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. 01, 1999
Filed:
Sep. 02, 1997
Applicant:
Inventors:
Assignee:
NGK Insulators, Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B / ;
U.S. Cl.
CPC ...
501 984 ; 501 96 ; 156345 ; 1187 / ; 118725 ; 20429801 ; 20429831 ; 219553 ;
Abstract
An aluminum nitride sintered body is characterized by having a g-value of an unpaired electron in a spectrum of an electron spin resonance being not less than 2.0010. The aluminum nitride sintered body is produced by sintering a raw material composed of powdery aluminum nitride at a temperature of not less than 1730.degree. C. to not more than 1920.degree. under a pressure of not less than 80 kg/cm.sup.2.