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. 09, 2015
Filed:
Sep. 06, 2010
Hiroshi Kajita, Osaka, JP;
Hideki Kawai, Kobe, JP;
Hiroshi Kajita, Osaka, JP;
Hideki Kawai, Kobe, JP;
Konica Minolta Opto, Inc., Tokyo, JP;
Abstract
Provided are a glass substrate for information recording media wherein air bubbles can be sufficiently removed, and an information recording medium using the glass substrate. The glass substrate contains 65 to 90 mass % of SiO+Al2O+BO(where SiOis 45 to 75 mass %, AlOis 1 to 20 mass %, and BOis 0 to 8 mass %), 7 to 20 mass % of R2O (where R represents Li, Na, or K), 0.1 to 12 mass % of R'O (where R′ represents Mg, Ca, Sr, Ba, or Zn), and 0.5 to 10 mass % of TiO+ZrO. Moreover, the glass substrate contains at least one multivalent element selected from among a group consisting of V, Mn, Ni, Mo, Sn, Ce, and Bi; the molar ratio of the total amount of the oxide of the multivalent element to the total amount of TiO+ZrOis within the range of 0.05 to 0.50.