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:
Jul. 19, 1977
Filed:
Apr. 30, 1976
Kurita Water Industries Ltd., Osaka, JA;
Abstract
A method of treating water containing chromate by bringing the water-to-be-treated into contact with ion-exchange resins, which comprises: passing the water-to-be-treated through a bed of weakly acidic cation exchange resin in H-form at first; subsequently passing the same water through a bed of weakly basic anion exchange resin in salt form thereby to remove said chromate from the water; introducing an alkali metal hydroxide solution into said weakly basic anion exchange resin bed in the reverse direction relative to the direction of passing of the water thereby to elute chromate; and further introducing an acid solution therein thereby to convert the weakly basic anion exchange resin into salt form.