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:
May. 14, 1985
Filed:
Jul. 26, 1983
Applicant:
Inventors:
Assignee:
UBE Industries, Ltd., Yamaguchi, JP;
Primary Examiner:
Int. Cl.
CPC ...
C01B / ; C04B / ;
U.S. Cl.
CPC ...
423344 ; 501 97 ;
Abstract
Crystalline silicon nitride powder in the form of granular particles having a large tap density and having good filling characteristics is produced by heating amorphous silicon nitride powder under an inert or reducing gas atmosphere. The amorphous silicon nitride powder is ground prior to the heating and the powder to be heated is maintained at a temperature of 1250.degree. C. to 1430.degree. C. for at least one hour in the course of temperature rise.