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. 07, 2022
Filed:
Dec. 14, 2016
Applicant:
Sony Corporation, Tokyo, JP;
Inventors:
Eiji Nakashio, Miyagi, JP;
Masaru Terakawa, Miyagi, JP;
Yoichi Kanemaki, Miyagi, JP;
Tomoe Sato, Miyagi, JP;
Katsunori Maeshima, Miyagi, JP;
Nobuyuki Sasaki, Miyagi, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/65 (2006.01); G11B 5/706 (2006.01); G11B 5/714 (2006.01);
U.S. Cl.
CPC ...
G11B 5/653 (2013.01); G11B 5/656 (2013.01); G11B 5/706 (2013.01); G11B 5/714 (2013.01);
Abstract
The magnetic recording medium includes a long substrate body, and a magnetic layer including a powder of cubic crystal ferrite magnetic particles. The sum of a squareness ratio in the longitudinal direction and a squareness ratio in the vertical direction is 1.2 or more, and the difference of the squareness ratio in the longitudinal direction and the squareness ratio in the vertical direction is 0.15 or more.