Granted Patent
Utility
US 4,510,028 · App. 06/508,693
Process for recovering zinc from zinc ferrite material
Inventors:
Gerald L. Bolton, Donald R. Weir
Patented Case
View Patent ↗
Granted: Apr 9, 1985
Filed: Jun 28, 1983
Inventors
Gerald L. Bolton
Donald R. Weir
Assignee (at issue)
Sherritt Gordon Mines Limited
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.