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:
Feb. 20, 1990
Filed:
Jun. 06, 1988
Applicant:
Inventors:
Michiyasu Komatsu, Yokohama, JP;
Hiroyasu Ohta, Yokohama, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kanagawa, JP;
Primary Examiner:
Int. Cl.
CPC ...
C04B / ; C04B / ;
U.S. Cl.
CPC ...
501 97 ; 501 98 ;
Abstract
A sintered silicon nitride ceramic article excelling in high-temperature strength and experiencing only an insignificant decline of strength at elevated temperatures particularly up to 1,300.degree. C. is produced by firing a ceramic mixture composed of not more than 10% by weight of the oxide of a rare earth element, not more than 10% by weight of at least one member selected from the group consisting of oxides, carbides, and silicides respectively of Hf, Ta, and Nb, optionally not more than 10% by weight of aluminum nitride, and the balance being silicon nitride.