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:
Mar. 12, 2013
Filed:
Nov. 08, 2010
Naomi Matsumoto, Shinjuku-ku, JP;
Kinobu Osakabe, Shinjuku-ku, JP;
Yoichi Hachitani, Shinjuku-ku, JP;
Naomi Matsumoto, Shinjuku-ku, JP;
Kinobu Osakabe, Shinjuku-ku, JP;
Yoichi Hachitani, Shinjuku-ku, JP;
Hoya Corporation, Tokyo, JP;
Abstract
The present invention relates to recording glass substrates molar percentages: 56-75 SiO, 1-11 AlO, more than 0-4 LiO, 1-15 NaO. more than 0 less than 3 KO, no BaO. total LiO, NaO and KO 6-15, (LiO NaO) less than 0.50, {KO/(LiO, NaO and KO)} equal or less than 0.13, total MgO, CaO and SrO 10-30, MgO and CaO 10-30, {(MgO+CaO)/(MgO+CaO+SrO)} equal or more than 0.86, alkali oxides to alkaline earth oxides equal to or more than 0.50. total ZrO, TiO, YO, LaO, GdO, NbO, and TaOmore than 0 equal to or less than 10, molar ratio {(ZrO, TiO, YO, LaO, GdO, NbO, and TaO)/AlOequal or more than 0.40, Tg equal to or higher than 600° C., average coefficient linear expansion equal or higher than 70×10/°C. at 100-300° C. and Young's modulus equal to or higher than 80 GPa.