IP Library › Granted Patent US 5,039,337
Granted Patent Utility
US 5,039,337 · App. 07/559,140

Process for producing electrolytic lead and elemental sulfur from galena

Inventors: Marco Olper, Pierluigi Fracchia
Patented Case View Patent ↗
Granted: Aug 13, 1991 Filed: Jul 30, 1990
Inventors
Marco Olper
Pierluigi Fracchia
Assignee (at issue)
Engitec Impianti S.p.A.

This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.

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Quick Facts
Patent No.
US 5,039,337
App. No.
07/559,140
Filed
1990-07-30
Granted
1991-08-13
Kind
A