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. 11, 1990
Filed:
Aug. 16, 1989
Applicant:
Inventor:
Minoru Matsui, Nagoya, JP;
Assignee:
NGK Insulators, Ltd., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C04B / ;
U.S. Cl.
CPC ...
501 97 ; 501 98 ; 264 65 ; 264 66 ;
Abstract
A high density silicon nitride sintered body having a substantially crystallized intergranular phase and an improved mechanical strength at high temperature is produced by firing a molded body of a blend comprising Si.sub.3 N.sub.4, a sintering aid and a crystallization controlling agent selected from at least one compound of Cr, Mn, Co, Ni, Nb and Mo with a specified blending ratio.