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:
Aug. 24, 1982
Filed:
Mar. 31, 1981
Applicant:
Inventor:
John B Goddard, Grand Island, NY (US);
Assignee:
Union Carbide Corporation, Danbury, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01G / ;
U.S. Cl.
CPC ...
423 56 ; 423 54 ; 423593 ; 2330 / ;
Abstract
Prior to evaporative crystallization of ammonium tungstate solutions to give ammonium paratungstate (APT), an aluminum compound, e.g. aluminum sulfate solution, is added to precipitate silicon and phosphorus impurities. The yield of crystallized ammonium paratungstate is thereby increased.