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:
Sep. 01, 2026
Filed:
Mar. 04, 2022
Applicant:
Hoya Corporation, Tokyo, JP;
Inventors:
Shuzo Tokumitsu, Tokyo, JP;
Kazuaki Hashimoto, Tokyo, JP;
Assignee:
HOYA CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C 3/085 (2006.01); C03C 3/091 (2006.01); C03C 3/095 (2006.01); G11B 5/73 (2006.01);
U.S. Cl.
CPC ...
C03C 3/085 (2013.01); C03C 3/091 (2013.01); C03C 3/095 (2013.01); G11B 5/73921 (2019.05);
Abstract
Provided is a glass for a magnetic recording medium substrate or for a glass spacer for a magnetic recording/reproducing device, the glass being an amorphous glass that contains at least LiO, in which a total content of NaO and KO is 0 mol % or more and 6.0 mol % or less, a BOcontent is 0 mol % or more and 10.0 mol % or less, and a CaO content is 0 mol % or more and 1.0 mol % or less.