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:
Oct. 27, 1992
Filed:
Mar. 06, 1990
Applicant:
Inventors:
Thomas J Stierman, Santa Rosa, CA (US);
Michael J Virnig, Santa Rosa, CA (US);
Gary A Kordosky, Tucson, AZ (US);
Assignee:
Henkel Research Corporation, Santa Rosa, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
C01G / ;
U.S. Cl.
CPC ...
75743 ; 423 22 ; 521 31 ; 521 32 ;
Abstract
An improved extraction system employing a quaternary amine to extract anions from an aqueous solution, particularly precious metals such as gold or silver from an aqueous alkaline solution. The improvement comprises the use of a weak organic acid (a compound providing an acidic proton) along with the quaternary amine. The improvement is useful in both liquid-liquid and liquid-solid extraction systems.