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:
Apr. 27, 1993
Filed:
Jul. 02, 1991
Isao Mochida, Fukuoka, JP;
Ryuji Fujiura, Niigata, JP;
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Abstract
A process for making carbon fiber reinforced materials which not only have desirable qualities which include high strength, high heat resistance, chemical resistance, wear resistance and lightweightness but also which are produced in a short time and at low cost. The process includes the steps of impregnating a carbon fiber assembly with a melt of mesophase pitch or mixing short carbon fibers with the mesophase pitch, shaping the pitch-impregnated assembly or the pitch/short carbon fiber mixture, and firing the same. The process requires that the mesophase pitch used in the process be almost 100% of an optical anistropic phase as examined under a polarizing microscope; have a softening point of no higher than 350.degree. C. and be capable of being carbonized in a yield of at least 70% when gradually heated to a temperature of about 600.degree. C. in an inert gas atmosphere and then held at that temperature for two hours.