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. 05, 1983
Filed:
Apr. 09, 1982
Seiichi Uemura, Tokyo, JP;
Shunichi Yamamoto, Kamakura, JP;
Takao Hirose, Kamakura, JP;
Hiroaki Takashima, Kawasaki, JP;
Osamu Kato, Yokohama; all of, JP;
Nippon Oil Co., Ltd., Tokyo, JP;
Abstract
A starting pitch for carbon fibers, produced by heat treating at 400.degree.-500.degree. C. under a hydrogen pressure of at least 20 Kg/cm.sup.2.G (1) a heavy fraction oil boiling at not lower than 200.degree. C. obtained at the time of fluidized catalytic cracking of petroleum or (3) a mixture of the heavy fraction oil (1) with (2) a heavy fraction oil boiling at not lower than 200.degree. C. obtained at the time of steam cracking of petroleum, the pitch so produced being heat treated to make precursor pitch therein, melt spun, infusibilized and carbonized or further graphitized to obtain the carbon fibers.