticity (Young's modulus) and a high rigidity (modulus of elasticity/specific gravity) and is capable of being effectively inhibited from bending or vibrating. Also disclosed is a substrate for information recording media, which comprises the glass composition. The glass composition comprises the following components in terms of mol %: 50 to 64% SiO,, 6 to 18% Al,O,, 7 to 15% Li,O, 3 to 12% Na,O, 0 to 2% K,O, 0 to 10% TiO,, 0 to 4% ZrO,, 0 to 6% MgO, 0 to 9% CaO, and 0 to 6% SrO, provided at the content of RO (RO=MgO+CaO+SrO) is from 2 to 15%.