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:
Mar. 23, 1982
Filed:
Aug. 21, 1980
Applicant:
Inventors:
Assignee:
Toho Beslon Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B / ; D01F / ;
U.S. Cl.
CPC ...
219 / ; 219 / ; 219 1067 ; 13 27 ; 13 35 ; 4234471 ; 423448 ;
Abstract
A vertical heating apparatus for production of graphite fibers from preoxidized fibers or carbon fibers comprises of a tubular heating element which generates heat by high frequency induction. A heat-insulating material layer surrounds the tubular heating element coaxially. The layer is composed of carbon particles having specific grain diameters and angles of repose. A high frequency induction unit is provided around the heat-insulating material layer also in a coaxial relation thereof.