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:
Oct. 11, 2005
Filed:
Jul. 30, 2003
Shigeru Tanaka, Hitachi, JP;
Akio Chiba, Hitachi, JP;
Yasutaka Suzuki, Taga, JP;
Kazuhiro Hirose, Hitachinaka, JP;
Tamihito Kawahigashi, Hitachinaka, JP;
Shigeru Tanaka, Hitachi, JP;
Akio Chiba, Hitachi, JP;
Yasutaka Suzuki, Taga, JP;
Kazuhiro Hirose, Hitachinaka, JP;
Tamihito Kawahigashi, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An aluminum nitride sintered body produced by sintering under pressure of a powder composition comprising aluminum nitride and 5 to 30% by weight of at least one sintering aid selected from the group consisting of Nd, Sm, Eu, Er, Dy, Gd, Pr and Yb, per 100% by weight of the powders of aluminum nitride and the sintering aid, wherein the amount of the sintering aid is a conversion value as oxides of the elements, the sintering body that has been subjected to mirror-polishing having a surface roughness R max of 0.2 μm or less and a thermal conductivity of 200 (W/mK) or more.