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:
Dec. 20, 2022
Filed:
Mar. 23, 2020
Tdk Corporation, Tokyo, JP;
Yoshitaka Murakawa, Tokyo, JP;
Shogo Muroya, Tokyo, JP;
Hiroyuki Morita, Tokyo, JP;
Masanori Ikeda, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A ferrite sintered magnetcomprises M-type ferrite crystal grainshaving a hexagonal structure, two-crystal grain boundariesformed between two of the M-type ferrite crystal grains, and multiple-crystal grain boundariessurrounded by three or more of the M-type ferrite crystal grains. This ferrite sintered magnetcontains at least Fe, Ca, B, and Si, and contains B in an amount of 0.005 to 0.9 mass % in terms of BO, the two-crystal grain boundariesand the multiple-crystal grain boundariescontain Si and Ca, and in a cross-section parallel to a c-axis of the ferrite sintered magnet, when the number of multiple-crystal grain boundarieshaving a maximum length of 0.49 to 5 μm per cross-sectional area of 76 μmis N, N is 7 or less.