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:
May. 21, 1985
Filed:
Jun. 10, 1983
Archibald W Fletcher, Tucson, AZ (US);
Charles d'A Hunt, Occidental, CA (US);
Duval Corporation, Houston, TX (US);
Abstract
It has been discovered that suprisingly effective removal of impurities from copper can be achieved using electron beam distillation, especially with respect to relatively low amounts of impurities such as Ag, Se, Te, S, Bi and Pb. Certain pretreatments of unrefined metal prior to electron beam irradiation significantly improve overall results. These include iron and/or oxygen removal treatments. In a particularly advantageous embodiment, these impurity removal treatments and combinations thereof are achieved in conjunction with a new method of electron beam distillation of metals which involves a horizontal multistage system with recycle of the condensed vapor phases.