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:
May. 04, 1993
Filed:
Mar. 11, 1991
Applicant:
Inventor:
Donald J Butterworth, Stirling, NJ (US);
Assignee:
The Graver Company, Union, NJ (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
2041824 ; 204 98 ; 204103 ; 2041825 ; 204301 ;
Abstract
A method and bipolar membrane stack for the generation of acid and base solutions from a salt by electrodialysis. The unit cells of the stack comprise a novel arrangement of membranes which provide four liquid flow channels. One of the channels has circulating therein a multivalent acid solution which acts as a buffer and presents leakage of the salt anion through the bipolar membrane, thereby producing base solution of substantially reduced salt-anion contamination. The method can be operated on a continuous basis.