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:
Dec. 27, 1994
Filed:
Dec. 28, 1993
Toshikatsu Hamano, Tokyo, JP;
Asahi Glass Company Ltd., Tokyo, JP;
Abstract
A method of making water having a low salt content by desalination comprising the steps of alternately arranging pluralities of cation exchange membranes and monovalent anion selective anion exchange membranes or pluralities of anion exchange membranes and monovalent cation selective cation membranes between electrodes thereby alternately forming pluralities of the diluting cells and concentrating cells of an electrodialysis tank; feeding a salt containing water including hardly soluble salts to the plurality of diluting cells of the electrodialysis tank; feeding electricity to the electrodes; maintaining the salt concentration of the concentrated solution in the plurality of concentrating cells to a value of not less than 700 ppm; and retaining as much as possible the polyvalent anions forming the hardly soluble salts in the salt containing water.