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. 13, 1993
Filed:
Aug. 31, 1990
Hideo Saruyama, Ehime, JP;
Akira Okuda, Iyo, JP;
Toray Industries, Inc., Tokyo, JP;
Abstract
A noncircular cross-section carbon fiber wherein the cross-section is a noncircular one having at least one plane of symmetry passing the centroid and having an angle of rotational symmetry, .theta., defined by .theta.=360.degree./n, in which n is an integer of 1 to 10; wherein the internal structure has no lamellar structure and the fiber has a substantially uniform crystalline structure; and wherein the fiber surface has a surface smoothness S of 1.16 or below and the tensile strength and the tensile modulus of the fiber in the form of a resin-impregnated strand is 300 kg/mm.sup.2 or above and 20 ton/mm.sup.2 or above, respectively; a process for producing such carbon fiber; and a composite of such carbon fiber with a resin.