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, 2005
Filed:
Oct. 11, 2002
Kunio Nishimura, Yokohama, JP;
Morinobu Endo, Suzaka, JP;
Kunio Nishimura, Yokohama, JP;
Morinobu Endo, Suzaka, JP;
Showa Denko K.K., Tokyo, JP;
Abstract
Fine carbon fibers having a fiber diameter of 1 μm or less, an interlayer distance dbetween carbon layers as determined by an X-ray diffraction method of 0.335 to 0.342 nm or less and satisfying d<0.3448-0.0028 (log φ) where φ stands for the diameter of the carbon fibers, and a thickness Lc of the crystal in the C axis direction of 40 nm or less. Fine carbon fibers containing boron in crystals of the fiber. The fine carbon fibers can be produced by using vapor-grown fine carbon fibers as a raw material, adding a boron or a boron compound to the material; pressing the mixture to regulate the bulk density to preferably 0.05 g/cmor more; and heating at a temperature of 2000° C. or higher.