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. 17, 1977
Filed:
Oct. 30, 1975
Applicant:
Inventors:
Soichiro Kishimoto, Okayama, JA;
Saburo Okazaki, Okayama, JA;
Assignee:
Japan Exlan Company Limited, Osaka, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
4234474 ; 4234476 ; 4234477 ; 264 292 ;
Abstract
A process for producing a carbon fiber having high tensile strength and high modulus of elasticity which comprises heat-treating an acrylonitrile fiber impregnated with at least one compound selected from specific primary amines and/or quaternary ammonium salts so that an acrylic fiber which is partly insoluble in a concentrated aqueous solution of sodium thiocyanate is obtained; thermally stabilizing said partly insoluble acrylic fiber; and then carbonizing said thermally stabilized fiber.