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:
Mar. 04, 2008
Filed:
Mar. 15, 2005
Applicant:
Akiyoshi Hattori, Handa, JP;
Inventor:
Akiyoshi Hattori, Handa, JP;
Assignee:
NGK Insulators, Ltd., Nagoya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C04B 35/581 (2006.01);
U.S. Cl.
CPC ...
Abstract
An aluminum nitride substrate comprises a planar sintered aluminum nitride body containing carbon including free carbon and a substantially planar electrode buried in the sintered aluminum nitride body. The sintered aluminum nitride body includes a work mounting portion for placing a work thereon and a base layer having the electrode buried therein. The average concentration of free carbon in the work mounting portion different from the average concentration of free carbon in the base layer.