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:
Feb. 09, 2021
Filed:
Jan. 16, 2019
Applicant:
Showa Denko K.k., Tokyo, JP;
Inventors:
Takenori Hashimoto, Oyama, JP;
Wataru Sato, Ichihara, JP;
Assignee:
SHOWA DENKO K.K., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/848 (2006.01); C22C 21/02 (2006.01); B22F 7/06 (2006.01); G11B 5/73 (2006.01); G11B 5/706 (2006.01); G11B 5/84 (2006.01); C22C 1/04 (2006.01); H01F 1/00 (2006.01); B22F 3/20 (2006.01); B22F 1/00 (2006.01); B22F 9/08 (2006.01);
U.S. Cl.
CPC ...
G11B 5/70621 (2013.01); B22F 7/062 (2013.01); C22C 1/0416 (2013.01); C22C 21/02 (2013.01); G11B 5/73919 (2019.05); G11B 5/8404 (2013.01); G11B 5/848 (2013.01); H01F 1/00 (2013.01); B22F 1/0011 (2013.01); B22F 3/20 (2013.01); B22F 9/082 (2013.01); B22F 2301/052 (2013.01); B22F 2304/10 (2013.01); B22F 2998/10 (2013.01);
Abstract
This substrate for a magnetic recording medium has a metal structure made of an Al alloy having a composition including Si in a range of 28.0% by mass to 32.0% by mass, Cu in a range of 2.5% by mass to 4.0% by mass, and Mg in a range of 0.8% by mass to 1.5% by mass with a remainder being Al, primary-crystal Si particles having a maximum diameter of 0.5 μm or more and an average particle diameter of 2 μm or less are dispersed in the metallic structure, a diameter of the substrate is in a range of 53 mm to 97 mm, and a thickness of the substrate is in a range of 0.2 mm to 0.9 mm.