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. 12, 1991
Filed:
Oct. 21, 1988
Applicant:
Inventors:
Wilson L Lin, Plymouth, MN (US);
Phillip L Mattison, New Brighton, MN (US);
Michael J Virnig, Fridley, MN (US);
Assignee:
Henkel Corporation, Ambler, PA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B / ; C09K / ;
U.S. Cl.
CPC ...
252184 ; 75723 ; 556 36 ; 423 24 ;
Abstract
Recovery of precious metals such as gold and silver from aqueous cyanide solutions thereof, by contact with a reagent containing a guanidine functionality. The guanidine reagent extracts the precious metal from the aqueous solution which is subsequentily stripped from the guanidine reagent and recovered by conventional methods. Certain novel guanidine compounds suitable for extracting gold and silver are disclosed.
Lin, Wilson. (1991). Recovery of precious metals (U.S. Patent No. 4992200). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4992200
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile