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. 18, 1983
Filed:
Dec. 29, 1981
Jitesh R Mehta, Eagan, MN (US);
Francis M Dunlevey, Lake Oswego, OR (US);
GNB Batteries Inc., Mendota Heights, MN (US);
Abstract
A batch process for desilverizing and refining lead bullion containing antimony and a low silver content, including the steps of melting the lead bullion, adding calcium to form a floating silver-rich dross containing a silver-antimony-calcium compound and separating the dross from the desilverized, molten lead bullion. The process further comprises a plurality of successive batch operations wherein silver-rich dross is separated and accumulated in each batch operation for subsequent processing. The successive batch operations are maintained at about 400.degree. C. in order to effect significant savings in energy, time and labor over processes previously used.