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:
Jun. 04, 2024
Filed:
Dec. 23, 2022
Applicant:
Coorstek Kk, Tokyo, JP;
Inventors:
Takuya Nakagawa, Kariya, JP;
Yuji Fukasawa, Kariya, JP;
Assignee:
COORSTEK GK, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B22F 3/16 (2006.01); B22F 1/10 (2022.01);
U.S. Cl.
CPC ...
B22F 3/16 (2013.01); B22F 1/10 (2022.01); B22F 2201/00 (2013.01); B22F 2207/01 (2013.01); B22F 2301/052 (2013.01);
Abstract
An alumina sintered body having a low dielectric loss tangent and a method for manufacturing the alumina sintered body are provided. An alumina sintered body contains AlO99.50 mass % or more, and 99.95 mass % or less and sodium and silicon, wherein at a surface layer A in any given cross-section and a central portion B of the cross-section in a depth direction from the surface layer A, a concentration ratio of sodium to silicon in the surface layer A is smaller than the concentration ratio of sodium to silicon at the central portion B.