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:
Jul. 05, 2022
Filed:
Jun. 07, 2018
Applicant:
Hitachi Metals, Ltd., Tokyo, JP;
Inventors:
Assignee:
HITACHI METALS, LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01Q 7/08 (2006.01); H01F 1/34 (2006.01); C04B 35/26 (2006.01); H01F 3/08 (2006.01); H01F 5/06 (2006.01);
U.S. Cl.
CPC ...
H01Q 7/08 (2013.01); C04B 35/265 (2013.01); H01F 1/344 (2013.01); H01F 3/08 (2013.01); H01F 5/06 (2013.01); C04B 2235/3274 (2013.01); C04B 2235/3279 (2013.01); C04B 2235/3281 (2013.01); C04B 2235/3284 (2013.01); C04B 2235/786 (2013.01);
Abstract
A coil device comprising a coil, and a ferrite core arranged in a hollow portion of the coil, and a resin covering them; the ferrite core being a Ni ferrite core having initial permeability μi of 450 or more at a frequency of 100 kHz and a temperature of 20° C., and an average crystal grain size of 5-9 μm, both of temperature-dependent inductance change ratios TLa and TLb and stress-dependent inductance change ratios PLa and PLb being −0.6% to +0.6%, and both of the sum of TLa and PLa and the sum of TLb and PLb being more than −1.0% and less than +1.0%; and an antenna comprising it.