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:
Oct. 17, 1989
Filed:
Jan. 31, 1989
Applicant:
Inventors:
Ataru Wakabayashi, Yokohama, JP;
Yohichi Umehara, Yokohama, JP;
Satsuki Morie, Kawasaki, JP;
Ikuro Kuwahara, Kawasaki, JP;
Yoshimi Okada, Yokohama, JP;
Assignee:
Chiyoda Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01M / ; C25B / ; C25C / ;
U.S. Cl.
CPC ...
204 94 ; 204112 ; 204113 ; 204130 ; 423 94 ; 423493 ; 429107 ; 429109 ;
Abstract
A redox battery electrolyte is prepared from a chromium and/or iron base raw material containing nickel as impurities by dissolving the raw material in a hydrochloric acid-containing aqueous liquid to form a solution containing chromium ions and/or iron ions and nickel ions, the resulting solution being subjected to a cathodic reduction in the presence of lead ions until the electric potential thereof becomes lower than -0.6 V vs. saturated calomel electrode, thereby to remove the nickel ions therefrom.