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:
Aug. 19, 1980
Filed:
Aug. 14, 1978
Applicant:
Inventors:
Isao Oda, Nagoya, JP;
Masayuki Kaneno, Tokoname, JP;
Assignee:
NGK Insulators, Ltd., Nagoya, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C04B / ;
U.S. Cl.
CPC ...
106 735 ;
Abstract
A sintered silicon nitride body consists of not more than 10% by weight in total of at least two metal oxides selected from the group consisting of beryllium oxide, magnesium oxide and strontium oxide (provided that each of the metal oxides is not more than 5% by weight) and the remainder of silicon nitride and may further contain not more than 10% by weight of at least one rare earth metal oxide, and is produced by preparing a mixture having the said composition range and then molding and sintering it at 1,600.degree.-1,900.degree. C. in nitrogen or inert gas atmosphere.