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. 03, 2013
Filed:
Aug. 04, 2006
Applicants:
Yukihiro Kanechika, Shunan, JP;
Masanobu Azuma, Shunan, JP;
Inventors:
Yukihiro Kanechika, Shunan, JP;
Masanobu Azuma, Shunan, JP;
Assignee:
Tokuyama Corporation, Shunan-shi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B 1/00 (2006.01); B32B 1/02 (2006.01); B32B 1/08 (2006.01); C04B 35/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
Provided is an aluminum nitride sintered body with high optical transmissivity and which has a smooth surface in the unpolished condition after firing. The aluminum nitride sintered body has an oxygen concentration of 450 ppm or less, a concentration of impurity elements excluding oxygen, nitrogen, and aluminum of 350 ppm or less, and an average crystal grain diameter of between 2 μm and 20 μm, and also has an arithmetic mean surface height Ra of 1 μm or less and a maximum height Rz of 10 μm or less in the unpolished condition after firing.