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. 20, 2022
Filed:
Aug. 06, 2020
Applicant:
Fujifilm Corporation, Tokyo, JP;
Inventors:
Kenji Naoi, Minami-ashigara, JP;
Koichi Yagishita, Minami-ashigara, JP;
Assignee:
FUJIFILM Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B 5/706 (2006.01); G11B 5/714 (2006.01); G11B 5/008 (2006.01); G11B 5/708 (2006.01); G11B 5/735 (2006.01);
U.S. Cl.
CPC ...
G11B 5/70678 (2013.01); G11B 5/00813 (2013.01); G11B 5/7085 (2013.01); G11B 5/714 (2013.01); G11B 5/735 (2013.01);
Abstract
The magnetic recording medium includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder, in which the ferromagnetic powder is an ε-iron oxide powder having an average particle size of 9.0 nm to 20.0 nm, and in the ε-iron oxide powder, a content of particles having a particle size smaller than 8.0 nm is less than 20.0% by mass, a content of particles having a particle size smaller than 6.0 nm is less than 5.0% by mass, and a content of particles having a particle size greater than 25.0 nm is less than 20.0% by mass.