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:
Nov. 04, 1980
Filed:
Apr. 05, 1979
Applicant:
Inventor:
Frank Pitts, Magalas, FR;
Assignee:
Engelhard Minerals & Chemicals Corporation, Menlo Park, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01F / ;
U.S. Cl.
CPC ...
423263 ; 423395 ;
Abstract
A process for preparing a rare earth nitrate solution in which rare earth hydroxides containing quadrivalent cerium are dissolved in nitric acid with the addition of hydrogen peroxide. The change in oxidation-reduction E.M.F. may be used to control the addition of peroxide to prevent formation of quadrivalent cerium ions in the nitrate solution.