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:
Apr. 23, 1985
Filed:
Jul. 20, 1983
Applicant:
Inventors:
Yosry A Attia, Columbus, OH (US);
Ted L Tewksbury, Columbus, OH (US);
Assignee:
Battelle Development Corp., Columbus, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B03B / ;
U.S. Cl.
CPC ...
209-3 ; 209 12 ; 209 38 ; 209 39 ; 209 40 ; 2091272 ;
Abstract
A concentrate containing precious metals is produced from a particulate feed material containing particles of various sizes by a size fractionation step, a gravity separation step performed on each size fraction separately, a magnetic separation step and a second gravity separation step. The process is especially intended for separating gold and other metals from so-called 'black sand' placer deposits.