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:
Jun. 20, 1995
Filed:
Sep. 07, 1993
Yutaka Arai, Kawasaki, JP;
Ken Kobayashi, Himeji, JP;
Kunio Miura, Himeji, JP;
Hiroyuki Tadokoro, Himeji, JP;
Yasuo Nagata, Himeji, JP;
Kazuhiko Mizuuchi, Himeji, JP;
Nippon Steel Corporation, Tokyo, JP;
Nippon Steel Chemical Co., Ltd., Tokyo, JP;
Abstract
A bundle of pitch-based carbon fibers which is composed of 1000 to 100,000 continuous fiber filaments having an average diameter of 4 to 8 .mu.m, a filament tensile strength of at least 3.0 GPa, and a modulus of at least 600 GPa, and also a method for producing a fine diameter pitch-based carbon fiber wherein use is made of a spinning nozzle with a single nozzle plate which has at least 1000 capillary holes, has the capillaries arranged concentrically and circularly in 3 to 20 rows, has the capillaries positioned to be divided into at least two blocks, has a columnar projection protruding at least 20 mm from the surface of the nozzle plate at the center of the nozzle plate, and has capillaries of a diameter of 50 to 110 .mu.m.