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:
Feb. 06, 1990
Filed:
Jun. 03, 1988
Yoshinori Suto, Kamisumachi, JP;
Toshiyuki Ito, Kamisumachi, JP;
Hideyuki Nakajima, Kamisumachi, JP;
Keiichiro Okamura, Kamisumachi, JP;
Shin-ichi Nayuki, Kamisumachi, JP;
Hiroyasu Ogawa, Shizuokaken, JP;
Harumitsu Enomoto, Shizuokaken, JP;
Petoca Ltd., Tokyo, JP;
Abstract
A method for producing mesophase pitch based carbon fibers which enables to produce high strength high modulus carbon fibers at a relatively low temperature with stabilized production manner. This method comprises carbonizing infusibilized fibers, in an inert atmosphere under no tension state or a tension of 1 mg/denier or less in the first stage to give a specified interlayer spacing and a crystallite thickness and then carbonizing under a tension of 50-300 mg/denier at a temperature of 2600.degree. C. or more in the second stage.