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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.:

US 10204651 B1

PDFFull Text
Date of Patent:
Feb. 12, 2019

Filed:

Apr. 10, 2015

Magnetic recording medium having cubic ferrite or e-phase iron oxide magnetic particles

Applicant:

Sony Corporation, Tokyo, JP;

Inventors:

Eiji Nakashio, Miyagi, JP;

Minoru Yamaga, Miyagi, JP;

Masaru Terakawa, Miyagi, JP;

Yoichi Kanemaki, Miyagi, JP;

Katsunori Maeshima, Miyagi, JP;

Jun Hashimoto, Miyagi, JP;

Assignee:

Sony Corporation, Tokyo, JP;

Attorney:

K & L Gates LLP

Primary Examiner:

Kevin M Bernatz

Int. Cl.
CPC ...
G11B 5/706 (2006.01); G11B 5/714 (2006.01); G11B 5/78 (2006.01); G11B 5/70 (2006.01);
U.S. Cl.
CPC ...
G11B 5/70642 (2013.01); G11B 5/70 (2013.01); G11B 5/70621 (2013.01); G11B 5/70678 (2013.01); G11B 5/714 (2013.01); G11B 5/78 (2013.01);
Abstract

The magnetic recording medium includes a support and a magnetic layer containing a magnetic powder. The magnetic powder includes at least either of a magnetic particle containing a cubic ferrite and a magnetic particle containing an ε-phase iron oxide. The magnetic powder has a mean particle size of 10 nm or more and 14 nm or less, the magnetic powder has a mean aspect ratio of 0.75 or more and 1.25 or less, and the magnetic layer has a ten-point mean roughness Rz of 35 nm or less.

Find Patent Forward Citations

Nakashio, Eiji. (2019). Magnetic recording medium having cubic ferrite or e-phase iron oxide magnetic particles (U.S. Patent No. 10204651). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/10204651

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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