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:
Apr. 25, 1978
Filed:
Jun. 27, 1977
Applicant:
Inventors:
Bruno Kindl, Kingston, CA;
Jennifer Geraldine Atkinson, Amherstview, CA;
Assignee:
Huron Chemicals Limited, Kingston, CA;
Primary Examiner:
Int. Cl.
CPC ...
C25B / ; C01B / ;
U.S. Cl.
CPC ...
204 95 ; 204 98 ; 204101 ; 204128 ; 210 50 ; 423 55 ; 423511 ; 423571 ; 423607 ;
Abstract
Chromates are removed from aqueous alkali metal chlorate solutions by either of two processes. In the first process, a water-soluble sulfide is added to react with the chromate, and then a ferrous salt is added. The soluble sulfate is converted to elemental sulfur and the chromate is converted to an insoluble trivalent Cr-containing material which is removed from solution. In the second process an 'iron mud' is prepared by reacting a ferrous salt with sodium hydroxide and added so as to precipitate insoluble trivalent chromium-containing material.