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:
Apr. 04, 1989
Filed:
Nov. 13, 1986
Applicant:
Inventors:
Assignee:
Tao Nenryo Kogyo K.K., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
D02G / ;
U.S. Cl.
CPC ...
428364 ; 423344 ; 428359 ; 501 95 ; 501 97 ; 264 65 ;
Abstract
Silicon nitride fibers having a carbon content of 5 weight percent or less have high heat insulating properties and favorable mechanical properties and are useful as heat resistant, highly insulating materials or reinforcing agents for composite materials, particularly in the aerospace industry. Such high purity silicon nitride fibers are produced by spinning a solution of perhydropolysilazanes, an inert solvent and a spinning agent into fibers, preferably continuous fibers, and firing the spun fibers at 800.degree. to 1300.degree. C. in an inert atmosphere to form silicon nitride fibers of high purity.