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:
Feb. 22, 1983
Filed:
Jun. 01, 1981
Applicant:
Inventors:
Samuel Natansohn, Sharon, MA (US);
Gary Czupryna, Salem, MA (US);
Assignee:
GTE Laboratories Incorporated, Waltham, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C25C / ; C25C / ;
U.S. Cl.
CPC ...
204109 ; 204106 ; 204112 ;
Abstract
A process for cleanly separating tungsten and the coinage metals from alloys or mixtures thereof comprises electrowinning the coinage metal from an electrolyte solution which is maintained substantially free of tungsten contamination by contacting the electrolyte solution with an organic extractant to remove the tungsten. A preferred extractant solution comprises a quaternary alkyl ammonium salt or quaternary alkyl phosphonium salt dissolved in an inert organic solvent.