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:
Jul. 01, 1997
Filed:
Jan. 17, 1995
Applicant:
Inventors:
Tetsuo Yamada, Kashima-gun, JP;
Tomiji Hosotsubo, Kashima-gun, JP;
Assignee:
Petoca, Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D01F / ;
U.S. Cl.
CPC ...
4234474 ; 4234476 ;
Abstract
A process for preparing mesophase pitch based carbon fibers is disclosed, wherein mesophase pitch fibers are gas-phase nitrated in an atmosphere of an oxygen-containing gas such as air or an inert gas such as nitrogen containing 0.1 to 50% by volume of NO.sub.2 at a low temperature of not higher than 100.degree. C. for a long period of time. The carbon fibers thus obtained are excellent in both mechanical strength and elastic modulus and have well-balanced physical properties.