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:
Apr. 28, 2015
Filed:
Mar. 18, 2009
Applicants:
Yoichi Hachitani, Shinjuku-ku, JP;
Kinobu Osakabe, Shinjuku-ku, JP;
Inventors:
Yoichi Hachitani, Shinjuku-ku, JP;
Kinobu Osakabe, Shinjuku-ku, JP;
Assignee:
Hoya Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/735 (2006.01); C03B 11/00 (2006.01); C03B 19/00 (2006.01); G11B 5/84 (2006.01); C03C 3/083 (2006.01); C03C 3/085 (2006.01); C03C 3/087 (2006.01); C03C 3/095 (2006.01); C03C 3/097 (2006.01); G11B 5/73 (2006.01);
U.S. Cl.
CPC ...
G11B 5/8404 (2013.01); C03C 3/083 (2013.01); C03C 3/085 (2013.01); C03C 3/087 (2013.01); C03C 3/095 (2013.01); C03C 3/097 (2013.01); G11B 5/7315 (2013.01);
Abstract
A glass for a magnetic recording medium substrate permitting the realization of a magnetic recording medium substrate affording good chemical durability and having an extremely flat surface, a magnetic recording medium substrate comprised of this glass, a magnetic recording medium equipped with this substrate, and methods of manufacturing the same. The glass is an oxide glass not including As or F.