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:
Sep. 20, 1994
Filed:
Jun. 17, 1992
Applicant:
Inventors:
Yoji Matsuhisa, Iyo, JP;
Toru Hiramatsu, Matsuyama, JP;
Kazuo Yoshida, Akigawa, JP;
Gen Katagiri, Otsu, JP;
Assignees:
Toray Industries, Inc., , JP;
Toray Research Center, Inc., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ; D02G / ;
U.S. Cl.
CPC ...
428367 ; 428364 ; 428372 ; 428379 ; 428400 ; 4234472 ; 4234474 ;
Abstract
Disclosed is a carbon fiber made from an acrylic fiber, the carbon crystal of which has a crystal size Lc of 15 to 65 .ANG. as determined by the wide angle X-ray diffractometry. This carbon fiber has regions with a lower crystallinity in the surface layer portion thereof than that of the central portion thereof, and the compressive strength .sigma..sub.cf (GPa) of the single filament thereof determined by the loop method satisfies formula (I):