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:
Nov. 12, 1985
Filed:
Dec. 22, 1983
Toray Industries, Inc., Tokyo, JP;
Abstract
A process for producing carbon fiber is disclosed, which comprises a preoxidation step for heating precursor fibers in an oxidizing atmosphere and converting them into partially oxidized fibers, an oxidizing step for heating the partially oxidized fibers in an oxidizing atmosphere and converting them into oxidized fibers, and a carbonization step for heating the oxidized fibers in an inert atmosphere and converting them into carbonized fibers, in which in the preoxidation step the precursor fibers are heated at a temperature of about 200.degree. to 250.degree. C. and in which a portion or the whole of the exhaust gas from the oxidation step is supplied into the preoxidation step as the oxidation atmosphere gas and the exhaust gas from the preoxidation step is subjected to a burning treatment.