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:
Jan. 05, 1988
Filed:
Oct. 24, 1986
Applicant:
Inventor:
Dale E Wittmer, Carbondale, IL (US);
Assignee:
GTE Products Corporation, Stamford, CT (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C04B / ; C01B / ;
U.S. Cl.
CPC ...
501 97 ; 501 92 ; 501 95 ; 501 96 ; 423344 ;
Abstract
A process is disclosed for producing beta silicon nitride fibers. The process involves heating a green article of a silicon nitride based material in a furnace at a temperature of from about 1700.degree. C. to about 2000.degree. C. at a pressure of nitrogen gas of at least about 100 psig for a sufficient time to form silicon nitride fibers, the major portion of which are beta silicon nitride fibers. The heating step is carried out with the article covered with a cover made of silicon carbide or silicon nitride. Alternately, the article can be in a container of silicon nitride or silicon carbide and covered with the cover.