Granted Patent
Utility
US 6,103,204 · App. 08/989,180
Selective bioleaching of zinc
Inventors:
Hector M. Lizama, Robert G. Frew, Cherian C. Abraham
Patented Case
View Patent ↗
Granted: Aug 15, 2000
Filed: Dec 11, 1997
Inventors
Hector M. Lizama
Robert G. Frew
Cherian C. Abraham
Assignee (at issue)
Cominco, Ltd.
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.