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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 11348711 B1

PDFFull Text
Date of Patent:
May. 31, 2022

Filed:

Sep. 17, 2018

Core-shell particle, fired product of core-shell particle, manufacturing method of core-shell particle, epsilon type iron oxide-based compound particle, manufacturing method of epsilon type iron oxide-based compound particle, magnetic recording medium, and manufacturing method of magnetic recording medium

Applicant:

Fujifilm Corporation, Tokyo, JP;

Inventors:

Kenji Naoi, Kanagawa, JP;

Masashi Shirata, Kanagawa, JP;

Takashi Fujimoto, Kanagawa, JP;

Assignee:

FUJIFILM Corporation, Tokyo, JP;

Attorney:

Sughrue Mion, PLLC

Primary Examiner:

C Melissa Koslow

Int. Cl.
CPC ...
H01F 1/11 (2006.01); C01G 49/06 (2006.01); C01G 49/08 (2006.01); C01G 49/00 (2006.01); C01G 49/02 (2006.01); G11B 5/712 (2006.01); G11B 5/706 (2006.01);
U.S. Cl.
CPC ...
H01F 1/11 (2013.01); C01G 49/0018 (2013.01); C01G 49/02 (2013.01); C01G 49/06 (2013.01); C01G 49/08 (2013.01); G11B 5/712 (2013.01); C01P 2002/32 (2013.01); C01P 2004/04 (2013.01); C01P 2004/64 (2013.01); C01P 2004/84 (2013.01); C01P 2006/42 (2013.01); G11B 5/70642 (2013.01);
Abstract

The invention provides a core-shell particle which can provide, by being calcinated, epsilon type iron oxide-based compound particles that have a small coefficient of variation of primary particle diameter and show excellent SNR and running durability when employed in a magnetic recording medium as well as applications thereof. The core-shell particle includes: a core including at least one iron oxide selected from FeOor FeO, or iron oxyhydroxide; and a shell that coats the core, the shell including a polycondensate of a metal alkoxide and a metal element other than iron, as well as applications thereof.

Find Patent Forward Citations

Naoi, Kenji. (2022). Core-shell particle, fired product of core-shell particle, manufacturing method of core-shell particle, epsilon type iron oxide-based compound particle, manufacturing method of epsilon type iron oxide-based compound particle, magnetic recording medium, and manufacturing method of magnetic recording medium (U.S. Patent No. 11348711). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/11348711

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

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