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:
Mar. 13, 1979
Filed:
Oct. 05, 1977
Applicant:
Inventors:
Bernd Leutner, Frankenthal, DE;
Gotthard Scizi, Bad Duerkheim, DE;
Siegmar Lukas, Ludwigshafen, DE;
Siegfried Schreiner, Ludwigshafen, DE;
Erfried Voelkl, Frankenthal, DE;
Assignee:
BASF Aktiengesellschaft, Rheinland, Pfalz, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C25B / ;
U.S. Cl.
CPC ...
204 92 ;
Abstract
Concentrated dithionite solutions are produced by cathodic reduction of an aqueous solution, containing sulfite and/or bisulfite, which is circulated by pumping. The cathode and anode chambers are separated from one another by a permselective cation exchanger membrane. The catholyte must be circulated at least 10 times per hour and the selective catholyte volume outside the cell, defined as