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:
Apr. 14, 2026
Filed:
Mar. 30, 2022
Nippon Steel Chemical & Material Co., Ltd., Tokyo, JP;
Ryutaro Numao, Tokyo, JP;
Yasuhiro Aoyama, Tokyo, JP;
Masanori Ae, Tokyo, JP;
Mutsuhito Tanaka, Tokyo, JP;
Katsumasa Yagi, Tokyo, JP;
NIPPON STEEL CHEMICAL & MATERIAL CO., LTD., Tokyo, JP;
Abstract
A spherical alumina particle mixture able to improve a thermal conductivity and keep down a viscosity of a resin composition formed when kneading the mixture with a resin and a method for producing the same, that is, a spherical alumina particle mixture wherein in a particle size distribution measured by a wet sieving test method, 180 μm or more particles account for 0.04 wt % or less, an an α-alumina crystal content rate is 45% or more, a specific surface area is 0.3 to 1.0 m/g, and a roundness is 0.85 or more, and a method for producing the same.