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. 19, 1989
Filed:
Jun. 09, 1988
Applicant:
Inventors:
Assignee:
Mitsubishi Rayon Co., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C25 / ;
U.S. Cl.
CPC ...
204130 ; 20415715 ; 20415742 ; 4234471 ; 4234472 ;
Abstract
A method for after-treatment of carbon fiber, which comprises by electrolytic oxidation treatment in an aqueous solution having an ammonium ion concentration of 0.2 to 4.0 mol/l and a pH of at least 7 using the carbon fiber as an anode, followed by treating the resulting fiber in water with an ultrasonic wave of at least 20 kHz frequency at an intensity satisfying the condition: ##EQU1## wherein, F is the frequency (kHz) and T is the treatment period (min) provided that T>0.1.